我大概看了一下发现

if(n + (n  - (week * 7)) == 6) week += 0.5;
if(n + (n  - (week * 7)) == 7) week += 1;

↑这的应该是x + (n - (week * 7),But 改了错的更多

#include <bits/stdc++.h>
using namespace std;

int x,n;
int main(){
	cin >> x >> n;
	int week = floor(n/7);
	if(n + (n  - (week * 7)) == 6) week += 0.5;
	if(n + (n  - (week * 7)) == 7) week += 1;
	int hoilday = week * 2;
	int workday = n - hoilday;
	cout << workday * 250 << endl;
}