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#include <cstdio>
main() {
        int t;scanf("%d",&t);
        while (t--) {
                int n,m;scanf("%d%d",&n,&m);
                int a[n],i,l,p;
                long long sum = 0;
                for (i = 0; i < n; i++) {
                        scanf("%d",&a[i]);
                        sum = sum + a[i];
                }
                l = sum / n;
                p = sum % n;
                for (i = 0; i < n; i++) {
                        if (a[i] < l) {
                                a[i] = l - a[i];
                                k = k - a[i];
                        }
                }
                std::sort(a,a+n);
                for (i = 0; p != 0; i++) {
                        a[i] = a[i] + 1;
                        p--;
                }
                std::sort(a,a+n);
                printf("%d\n",a[0]);
        }
        return 0;
}
 

prog.cpp:2:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type]
 main() {
      ^
prog.cpp: In function ‘int main()’:
prog.cpp:17:33: error: ‘k’ was not declared in this scope
                                 k = k - a[i];
                                 ^
prog.cpp:20:17: error: ‘sort’ is not a member of ‘std’
                 std::sort(a,a+n);
                 ^
prog.cpp:25:17: error: ‘sort’ is not a member of ‘std’
                 std::sort(a,a+n);
                 ^

Standard output is empty