The purpose of the program is to create a random list of 1000 numbers in an array, sort that array, then find the greatest set of numbers within (x, x+50). The program successfully generates and sorts the numbers within the array, but crashes when the (i, j) set finding algorithm starts. The program generates no errors on compiling, and I'm sure the error is simple, but for the life of me I can't find the issue. Thanks in advance you amazing people!
int main( ){
int a, b, temp, i, j, x, y, tempTotal, arrayStartMax;
int finalTotal = 0;
int *info[ARRAY_FULL];
for (i=0; i<ARRAY_FULL; i++){
info[i]=(int*)malloc(sizeof(int));
*info[i]=rand()%1000;
}
for (a = 0; a < ARRAY_FULL; ++a){
for (b = a + 1; b < ARRAY_FULL; ++b){
if (*info[a] > *info[b]){
temp = *info[a];
*info[a] = *info[b];
*info[b] = temp;
}
}
}
for (i=0; i<ARRAY_FULL; i++){
printf("%d\n", *info[i]);
}
for (i = 0; i <= ARRAY_HALF; i++){
x = *info[i];
y = x+ARRAY_HALF;
tempTotal = 0;
for (j = i; j < i+ARRAY_HALF; i++){
if (*info[j] >= x || *info[j] <= y) {
tempTotal++;
}
if (tempTotal > finalTotal) {
arrayStartMax = *info[i];
finalTotal = tempTotal;
}
}
}
printf("Interval should start at %d for maximum numbers in a set.", arrayStartMax);
}
For the purpose of this program I would like to mention that ARRAY_FULL = 100 and ARRAY_HALF = 50.
Your code is throwing segfault because you're walking i out of bounds in this for loop.
for (j = i; j < i+ARRAY_HALF; i++){
if (*info[j] >= x || *info[j] <= y) {
tempTotal++;
}
if (tempTotal > finalTotal) {
arrayStartMax = *info[i];
finalTotal = tempTotal;
}
You set j = i then increment i prior to the comparison. So j will always be less than i.
Limit i in the comparison section of the for loop and it won't segfault.
I don't think the comparison is doing what you want, but you should be able to find your way home from here.
Related
How do I make my code more efficient (in time) pertaining to a competitive coding question (source: codechef starters 73 div 4):
(Problem) Chef has an array A of length N. Chef wants to append a non-negative integer X to the array A such that the bitwise OR of the entire array becomes = Y .
Determine the minimum possible value of X. If no possible value of X exists, output -1.
Input Format
The first line contains a single integer T — the number of test cases. Then the test cases follow.
The first line of each test case contains two integers N and Y — the size of the array A and final bitwise OR of the array A.
The second line of each test case contains N space-separated integers A_1, A_2, ..., A_N denoting the array A.
Please don't judge me for my choice of language .
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int* binary_number(int n) // returns pointer to a array of length 20(based on given constrains) representing binary
{
int* ptc;
ptc = (int*) malloc(20*sizeof(int));
for(int i = 0; i < 20; i++)
{
if((n / (int) pow(2,19-i)) > 0){*(ptc + i) = 1;}
else {*(ptc + i) = 0;}
n = n % (int) pow(2,19-i) ;
}
return ptc;
}
int or_value(int* ptc, int n) // Takes in pointers containing 1 or zero and gives the logical OR
{
for(int k = 0; k < n; n++)
{
if(*ptc == *(ptc + 20*k)){continue;} // pointers are 20 units apart
else{return 1;break;}
}
return *ptc;
}
int main(void) {
int t; scanf("%d", &t);
for (int i = 0; i < t; i++)
{
int n, y;
scanf("%d %d", &n, &y);
int a[n];
for(int j = 0; j < n ; j++)
{
scanf("%d", &a[j]);
}
int b[20*n];
for (int j = 0; j < n; j++)
{
for (int k = 0; k < 20; k++)
{
b[20*j + k] = *(binary_number(a[n])+k);
}
}
int c = 0;
int p = 0;
for (int j = 0; j < 20; j++)
{
if ((*(binary_number(y) + j) == 1) && (or_value((&b[0] + j),n) == 0)){c = c + pow(2,19 - j);}
else if ((*(binary_number(y) + j) == 0) && (or_value((&b[0] + j),n) == 1)){p = 1; break;}
}
if (p==1){printf("-1");}
else {printf("%d\n", c);}
}
return 0;
}
I'm trying to make a program using C lang to calculate the given two numbers, A and B, how many numbers from A to B, inclusive, are divisible by another number K. For example, if A is 1, B is 10, and K is 3, then there are 3 numbers that satisfy this: 3, 6, and 9.
