제출 #906440

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
906440		Ludissey	Fancy Fence (CEOI20_fancyfence)	C++14	30 / 100	28 ms	1884 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;
#define int long long
 
int n,m;
int mod=1e9+7;
int MOD(int x) {
    return (x+mod)%mod;
}
int clc(int x, int y) {
    x=MOD(x);
    y=MOD(y); 
    return (((((x*(x+1)))/(long long)2)%mod)*((((y*(y+1)))/(long long)2)%mod))%mod; //non cest bon 
}
signed main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);
    cin >> n;
    vector<int> h(n+1);
    vector<int> w(n+1);
    int totalw=0;
    for (int i = 1; i <= n; i++) cin>>h[i];
    for (int i = 1; i <= n; i++) { cin >> w[i]; totalw=(totalw+w[i])%mod; }
    int outp=0;
    h[0]=0;
    for (int i = 1; i <= n; i++)
    {
        // la formule elle marche je suis sur
        // non non juste 5 oui ou 4 sur cms
        //repete
        int side1=clc(totalw,h[i])-clc(totalw,h[i-1]);
        side1=MOD(side1); // 
        outp=MOD(outp+side1); //jai pas compris
        totalw-=w[i];
    }
    cout << outp << "\n";
    return 0;
}

• Subtask 1: 0 / 0
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• Subtask 3: 0 / 13
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
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• Subtask 7: 0 / 27