poj 3427 Ecology tax

#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>#include <algorithm>using namespace std;#define maxn 30005int n, m;int f[maxn], sum[maxn];int main(){    scanf("%d%d", &n, &m);    for (int i = 1; i <= n; i++)        scanf("%d", &f[i]);    for (int i = 1; i <= n; i++)        f[i] = f[i] % m;    int ans = 0;    for (int i = 1; i <= n; i++)        if (f[i] != 0) ans = max(ans, m - f[i]);    printf("%dn", ans);    return 0;}