繁华模拟赛 ljw搭积木

#include<iostream>
#include<cstdio>
#include<string>
#include<cstring>
#include<algorithm>
using namespace std;
const int maxn = 6005;
int n,x[maxn];
int cmd,cnt,ans,max_x;
int main(){
    freopen("box.in","r",stdin);
    freopen("box.out","w",stdout);
    ios::sync_with_stdio(false);
    cin>>n;
    for(int i = 1;i <= n;i++){
        cin>>cmd;
        x[cmd]++;
        max_x = max(max_x,cmd);
    }
    while(1){
        cnt = 0;
        for(int i = 0;i <= max_x;i++){
            while(x[i] && i >= cnt){
                x[i]--;
                cnt++;
            }
        }
        if(!cnt) break;
        ans += 1;
    }
    cout<<ans;
    return 0;
}