2630 색종이 만들기

재귀호출을 묻는 문제

 

문제: https://www.acmicpc.net/problem/2630

깃허브주소: https://github.com/surinoel/boj/blob/master/2630.cpp

 

	#include <iostream>
	using namespace std;
	int mat[128][128];
	void go(int n, int x, int y, int &b, int &w) {
	if (n == 1) {
	if (mat[x][y] == 1) b += 1;
	else w += 1;
	return;
	}
	bool ok = true;
	int target = mat[x][y];
	for (int i = x; i < x + n; i++) {
	for (int j = y; j < y + n; j++) {
	if (target != mat[i][j]) {
	ok = false;
	}
	}
	}
	if (ok) {
	if (target == 1) b += 1;
	else w += 1;
	}
	else {
	go(n / 2, x, y, b, w);
	go(n / 2, x + n / 2, y, b, w);
	go(n / 2, x, y + n / 2, b, w);
	go(n / 2, x + n / 2, y + n / 2, b, w);
	}
	return;
	}
	int main(void) {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int n;
	cin >> n;
	for (int i = 0; i < n; i++) {
	for (int j = 0; j < n; j++) {
	cin >> mat[i][j];
	}
	}
	int b = 0, w = 0;
	go(n, 0, 0, b, w);
	cout << w << '\n' << b << '\n';
	return 0;
	}

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