백준 소스코드 [C++] 2580 스도쿠

www.acmicpc.net/problem/2580

2580번: 스도쿠

백준 소스코드 [C++] 2580 스도쿠

#include <iostream>
#include <algorithm>
#include <queue>
#include <string.h>
#include <limits.h>
#include <vector>
#include <math.h>
#include <stack>
#include <bitset>
#include <string>
#include <set>
#include <sstream>
#define all(v) v.begin(), v.end()
#define pii pair<int,int>
#define make_unique(v) v.erase(unique(v.begin(), v.end()), v.end())
typedef long long ll;
using namespace std;

int arr[9][9];
struct dot {
	int y, x;
};
vector<dot> dots;

bool chk(dot D, int num) {
	int Y = D.y / 3;
	int X = D.x / 3;

	for (int i = 0;i < 9;i++) if (D.y!=i && arr[i][D.x] == num) return false;
	for (int j = 0;j < 9;j++) if (D.x!=j && arr[D.y][j] == num) return false;

	for (int i = 3 * Y;i < 3 * Y + 3;i++)for (int j = 3 * X;j < 3 * X + 3;j++)
		if (!(D.y==i && D.x==j) && arr[i][j] == num) return false;
	return true;
}
void search(int k) {
	if (k == dots.size()) {
		for (int i = 0;i < 9;i++) {
			for (int j = 0;j < 9;j++) cout << arr[i][j] << " ";
			cout << '\n';
		}
		exit(0);
	}

	dot D = dots[k];
	for (int a = 1;a <= 9;a++) {
		arr[D.y][D.x] = a;
		if (chk(D, a) == true) search(k + 1);
		arr[D.y][D.x] = 0;
	}
	
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	for (int i = 0;i < 9;i++)for (int j = 0;j < 9;j++) {
		cin >> arr[i][j];
		if (arr[i][j] == 0) {
			dot newdot;
			newdot.y = i, newdot.x = j;
			dots.push_back(newdot);
		}
	}
	search(0);
	return 0;
}