Submission #485551

#	Time	Username	Problem	Language	Result	Execution time	Memory
485551		sonho00	지우개 (GA4_eraser)	C++17	0 / 100	16 ms	3788 KiB

eraser

#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];
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 16
• Subtask 4: 0 / 17
• Subtask 5: 0 / 26
• Subtask 6: 0 / 28