when trying to debug it in online compiler i get this error:
Program received signal SIGFPE, Arithmetic exception.
0x00005555555553fd in main () at main.c:346
346 int temp = j % newArr[j][2];
is there anything wrong in the modulo?
this is my current my attempt. i've tried this injs and it works, but not in C
int main(void)
{
int arr[] = {100,16,9905,8,7346,...,301n]
//the input is array 0f 301 integers, which the
first element is just the number of test case
int newArr[100][3];
int no = 1;
int result = 0;
int x, y, i, j;
int start, end;
for (x = 0; x < 100; x++)
{
for (y = 0; y < 3; y++)
{
newArr[x][y] = arr[no];
no += 1;
}
}
for (i = 0; i < 100; i++)
{
if (newArr[i][0] < newArr[i][1])
{
start = newArr[i][0];
end = newArr[i][1];
}
else
{
start = newArr[i][1];
end = newArr[i][0];
}
for (j = start; j <= end; j++)
{
int temp = j % newArr[j][2];
if ( temp == 0)
{
result += 1;
}
printf(" %d result %d\n",i, result);
}
printf("case %d : %d \n", i, result);
result = 0;
}
return 0;
}
thanks in advance!
There is no technical issue here: you have mixed up i and j
int temp = j % newArr[j][2];
should become
int temp = j % newArr[i][2];
I have puzzles that looks like this:
=== ====
=== ===
=== ====
left edge has length from 0 to 10 000 and right also, middle part is from 1 to 10 000.
So the question is if i can build a rectangle? like first puzzle has length of left edge equal to 0 and the last puzzle has right edge of length 0 and in the middle they fit perfectly?
I am given the number of puzzle i have and their params like this:
6
1 9 2
0 3 1
0 4 1
8 9 0
2 9 0
1 5 0
and result can be any of that:
2
0 3 1
1 5 0
or
3
0 3 1
1 9 2
2 9 0
or
2
0 4 1
1 5 0
But if there is no result i have to printf("no result")
I have to do this in C, I thought about doing some tree and searching it with BFS where vertices would have edge lengths and edge would have middle length and when reached 0 i would go all way up and collect numbers but it's hard to code. So i decided to do recursion but im also stuck:
#include<stdio.h>
int main(){
int a;
scanf("%d", &a);//here i get how many puzzles i have
int tab[a][3];//array for puzzles
int result[][3];//result array
int k = 0;//this will help me track how many puzzles has my result array
for(int i = 0; i < a; i++){//upload puzzles to array
for(int j = 0; j < 3; j++){
scanf("%d", &tab[i][j]);
}
}
findx(0, a, tab, result, k);//start of recursion, because start has to be length 0
}
int findx(int x, int a, int *tab[], int *result[], int k){//i am looking for puzzle with length x on start
for(int i = 0; i < a; i++){
if(tab[a][0] == x){//there i look for puzzles with x length at start
if(tab[a][2] == 0){//if i find such puzzle i check if this is puzzle with edge length zero at the end
for(int m = 0; m < 3; m++){//this for loop add to my result array last puzzle
result[k][m] = tab[a][m];
}
return print_result(result, k);//we will return result go to print_result function
}
else{//if i have puzzle with x length on the left and this is not puzzle which ends rectangle i add this puzzle
//to my result array and again look for puzzle with x equal to end length of puzzle i found there
for(int m = 0; m < 3; m++){
result[k][m] = tab[a][m];
k += 1;
}
findx(tab[a][2], a, tab, result, k);
}
}
}
printf("no result");
}
int print_result(int *result[], int k){
printf("%d", &k);//how many puzzles i have
printf("\n");
for(int i = 0; i < k; i++){//printing puzzles...
