Submission #675990

#	Time	Username	Problem	Language	Result	Execution time	Memory
675990		Sam_a17	Strah (COCI18_strah)	C++17	110 / 110	149 ms	20428 KiB

strah

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// for random generations
// mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
mt19937 myrand(373);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  if(str == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  } else {
    // freopen("skis.in", "r", stdin);
    // freopen("skis.out", "w", stdout);
  }
}
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 2e3 + 10;
int up[N][N];
char a[N][N];
int n, m;

long long pref(long long x) {
  return x * (x + 1) / 2;
}

long long sum(long long l, long long r) {
  return pref(r) - pref(l - 1);
}

void solve_() {
	cin >> n >> m;
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= m; j++) {
			cin >> a[i][j];
		}
	}

	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= m; j++) {
			if(a[i][j] == '.') {
				up[i][j] = up[i - 1][j] + 1;
			} else {
				up[i][j] = 0;
			}
		}
  }

  long long answ = 0;
  for(int i = n; i >= 1; i--) {
    vector<int> left_Lower(m + 1, 0);
    vector<int> right_Lower_Equal(m + 1, m + 1);
    
    stack<pair<int, int>> st;
    for(int j = 1; j <= m; j++) {
      while(!st.empty() && up[i][j] <= st.top().first) {
        right_Lower_Equal[st.top().second] = j;
        st.pop();
      }
      if(!st.empty()) {
        left_Lower[j] = st.top().second;
      }
      st.push({up[i][j], j});
    }

    for(int j = 1; j <= m; j++) {
      if(!up[i][j]) continue;
      long long r_cnt = right_Lower_Equal[j] - j;
      long long l_cnt = j - left_Lower[j] - 1;

      //
      long long s = 0;
      if(l_cnt > 0 && r_cnt > 0) {
        s = -sum(left_Lower[j] + 1, j - 1) * r_cnt;
        s += sum(j, right_Lower_Equal[j] - 1) * l_cnt;

        s += l_cnt * r_cnt;
      }
      
      long long pref_ = pref(up[i][j]);
      long long y = r_cnt;
      y = pref(y);
      answ += pref_ * y;
      answ += pref_ * s;
    }
  }

  cout << answ << '\n';
}

int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    for(int i = 1; i <= test_case; i++) {
      // cout << "Case #" << i << ": ";
      solve_();
    }
  };
 
  int test_cases = 1;
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
} 

Compilation message (stderr)

strah.cpp: In function 'void setIO(std::string)':
strah.cpp:69:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
strah.cpp:70:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
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• Subtask 10: 11 / 11