Submission #64037368

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Source Code Expand

#include<bits/stdc++.h>
//#include <atcoder/all>

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

using namespace std;
//using namespace atcoder;

typedef long long ll;
typedef unsigned long long ull;

#define rep(i,N) for(int i=0;i<(N);++i)
#define rrep(i,N) for(int i=(N)-1;i>=0;--i)
#define all(A) A.begin(),A.end()

using vvi = vector<vector<int>>;
using P = pair<int,int>;

template<class T>bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }
template<class T=bool> void YesNo(T flg){ cout << (flg? "Yes\n" : "No\n"); }

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    map<int,int> mp,ans;
    int N;cin >> N;
    rep(i,N){
        int A;cin >> A;
        mp[A]++;
        chmax(ans[A],i+1);
    }
    int val=-1;
    for(const auto& [A,cnt] : mp){
        if(cnt>1) continue;
        val=ans[A];
    }
    cout << val << endl;
    return 0;
}

Submission Info

Judge Result