for(int j = 0; j < 3; j++){
printf("%d ", &result[i][j]);
}
printf("\n");//...in separate lines
}
}
I have an error that result array can't look like this int result[][3] because of of [] but I don't know how many puzzles I'm gonna use so?... and I have implicit declaration for both of my functions. Guys please help, I dont know much about C and its super hard to solve this problem.
I'm not sure I understand the overall logic of the problem, but you definitely are in need of some variable sized containers for result AND tab. Arrays are fixed size and must be defined at compile time. The following should at least compile without warnings:
#include<stdio.h>
#include<stdlib.h>
void print_result(int (*result)[3], int k){
printf("%d", k);//how many puzzles i have
printf("\n");
for(int i = 0; i <= k; i++){//printing puzzles...
for(int j = 0; j < 3; j++){
printf("%d ", result[i][j]);
}
printf("\n");//...in separate lines
}
}
void findx(int x, int a, int (*tab)[3], int (*result)[3], int k){//i am looking for puzzle with length x on start
for(int i = 0; i < a; i++){
if(tab[i][0] == x){//there i look for puzzles with x length at start
if(tab[i][2] == 0){//if i find such puzzle i check if this is puzzle with edge length zero at the end
for(int m = 0; m < 3; m++){//this for loop add to my result array last puzzle
result[k][m] = tab[i][m];
}
print_result(result, k);//we will return result go to print_result function
return;
}
else{//if i have puzzle with x length on the left and this is not puzzle which ends rectangle i add this puzzle
//to my result array and again look for puzzle with x equal to end length of puzzle i found there
for(int m = 0; m < 3; m++){
result[k][m] = tab[i][m];
k += 1;
///** Increase size of result **/
//int (*newptr)[3] = realloc(result, (k+1) * sizeof(int[3]));
//if (newptr)
// result = newptr;
}
findx(tab[i][2], a, tab, result, k);
}
}
}
printf("no result\n");
}
int main(){
int a;
scanf("%d", &a);//here i get how many puzzles i have
int (*tab)[3] = malloc(a * sizeof(int[3]));//array for puzzles
int (*result)[3] = malloc(a * sizeof(int[3]));//array for puzzles
int k = 0;//this will help me track how many puzzles has my result array
for(int i = 0; i < a; i++){//upload puzzles to array
for(int j = 0; j < 3; j++){
scanf("%d", &tab[i][j]);
}
}
findx(0, a, tab, result, k);//start of recursion, because start has to be length 0
}
Note that I changed the tab and result types to (*int)[3]. Due to order of operations, we need parentheses here. Because they are variable size, they require dynamic memory allocations. In the interest of brevity and readability, I did not check the returned values of malloc or realloc. In practice, you should be checking that the returned pointer is not NULL. Because we are using dynamic memory allocations, we should also use free if you plan on doing anything else with this program. Otherwise, it doesn't really matter because exiting the program will free the resources anyway. You actually don't want to free. because we are passing a pointer by value to findx and the realloc can change the address, it may come back with a different address. Also, take note that I needed to include <stdlib.h> for the dynamic memory allocations.
Additional Issues
Your functions print_results and findx are not declared when you call them in main. Your function either need to be above main or have "function prototypes" above main.
In the printfs you do not need the &. You do not want to send the address of the variable to printf. You want to send what will actually be printed.
Now what?
The program still does not provide you with the correct results. It simply outputs 0 as the result every time. This should at least give you a starting point. By changing this line in print_results:
for(int i = 0; i < k; i++){//printing puzzles...
to
for(int i = 0; i <= k; i++){//printing puzzles...
