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라이브러리

Floyd-Warshall

by 유시은 2020. 8. 15.
#include <iostream>
#include <algorithm>
#define INF 1e9
#define NODES 101
using namespace std;

int N, M; // 노드 간선 수
int dist[NODES][NODES];

int main()
{
	cin.tie(0); cout.tie(0); ios::sync_with_stdio(0);

	cin >> N >> M;
	for (int i = 1; i <= N; ++i) {
		for (int j = 1; j <= N; ++j) {
			dist[i][j] = (i == j ? 0 : INF);
		}
	}
	for (int i = 1; i <= M; ++i) {
		int u, v, w;
		cin >> u >> v >> w;
		dist[u][v] = min(dist[u][v], w);
	}
	for (int k = 1; k <= N; k++) {
		for (int i = 1; i <= N; i++) {
			for (int j = 1; j <= N; j++) {
				dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
			}
		}
	}

	for (int i = 1; i <= N; ++i) {
		for (int j = 1; j <= N; ++j) {
			cout << (dist[i][j] < INF ? dist[i][j] : 0) << " ";
		}cout << "\n";
	}

	return 0;
}

 

BOJ https://www.acmicpc.net/problem/11404

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