Submission #458030

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
458030	2021-08-07 19:23:30	fuad27	Fancy Fence (CEOI20_fancyfence)	C++14	100 / 100	106 ms	6084 KiB

fancyfence

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#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define mod (long long)1000000007
ll sum(ll n) {
  return (n*(n+1))/2;
}
ll multiply(ll a, ll b) {
  a%=mod;
  b%=mod;
  return (a*b)%mod;
}
int main () {
  ll n, ans = 0;
  cin >> n;
  ll h[n+1] = {0}, w[n+1] = {0}, pref[n+1] = {0}, dp[n+1] = {0};
  for(int i = 1;i<=n;i++) {
      cin >> h[i];
  }
  for(int i = 1;i<=n;i++) {
    cin >> w[i];
  }
  for(int i = 1;i<=n;i++) {
    pref[i] = pref[i-1]+w[i]; 
  }
  stack<ll> s;
  s.push(0);
  for(int i = 1;i<=n;i++) {
    while(!s.empty() and h[s.top()] >= h[i])s.pop();
    dp[i] = dp[s.top()]+multiply(sum(h[i]), (pref[i] - pref[s.top()]));
 
 
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• Subtask 1: 0 / 0
• Subtask 2: 12 / 12
• Subtask 3: 13 / 13
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 18 / 18
• Subtask 7: 27 / 27