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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. #define fastio() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie()
  4.  
  5.  
  6.  
  7. using namespace std;
  8. typedef long long ll;
  9.  
  10.  
  11. void File(){
  12.     #ifndef ONLINE_JUDGE
  13.         freopen("input.txt", "r", stdin);
  14.         freopen("output.txt", "w", stdout);
  15.     #endif
  16. }
  17. ll largestRectangleArea(vector <ll> heights) {
  18.     stack<int> st;
  19.  
  20.     ll area,mxarea=-1,top;
  21.     int i=0,n=heights.size();
  22.  
  23.     while(i<n){
  24.         if(st.empty() || heights[i]>=heights[st.top()]){
  25.             st.push(i++);
  26.         }else{
  27.  
  28.             top=st.top();
  29.             st.pop();
  30.  
  31.             area=heights[top]*(st.empty()?i:i-st.top()-1);
  32.  
  33.             mxarea=max(mxarea,area);
  34.  
  35.         }            
  36.     }
  37.     while(!st.empty()){
  38.         top=st.top();
  39.         st.pop();
  40.         area=heights[top]*(st.empty()?i:i-st.top()-1);
  41.         mxarea=max(mxarea,area);
  42.     }    
  43.     return mxarea;
  44. }
  45. int solve() {  
  46.     int n,i=0;
  47.     cin>>n;
  48.     vector<ll> v(n);
  49.     for(int i=0;i<n;i++){
  50.         cin>>v[i];
  51.     }
  52.     cout<<largestRectangleArea(v)<<endl;
  53.  
  54.     return 0;
  55. }
  56.  
  57. int main() {
  58.     fastio();
  59.     File();
  60.     int32_t t=1;
  61.     cin>>t;
  62.     for(auto i=t;i--;){
  63.         solve();
  64.     }
  65. }
  66.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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2
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2 1 4 5 1 3 3
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1000 1000 1000 1000
stdout
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8
4000
https://ideone.com/JHZeB3
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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