求助cpp 为什么dev里能正常运行，洛谷提交报错，样例全过!

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

long long n, a, b, c, ans = 2100000000, x;
int main() {
	cin >> n;
	for (int i = 0; i < 3; i++) {
		cin >> a >> b;
		x = ceil(n * 1.0 / a) * b;
		ans = min(x, ans);
	}

	cout << ans;
	return 0;
}

LUOGU提交后出现的

编译失败
/tmp/compiler_fsij8xww/src:30:9: 错误：expected unqualified-id before ‘return’
   30 |         return 0;
      |         ^~~~~~
/tmp/compiler_fsij8xww/src:31:1: 错误：expected declaration before ‘}’ token
   31 | }
      | ^