# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
303400 | BeanZ | Fancy Fence (CEOI20_fancyfence) | C++14 | 35 ms | 5120 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// I_Love_LPL
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
const int N = 1e5 + 5;
const int mod = 1e9 + 7;
ll h[N], w[N], sum[N], g[N];
ll dp[N];
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
if (fopen("A.inp", "r")){
freopen("test.inp", "r", stdin);
freopen("test.out", "w", stdout);
}
ll n;
cin >> n;
ll ans = 0;
for (int i = 1; i <= n; i++) cin >> h[i];
for (int i = 1; i <= n; i++) cin >> w[i], g[i] = g[i - 1] + w[i];
h[0] = 0;
stack<ll> s;
s.push(0);
for (int i = 1; i <= n; i++){
while (s.size()){
if (h[s.top()] > h[i]) s.pop();
else break;
}
dp[i] = (w[i] * (w[i] + 1) / 2) % mod * ((h[i] * (h[i] + 1) / 2) % mod) % mod;
sum[i] = sum[s.top()] + (g[i - 1] - g[s.top()]) * ((h[i] * (h[i] + 1) / 2) % mod) % mod;
dp[i] = (dp[i] + sum[i] * w[i]) % mod;
ans = (ans + dp[i]) % mod;
sum[i] = (sum[i] + ((h[i] * (h[i] + 1) / 2) % mod) * w[i] % mod) % mod;
s.push(i);
}
cout << ans;
}
/*
2
2 2
2 4
*/
Compilation message (stderr)
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