8922 두찌 수열

1000번까지 수행한 후 zero가 아니라면 loop이다

 

문제: https://www.acmicpc.net/problem/8922

깃허브주소: https://github.com/surinoel/boj/blob/master/8922.cpp

 

	#include <cmath>
	#include <vector>
	#include <iostream>
	using namespace std;
	int main(void) {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int tc;
	cin >> tc;
	while (tc--) {
	int n;
	cin >> n;
	vector<int> a(n);
	for (int i = 0; i < n; i++) {
	cin >> a[i];
	}
	bool ok = true;
	for (int i = 0; i < 1000; i++) {
	vector<int> b(n);
	for (int j = 0; j < n; j++) {
	if (j == n - 1) {
	b[j] = abs(a[j] - a[0]);
	}
	else {
	b[j] = abs(a[j] - a[j + 1]);
	}
	}
	bool iszero = true;
	for (int j = 0; j < n; j++) {
	if (b[j] != 0) {
	iszero = false;
	break;
	}
	}
	if (iszero) {
	ok = false;
	break;
	}
	a = b;
	}
	if (!ok) {
	cout << "ZERO\n";
	}
	else {
	cout << "LOOP\n";
	}
	}
	return 0;
	}

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