20190908_poj3279

#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

int a[17][17];
int b[17][17];
int c[17][17];
int ans[17][17];

void change(int i, int j) {
    if(b[i][j] == 1)
        b[i][j] = 0;
    else b[i][j] = 1;
}

void manage(int i, int j) {
    change(i,j);
    change(i-1,j);
    change(i,j-1);
    change(i+1,j);
    change(i,j+1);
    c[i][j] = 1;
}

int main() {
    int m,n;
    cin >> m;
    cin >> n;
    int max = 1;
    for(int i = 1; i <= m; ++i)
        for(int j = 1; j <= n; ++j)
            scanf("%d", &a[i][j]);
    for(int i = 0; i < n; ++i)
        max *= 2;
    int t = 300;
    for(int i = 0; i < max; ++i) {
        memset(c, 0, sizeof(c));
        int count = 0;
        for(int i = 1; i <= m; ++i)
            for(int j = 1; j <= n; ++j)
                b[i][j] = a[i][j];
        int cnt = 1;
        int tt = i;
        while(tt >= 1) {
            if((tt & 1) == 1) {
                manage(1,cnt);
                count++;
            }
            tt = tt >> 1;
        }
        int flag = 0;
        for(int i = 2; i <= m; ++i)
            for(int j = 1; j <= n; ++j) {
                if(b[i-1][j] == 1) {
                    manage(i,j);
                    count++;
                }
            }
        for(int j = 1; j <= n; ++j)
            if(b[m][j] == 1)
                flag = 1;
        if(t > count && flag == 0) {
            t = count;
            for(int i = 1; i <= m; ++i)
                for(int j = 1; j <= n; ++j)
                    ans[i][j] = c[i][j];
        }
    }
    if(t == 300)
        cout << "IMPOSSIBLE" << endl;
    else for(int i = 1; i <= m; ++i) {
        for(int j = 1; j <= n; ++j) {
            cout << ans[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
}