Submission #1120409

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120409		vjudge1	Tracks in the Snow (BOI13_tracks)	C++17	0 / 100	654 ms	147588 KiB

tracks

#include <bits/stdc++.h>
using namespace std;
#define int long long
vector<vector<char>> grid(4004,vector<char>(4004));
vector<vector<bool>> vis(4004,vector<bool>(4004,0));
vector<vector<int>> qat(4004,vector<int>(4004,0));
vector<int> dx = {1,0,-1,0};
vector<int> dy = {0,1,0,-1};
int n,m;
int cnt=0;
void dfs(int i,int j,int qat,queue<pair<int,int>> &yolla){
    vis[i][j] = 1;
    for(int ind =0;ind < 4;++ind){
        int x = i + dx[ind];
        int y = j + dy[ind];
        if(x > n || x == 0 || y > m || y == 0)continue;
        if(vis[x][y])continue;
        if(grid[x][y] != grid[i][j]){
            yolla.push({x,y});
        }else dfs(x,y,qat,yolla);
        
    }
}
signed main(){
    int n,m;
    cin >> n >> m;
    bool f=0,r=0;
    for(int i=1;i<=n;++i){
        for(int j=1;j<=m;++j){
            cin >> grid[i][j];
        }
    }
    queue<pair<int,int>> nextt,nextt2,emptyy;
    dfs(1,1,1,nextt);
    int curr=2;
    while(!nextt.empty()){
        nextt2 = emptyy;
        while(!nextt.empty()){
            auto &[x,y] = nextt.front();
            nextt.pop();
            dfs(x,y,curr,nextt2);
        }
        nextt = nextt2;
        curr++;
    }
    cout << curr;

    
}

Compilation message (stderr)

tracks.cpp: In function 'int main()':
tracks.cpp:27:10: warning: unused variable 'f' [-Wunused-variable]
   27 |     bool f=0,r=0;
      |          ^
tracks.cpp:27:14: warning: unused variable 'r' [-Wunused-variable]
   27 |     bool f=0,r=0;
      |              ^

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70