CodeForces 589I Lottery (暴力，水题)

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include <cstdio>
#include <string>
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <cstring>
#include <set>
#include <queue>
#include <algorithm>
#include <vector>
#include <map>
#include <cctype>
#include <stack>
using namespace std ;

typedef long long LL;
typedef pair<int, int> P;
const int INF = 0x3f3f3f3f;
const double inf = 0x3f3f3f3f3f3f;
const double PI = acos(-1.0);
const double eps = 1e-8;
const int maxn = 10 + 5;
const int mod = 1e9 + 7;
const char *mark = "+-*";
const int dr[] = {0, 0, -1, 1};
const int dc[] = {-1, 1, 0, 0};
int n, m;
inline bool is_in(int r, int c){
    return r >= 0 && r < n && c >= 0 && c < m;
}
int a[105];

int main(){
    while(scanf("%d %d", &n, &m) == 2){
        memset(a, 0, sizeof(a));
        for(int i = 0; i < n; ++i){
            int x;
            scanf("%d", &x);
            ++a[x];
        }
        int x = n / m;
        int ans = 0;
        for(int i = 1; i <= m; ++i)
            ans += abs(x-a[i]);
        printf("%d\n",ans/2);
    }
    return 0;
}