I was at least able to output 0 0 0. This seems more correct because if k is 0, we don't loop at all.
#include<stdio.h>
void findx(int x, int a, int tab[a][3], int result[200000][3], int puzzlesinresult) { //i am looking for puzzle with length x on start
for (int i = 0; i < a; i++) {
if (tab[i][0] == x) { //there i look for puzzles with x length at start
if (tab[i][2] == 0) { //if i find such puzzle i check if this is puzzle with edge length zero at the end
for (int m = 0; m < 3; m++) { //this for loop add to my result array last puzzle
result[puzzlesinresult][m] = tab[i][m];
}
return print_result(result, puzzlesinresult); //we will return result go to print_result function
} else { //if i have puzzle with x length on the left and this is not puzzle which ends rectangle i add this puzzle
//to my result array and again look for puzzle with x equal to end length of puzzle i found there
while (result[puzzlesinresult - 1][2] != tab[i][0] && puzzlesinresult > 0) {
puzzlesinresult -= 1;
}
int isusedpuzzle = 0;
for (int j = 0; j < puzzlesinresult; j++) {
if (result[j][0] == tab[i][0] && result[j][1] == tab[i][1] && result[j][2] == tab[i][2]) {
isusedpuzzle = 1;
} else {
//pass
}
}
if (isusedpuzzle == 0) {
for (int m = 0; m < 3; m++) {
result[puzzlesinresult][m] = tab[i][m];
}
puzzlesinresult += 1;
findx(tab[i][2], a, tab, result, puzzlesinresult);
}
}
}
}
}
void print_result(int result[200000][3], int puzzlesinresult) {
printf("%d\n", puzzlesinresult + 1); //how many puzzles i have
for (int i = 0; i < puzzlesinresult + 1; i++) { //printing puzzles...
for (int j = 0; j < 3; j++) {
printf("%d ", result[i][j]);
}
printf("\n"); //...in separate lines
}
exit(0);
}
int main() {
int a;
scanf("%d", & a); //here i get how many puzzles i have
int tab[a][3]; //array for puzzles
int result[100][3]; //result array
int puzzlesinresult = 0; //this will help me track how many puzzles has my result array
for (int i = 0; i < a; i++) { //upload puzzles to array
for (int j = 0; j < 3; j++) {
scanf("%d", & tab[i][j]);
}
}
for (int i = 0; i < a; i++) { //here i delete puzzles that doesnt contribute anything like 1 x 1,2 x 2,..
if (tab[i][0] == tab[i][2] && tab[i][0] != 0) {
for (int p = i; p < a; p++) {
for (int j = 0; j < 3; j++) {
tab[p][j] = tab[p + 1][j];
}
}
}
}
findx(0, a, tab, result, puzzlesinresult); //start of recursion, because start has to be length 0
printf("NONE");
}
This returns sometimes correct result. If you can find when this program fails I would rly appreciate sharing those cases with me :)
I'm trying to develop a code to solve the Travelling salesman problem in C, but I have some restrictions: I can only use "for, "while", "do", arrays, matrix and simple things like that, so, no functions or recursion (unfortunately).
What I've got so far:
The user will will type the city coordinates X and Y like this:
8.15 1.58
9.06 9.71
1.27 9.57
9.13 4.85
The code to storage the coordinates.
float city[4][2];
int i;
for (i=0; i<4; i++)
scanf("%f %f", &cidade[i][0], &cidade[i][1]);
There are 4 cities, so "i" goes from 0 to 3. X and Y are storaged on the second dimension of the matrix, [0] and [1].
The problem now is that I have to generate ALL POSSIBLE permutations of the first dimension of the matrix. It seems easy with just 4 cities, because all possible routes are (it must starts with city A everytime):
A B C D
A B D C
A C B D
A C D B
A D C B
A D B C
But I'll have to expand it for 10 cities. People have told me that it will use 9 nested foor loops, but I'm not being able to develop it =(
Can somebody give me an idea?
