U5du1e - Online C++0x Compiler & Debugging Tool

#include <iostream>
#include <bits/stdc++.h>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#define You_ss_ef ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pi 3.141592654
#define tc int T; cin >> T; while (T--)
#define FP(_) fixed << std::setprecision(_)
#define Gaza main
#define ll long long
#define ld long double
#define ss << ' '
#define el << '\n'
#define all(_) _.begin(), _.end()
#define rall(_) _.rbegin(), _.rend()
#define uni(_) _.erase(unique(all(_)), _.end())
using namespace std;
void IO() {
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}
int dx[] = { 1 , -1 , 0 , 0 , 1 , 1 , -1 , -1 };
int dy[] = { 0 , 0 , -1 , 1 , 1 , -1 , -1 , 1 };
int ans = 0;
vector <int> num;
vector <pair<int,int>> idx;
vector <vector <int>> v;
bool valid()
{
    vector <pair<int,pair<int,int>>> a;
    for(int i = 1; i <= 3; i++) {
        for(int j = 1; j <= 3; j++) {
            a.push_back({v[i][j],{i,j}});
        }
    }
    int cnt = 0;
    for(int i = 1; i < 9; i++) {
        int x1 = a[i].second.first , y1 = a[i].second.second;
        int x2 = a[i+1].second.first , y2 = a[i+1].second.second;
        if(abs(x1-x2) == 1 or abs(y1-y2) == 1) cnt++;
    }
    return cnt == 8;
}
void answer()
{
    set <int> st;
    v = vector <vector <int>> (5, vector <int> (5,150));
    for(int i = 1; i <= 3; i++) {
        for(int j = 1; j <= 3; j++) {
            char x;  cin >> x;
            v[i][j] = x - '0';
            if(!v[i][j]) idx.push_back({i,j});
            st.emplace(v[i][j]);
        }
    }
    for(int i = 1; i <= 9; i++) {
        if(!st.count(i)) num.push_back(i);
    }
    do {
        for(int i = 0; i < idx.size(); i++) {
            int x = idx[i].first , y = idx[i].second;
            v[x][y] = num[i];
        }
        if(valid()) {
            ans++;
            for(int i = 1; i <= 3; i++) {
                for(int j = 1; j <= 3; j++) {
                    cout << v[i][j] ss;
                }
                cout el ;
            }
            cout el;
        }
    } while(next_permutation(all(num)));
    cout << ans;
}
int Gaza()
{   You_ss_ef
    IO();
    int TC = 1;
    // cin >> TC;
    do {
        answer();
        TC--;
        if (TC)
            cout el;
    } while (TC != 0);
    return 0;
}