제출 #290879

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
290879		crossing0ver	W (RMI18_w)	C++17	10 / 100	72 ms	5496 KiB

w

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define vi vector<int>
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
using namespace std;
int cnt[1000005],arr[300005];
main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	for (int i = 0; i< n; i++) {
		cin >> arr[i];
		cnt[arr[i]]++;
	}
	sort(arr,arr+n);
	reverse(arr,arr+n);
	if (arr[n-1] == arr[0]) {
		cout << 0;
		return 0;
	}
	for (int i = 1; i < n; i++) {
		if (arr[i] != arr[i-1]) {
			ll left = i;
			ll right = n - left;
			if (left < 3 || right < 2) {
				cout << 0;
				return 0;
			}
			ll ans = 0;
			for (int i = 1; i <= left - 2; i++)
				ans += (left - i - 1);
			ans *= right - 1;
			cout << ans;
			return 0;
			
			
			
			
		}
	}
	int a[2] = {};
	int c= 0;
	ll ans = 1;
	for (int i = 1; i <= 1000000; i++) {
		if (cnt[i]) {
			c++;
			ans*=(cnt[i] - 1);
		}
	}
	cout << ans*(c/2);
		

}

컴파일 시 표준 에러 (stderr) 메시지

w.cpp:11:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   11 | main() {
      |      ^
w.cpp: In function 'int main()':
w.cpp:46:6: warning: unused variable 'a' [-Wunused-variable]
   46 |  int a[2] = {};
      |      ^

• Subtask 1: 10 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50