Submission #840893

#TimeUsernameProblemLanguageResultExecution timeMemory
8408937modySoccer Stadium (IOI23_soccer)C++17
8 / 100
4555 ms696 KiB
#include "soccer.h" #include <bits/stdc++.h> using namespace std; typedef long long ll; vector<vector<int>> row; vector<vector<int>> col; vector<vector<int>> arr; int n; bool check(int x1,int y1,int x2,int y2){ if(x1==x2) return (row[x1][y1] - row[x2][y2] == 0); if(y1==y2) return (col[x1][y1] - col[x2][y2] == 0); return ((row[x1][y1] - row[x1][y2] == 0 && col[x1][y2] - col[x2][y2] == 0) || (col[x1][y1] - col[x2][y1] == 0 && row[x2][y1] - row[x2][y2] == 0)); } int biggest_stadium(int N, vector<vector<int>> F) { arr=F; n=N; int ans=0; row=F; col=F; for(int i=0; i < n;i++){ for(int j=1; j < n;j++){ row[i][j]+=row[i][j-1]; col[j][i]+=col[j-1][i]; } } // for(auto c : row){ // for(auto g : c){ // cout << g << ' '; // } // cout << endl; // } // for(auto c : col){ // for(auto g : c){ // cout << g << ' '; // } // cout << endl; // } queue<pair<int,int>> q; for(int i=0; i < n;i++){ for(int j=0; j < n;j++){ int curr=1; if(!arr[i][j]){ q.push({i+1,j}); q.push({i,j+1}); q.push({i-1,j}); q.push({i,j-1}); } vector<pair<int,int>> found; vector<vector<bool>> vis(n,vector<bool>(n)); vis[i][j]=true; found.push_back({i,j}); while(!q.empty()){ int x=q.front().first,y=q.front().second; q.pop(); bool ok=true; if(x==-1 || x==n || y==-1 || y==n || arr[x][y] || vis[x][y]) continue; for(pair<int,int> c : found){ if(!check(c.first,c.second, x , y)){ ok=false; break; } } if(!ok) continue; vis[x][y]=true; found.push_back({x,y}); curr++; // cout << curr << ' ' << x << ' ' << y << endl; q.push({x+1,y}); q.push({x,y+1}); q.push({x-1,y}); q.push({x,y-1}); } ans=max(ans,curr); } } return ans; } // void solve(){ // int n; cin >> n; // vector<vector<int>> arr(n,vector<int>(n)); // for(int i=0; i < n;i++){ // for(int j=0; j < n;j++){ // cin >> arr[i][j]; // } // } // cout << biggest_stadium(n,arr) << endl; // } // int main(){ // ios::sync_with_stdio(false); // cin.tie(); // cout.tie(); // int t=1; // cin >> t; // while(t--){ // solve(); // } // }
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