提出 #70432357

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ソースコード 拡げる

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
#define ff first
#define ss second
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define pii pair<int,int>
#define Fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const int MOD = 1000000007;
const int INF = 1e18;
const int N = 2e5;
/*
    total pairs nC3 - 
    # all same (freq[x] C 3)
    # all different 
    
*/
int xc2(int x){
    if(x < 2)return 0;
    int res = x * (x - 1) / 2;
    return res;
}
void solve(int tc) {
    int n; cin >> n;
    int sum = 0;
    map<int,int>mp;
    for(int i=0;i<n;i++){
        int x; cin >> x;
        mp[x]++;
    }
    for(auto it : mp){
        sum += xc2(it.ss);
    }
    int ans = 0;
    for(auto it : mp){
        ans += it.ss * (sum - xc2(it.ss));
    }
    cout << ans << endl;
}
int32_t main() {
    Fast
    int t = 1;
    // cin >> t;
    for (int tc = 1; tc <= t; tc++)
        solve(tc);
    return 0;
}

提出情報

コンパイルエラー

Main.cpp: In function ‘void solve(long long int)’:
Main.cpp:26:16: warning: unused parameter ‘tc’ [-Wunused-parameter]
   26 | void solve(int tc) {
      |                ^

ジャッジ結果