Submission #954586

#	Time	Username	Problem	Language	Result	Execution time	Memory
954586		ezzzay	Tracks in the Snow (BOI13_tracks)	C++14	2.19 / 100	2124 ms	990496 KiB

tracks

#include<bits/stdc++.h>
using namespace std;
const int N=4e3+1;
char a[N][N];
int xx[4]={0,0,1,-1};
int yy[4]={1,-1,0,0};
bool vis[N][N];
void dfs(int py, int px, char c){
    a[py][px]='?';
    vis[py][px]=1;
    for(int i=0;i<4;i++){
        if((a[py+yy[i]][px+xx[i]]=='?' or a[py+yy[i]][px+xx[i]]==c) and vis[py+yy[i]][px+xx[i]]==0){
    
            dfs(py+yy[i],px+xx[i],c);
        }
    }
}
signed main(){
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>a[i][j];
        }
    }
    int cnt=0;
    for(int i=n;i>=1;i--){
        for(int j=1;j<=m;j++){
            if(a[i][j]=='F' or a[i][j]=='R'){
                for(int x=1;x<=n;x++){
                    for(int y=1;y<=m;y++)vis[x][y]=0;
                }
                dfs(i,j,a[i][j]);
                cnt++;
                i=1;
                j=1;
            }
        }
    }
    cout<<cnt;
}

• Subtask 1: 0 / 30
• Subtask 2: 2.1875 / 70