Extending to 10 (and looking up city names) as an exercise for the reader. And it's horrid, but that's what you get with your professor's limitations
#include <stdio.h>
int main(void) {
for (int one = 0; one < 4; one++) {
for (int two = 0; two < 4; two++) {
if (two != one) {
for (int three = 0; three < 4; three++) {
if (one != three && two != three) {
for (int four = 0; four < 4; four++)
if (one != four && two != four && three != four) {
printf("%d %d %d %d\n", one, two, three, four);
}
}
}
}
}
}
return 0;
}
This is based on https://stackoverflow.com/a/3928241/5264491
#include <stdio.h>
int main(void)
{
enum { num_perm = 10 };
int perm[num_perm];
int i;
for (i = 0; i < num_perm; i++) {
perm[i] = i;
}
for (;;) {
int j, k, l, tmp;
for (i = 0; i < num_perm; i++) {
printf("%d%c", perm[i],
(i == num_perm - 1 ? '\n' : ' '));
}
/*
* Find largest j such that perm[j] < perm[j+1].
* Break if no such j.
*/
j = num_perm;
for (i = 0; i < num_perm - 1; i++) {
if (perm[i + 1] > perm[i]) {
j = i;
}
}
if (j == num_perm) {
break;
}
for (i = j + 1; i < num_perm; i++) {
if (perm[i] > perm[j]) {
l = i;
}
}
tmp = perm[j];
perm[j] = perm[l];
perm[l] = tmp;
/* reverse j+1 to end */
k = (num_perm - 1 - j) / 2; /* pairs to swap */
for (i = 0; i < k; i++) {
tmp = perm[j + 1 + i];
perm[j + 1 + i] = perm[num_perm - 1 - i];
perm[num_perm - 1 - i] = tmp;
}
}
return 0;
}
In the program that I'm writing, I currently have a for-loop that goes through an array, num[5], and checks to see if there are any 1's in that array, which looks like:
int counter = 0;
for (int i = 1; i <= 5; i++)
if (num[i] == 1)
counter++;
This works successfully, but I'm now trying to go through the array and see what the indices of the 1's in the program are. So, if I have 01001, I want to make an array that holds the positions of the 1's. The following is what I've tried so far:
int b[counter];
for (int k = 0; k <= counter; k++) {
for (i = 0; i <= 5; i++) {
if (num[i] == 1) {
b[k] = i;
}
}
}
but this doesn't produce the desired result. When I type the string in, say 1001, I get 444. Can someone tell me what I'm doing incorrectly?
For each value of k, for each occurrence of a 1, you're setting b[k] to the index of the 1. Thus each b[k] will have the index of the last 1.
Try:
int b[counter];
int k = 0;
for (i = 0; i <= 5; i++) {
if (num[i] == 1) {
b[k++] = i;
}
}
So, whenever it gets a 1, it assigns b[k] to the index and then increases k.
Then you should also use k, not counter, when trying to print out b.
The problem lies in this part of your code.
int b[counter];
for (int k = 0; k <= counter; k++) {
**for (i = 0; i <= 5; i++) {
if (num[i] == 1) {
b[k] = i;
}**
}
}
Suppose you get a 1 at the index 1 of the array as in 01001. You assign b[k] = 1;
This is perfectly valid. But as the loop continues you get another 1 at the index 4. Thus the command b[k] = 4; is again executed.
Note that your value of k is constant in both the statements and hence you get the array b as 44.
So what you need to do is break the inner for loop as soon as you get a 1.
Here is the modified code. You also need to keep a track of the iterator i and I have done that here using the variable- new_pos // new position.
int b[counter];
int new_pos=0; //to keep track of the iterator
for (int k = 0; k <= counter; k++) {
for (i = new_pos; i <= 5; i++) {
if (num[i] == 1) {
b[k] = i;
new_pos = i+1;
break;
}
}
}
The code provided by Dukeling is also perfect, but I am just giving another way to make your own code work.