Submission #1062075

#	Time	Username	Problem	Language	Result	Execution time	Memory
1062075		Jarif_Rahman	Flooding Wall (BOI24_wall)	C++17	8 / 100	245 ms	428 KiB

Main

#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

const ll md = 1e9+7;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n; cin >> n;
    vector<ll> A(n), B(n);
    for(ll &x: A) cin >> x;
    for(ll &x: B) cin >> x;

    ll ans = 0;
    for(int k = 0; k < (1<<n); k++){
        vector<ll> C(n);
        ll cur = 0;
        for(int i = 0; i < n; i++){
            if(k&(1<<i)) C[i] = B[i];
            else C[i] = A[i];
            cur-=C[i], cur%=md;
        }
        vector<ll> suff(n, 0);
        for(int i = n-1; i >= 0; i--){
            if(i+1 < n) suff[i] = suff[i+1];
            suff[i] = max(suff[i], C[i]);
        }
        ll mx = 0;
        for(int i = 0; i < n; i++){
            mx = max(mx, C[i]);
            cur+=min(mx, suff[i]), cur%=md;
        }
        if(cur < 0) cur+=md;
        ans+=cur;
        ans%=md;
    }

    cout << ans << "\n";
}

• Subtask 1: 8 / 8
• Subtask 2: 0 / 17
• Subtask 3: 0 / 19
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 30