第一个AC了，第二个全Wonderful Answer了

#include<bits/stdc++.h>
using namespace std;
int n, m;
const int N = 1e4 + 911;
int a[N];
int j;
int ans = 0; 
int main() {
	cin >> n >> m;
	for(int i = 1; i <= n; i++) 
		cin >> a[i];
	j = m + 1;
	while(j <= n + m) {
		for(int i = 1; i <= m; i++) {
			--a[i];
			if(a[i] == 0) {
				a[i] = a[j];
				j++;
			}
			
		}
		ans++;
	}
	cout << ans;
	return 0;
}
	//全过
#include<bits/stdc++.h>
using namespace std;
int n, m;
const int N = 1e4 + 911;
int a[N];
int j;
int ans = 0; 
int main() {
	cin >> n >> m;
	for(int i = 1; i <= n; i++) 
		cin >> a[i];
	j = m + 1;
	while(j <= n + m) {
		for(int i = 1; i <= m; i++) {
			
			if(a[i] == 0) {
				a[i] = a[j];
				j++;
			}
			--a[i];
		}
		ans++;
	}
	cout << ans;
	return 0;
}
	//全错