Submission #197858

#	Time	Username	Problem	Language	Result	Execution time	Memory
197858		triplem5ds	Strah (COCI18_strah)	C++14	110 / 110	728 ms	23892 KiB

strah

#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")

#include "bits/stdc++.h"
using namespace std;

#define pb push_back
#define F first
#define S second
#define f(i,a,b)  for(int i = a; i < b; i++)
#define endl '\n'

using ll = long long;
using db = long double;
using ii = pair<int, int>;

const int N = 1e5 + 5, LG = 19, MOD = 1e9 + 7;
const int SQ =320;
const long double EPS = 1e-7;
char g[2005][2005];
int a[2005][2005];
int n, m;
int getR(int l, int r){
  return r * (r + 1) / 2 - l * (l - 1) /2;
}
int32_t main(){
#ifdef ONLINE_JUDGE
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif

  cin >> n >> m;

  f(i,0,n)
    f(j,0,m)
      cin >> g[i][j];

  for(int i = n - 1; i >= 0; --i){
    f(j,0,m){
      if(g[i][j] == '.')a[i][j] = a[i+1][j] + 1;
    }
  }
  ll sum = 0;
  f(i,0,n){
    vector<int> stk;  stk.push_back(-1);
    f(j,0,m){
      while(stk.size() > 1 && a[i][stk.back()] >= a[i][j])stk.pop_back();
      stk.pb(j);
      int mn = INT_MAX;
      for(int k = stk.size()-1; k >= 1; --k){
        sum += a[i][stk[k]] * (a[i][stk[k]] + 1) / 2 * getR(j-stk[k]+1,j-stk[k-1]);
      }

    }

  }

  cout << sum << '\n';


  return 0;
}

Compilation message (stderr)

strah.cpp: In function 'int32_t main()':
strah.cpp:49:11: warning: unused variable 'mn' [-Wunused-variable]
       int mn = INT_MAX;
           ^~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
• Subtask 5: 11 / 11
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 11 / 11
• Subtask 9: 11 / 11
• Subtask 10: 11 / 11