8.6.cpp

#include <iostream>
#include <cstdio>
#include <queue>
using namespace std;

enum color{
    red, yellow, blue, green
};

bool paint_fill(color **screen, int m, int n, int x, int y, color c){
    if(x<0 || x>=m || y<0 || y>=n) return false;
    if(screen[x][y] == c) return false;
    else{
        screen[x][y] = c;
        paint_fill(screen, m, n, x-1, y, c);
        paint_fill(screen, m, n, x+1, y, c);
        paint_fill(screen, m, n, x, y-1, c);
        paint_fill(screen, m, n, x, y+1, c);
    }
    return true;
}
int main(){
    freopen("8.6.in", "r", stdin);
    int m, n;
    cin>>m>>n;
    color **screen = new color*[m];
    for(int i=0; i<m; ++i)
        screen[i] = new color[n];
    for(int i=0; i<m; ++i)
        for(int j=0; j<n; ++j){
            int t;
            cin>>t;
            screen[i][j]=(color)t;
        }
    
    // color screen[5][5] = {
    //     {red, green, green, blue, yellow},
    //     {green, red, yellow, green, green},
    //     {green, green, red, blue, green},
    //     {red, green, green, green, yellow},
    //     {red, yellow, red, blue, yellow}
    // };
    paint_fill(screen, 5, 5, 1, 2, green);
    for(int i=0; i<5; ++i){
        for(int j=0; j<5; ++j)
            cout<<screen[i][j]<<" ";
        cout<<endl;
    }
    fclose(stdin);
    return 0;
}