RT，代码：

#include <iostream>
#include <vector>
#include <cmath>
using namespace::std;
vector<long long>v;
int main(){
    long long n , m , ret = 0 ;
    cin >> n >> m;
    long long s[10000];
    for(long long i = 0;i <= n;++i){
        if(i==n)v.push_back(0);
        else{
            cin >> s[i];
            v.push_back(0);
        }
    }
    for(;v[n-1]!=s[n-1];){
        for(long long i = 0;i < m;++i){
            if(v[i] < s[i]){
                v[i]++;
            }
            else{
                v.erase(v.begin()+i);
                v[m-1]++;
            }
        }
        ret++;
    }
    cout << ret << endl;
    return 0;
}

如果有大佬看到，请AT我，谢谢