제출 #731399

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
731399		eneskav	Političari (COCI20_politicari)	C++17	0 / 70	2 ms	340 KiB

politicari

#include <iostream>
#include <vector>
#include <cstring>
#define int long long
using namespace std;
#define fastio                        \
	ios_base::sync_with_stdio(false); \
	cin.tie(NULL);                    \
	cout.tie(NULL);
signed main()
{
	fastio;
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
	int n, k;
	cin >> n >> k;
	int a[n + 1][n + 1];
	for (int i = 1; i <= n; ++i)
		for (int j = 1; j <= n; ++j)
			cin >> a[i][j];
	if (k <= 2)
	{
		cout << k;
		return 0;
	}
	bool vis[n + 1][n + 1];
	memset(vis, false, sizeof(vis));
	int p = 0, c = 1;
	vector<int> v;
	v.push_back(1);
	a[c][p] = 2;
	for (int i = 1; i < k * 2; ++i)
	{
		int t = c;
		c = a[c][p];
		p = t;
		if (vis[c][p])
		{
			v.pop_back();
			break;
		}
		vis[c][p] = true;
		v.push_back(c);
	}
	// print v
	/* for (auto i : v)
		cout << i << " ";
	cout << endl; */
	cout << v[(k - 1) % v.size()];
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

politicari.cpp: In function 'int main()':
politicari.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen("input.txt", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
politicari.cpp:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  freopen("output.txt", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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