Submission #290867

#	Time	Username	Problem	Language	Result	Execution time	Memory
290867		crossing0ver	W (RMI18_w)	C++17	0 / 100	97 ms	5368 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);
	int a[2] = {};
	int c= 0,ans = 1;
	for (int i = 1; i <= 1000000; i++) {
		if (cnt[i]) {
			c++;
			ans*=cnt[i] - 1;
		}
	}
	cout << ans*(c/2);
		

}

Compilation message (stderr)

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:21:6: warning: unused variable 'a' [-Wunused-variable]
   21 |  int a[2] = {};
      |      ^

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