I am troubleshooting the following code for the Puzzle “Temperatures” related to finding temperatures closest to zero. Programming in C, I have tested it dozens of times on three different IDEs (Code::Blocks, Dev-C++, and CLion), all of which work perfectly. However, when I run in the CodinGame IDE, it produces an error. Specifically, it sends the value 1 to stdout instead of the expected correct value closest to zero. The strategy I used was to place the scanf() temperatures into an array of size n, order them by the absolute value (abs()) of the number, and printf() the value in the first index of the ordered array. Some simple program control at the end deals with the case of selecting positive over negative values when their absolute values are equal (e.g., if selecting between -5 and 5, choose 5). Does CodinGame not accept arrays or pointers?
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
// User defined function prototype
void swap(int *xp, int *yp);
int main()
{
int n; // the number of temperatures to analyse
int temp[n]; // Declare an array of size n
scanf("%d", &n); // System reads size
for (int i = 0; i < n; i++)
{
int t;
temp[i] = scanf("%d", &t); //<-- inputs scanf() into an array
}
int j, i, min_idx;
for ( i = 0; i < n-1; i++ )
{
min_idx = i;
for ( j = i+1; j < n; j++ )
{
if ( abs(temp[j]) < abs(temp[min_idx]) )
{
min_idx = j;
}
}
// User defined function to swap array elements
swap(&temp[min_idx], &temp[i]);
}
// Program control to deal with 5 or -5
if ( abs(temp[0]) == abs(temp[1]) && temp[1] > temp[0] )
{
printf("%d\n", temp[1]);
}
else
printf("%d\n", temp[0]);
return 0;
}
/*swap() -- user defined function that swaps values from an array. */
void swap(int *xp, int *yp)
{
int temp = *xp;
*xp = *yp;
*yp = temp;
}