Submission #531631

#	Time	Username	Problem	Language	Result	Execution time	Memory
531631		Tam_theguide	Tracks in the Snow (BOI13_tracks)	C++14	2.19 / 100	1715 ms	798828 KiB

tracks

#include <bits/stdc++.h>
using namespace std;
int n, m;
char a[4005][4005];
char last;
const int dx[4]={0, 0, 1, -1};
const int dy[4]={1, -1, 0, 0};
bool visited[4005][4005];
int ans=0;
bool check(int i, int j){
    if (1<=i && i<=n && 1<=j && j<=m) return true;
    else return false;
}
void floodfill(int i, int j){
    if (check(i, j)==false || visited[i][j]) return;
    visited[i][j]=true;
    for (int t=0; t<4; t++){
        int u=i+dx[t];
        int v=j+dy[t];
        floodfill(u, v);
    }
}
int main(){
    cin>>n>>m;
    for (int i=1;i <=n; i++){
        for (int j=1; j<=m; j++){
            cin>>a[i][j];
            if (i==1 && j==1){
                last=a[i][j];
            }
            if (a[i][j]!=last && a[i][j]!='.'){
                ans=1;
            }
        }
    }
    for (int i=1;i <=n; i++){
        for (int j=1; j<=m; j++){
            if (a[i][j]==last && visited[i][j]==false){
                ans++;
                floodfill(i, j);
            }
        }
    }
    cout<<ans;

}

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