Codeforces Round #415 (Div. 2) A. Straight «A»

这次竟然在夜里两点多才开，熬不到。。。。
暴力水过

#include <cstdio>#include <cstring>int n,k;float sum;int mark;bool check(int cnt){    int score = (int)(sum/(cnt+n)+0.5);    if(score == k)        return true;    return false;}int main(){    scanf("%d %d",&n,&k);    for(int i = 0; i < n; ++i)    {        scanf("%d",&mark);        sum += mark;    }    int cnt = 0;    while(!check(cnt))    {        ++cnt;        sum += k;    }    printf("%d\n",cnt);    return 0;}