제출 #485551

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
485551	2021-11-08 08:23:28	sonho00	지우개 (GA4_eraser)	C++17	0 / 100	16 ms	3788 KiB

eraser

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#include<bits/stdc++.h>
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
using namespace std;
using ll=long long;
using ld=long double;
const ll MOD=1e9+7;
const ll MAX=1e5;
ll n;
ll dp[MAX+5][4];
int main(){
    cin.tie(0)->sync_with_stdio(0);
    cin>>n;
    for(int i=0; i<n; ++i){
        ll a;
        cin>>a;
        dp[a][1]=(dp[a][1]+a)%MOD;
    }
    for(int i=1; i<=MAX; ++i){
        for(int j=2; j<=3; ++j){
            dp[i][j]=(dp[i-1][j]+dp[i-1][j-1]*dp[i][1])%MOD;
        }
    }
    cout<<dp[MAX][3];
}
 
 
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