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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.  
  18. ll largestRectangleArea(vector <ll> heights) {
  19.     int n = heights.size();
  20.     stack <int> st;
  21.  
  22.     vector<ll> leftsmall(n), rightsmall(n);
  23.  
  24.     for (int i = 0; i < n; i++) {
  25.  
  26.         while (!st.empty() && heights[st.top()] >= heights[i]){
  27.         	st.pop();
  28.         }
  29.  
  30.  
  31.         leftsmall[i]=((st.empty())? 0: st.top() + 1);
  32.  
  33.         st.push(i);
  34.     }
  35.  
  36.  
  37.     while(!st.empty()){
  38.     	st.pop();
  39.     }
  40.  
  41.     for (int i = n - 1; i >= 0; i--) {
  42.         while (!st.empty() && heights[st.top()] >= heights[i]){
  43.         	st.pop();
  44.         }
  45.  
  46.         rightsmall[i] = ((st.empty())? n - 1: st.top() - 1);
  47.  
  48.         st.push(i);
  49.     }
  50.  
  51.     ll mxarea = 0;
  52.     for (int i = 0; i < n; i++){
  53.         mxarea = max(mxarea, heights[i] * (rightsmall[i] - leftsmall[i] + 1));
  54.     }
  55.     return mxarea;
  56. }
  57.  
  58. int solve() {  
  59.     int n;
  60.     cin>>n;
  61.     vector<ll> v(n);
  62.     for(int i=0;i<n;i++){
  63.     	cin>>v[i];
  64.     }
  65.     cout<<largestRectangleArea(v)<<endl;
  66.  
  67.     return 0;
  68. }
  69.  
  70. int main() {
  71.     fastio();
  72.     File();
  73.     int32_t t=1;
  74.     cin>>t;
  75.     for(auto i=t;i--;){
  76.         solve();
  77.     }
  78. }
  79.  
Success #stdin #stdout 0.01s 5276KB
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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/pNpS4p
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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