#include <stdio.h>

int n; /* Then number of nodes */
int dist[16][16]; /* dist[i][j] is the length of the edge between i and j if
			it exists, or 0 if it does not */

void printDist() {
	int i, j;
	printf("    ");
	for (i = 0; i < n; ++i)
		printf("%4c", 'A' + i);
	printf("\n");
	for (i = 0; i < n; ++i) {
		printf("%4c", 'A' + i);
		for (j = 0; j < n; ++j)
			printf("%4d", dist[i][j]);
		printf("\n");
	}
	printf("\n");
}

/*
	floyd_warshall()

	after calling this function dist[i][j] will the the minimum distance
	between i and j if it exists (i.e. if there's a path between i and j)
	or 0, otherwise
*/
void floyd_warshall() {
	int i, j, k;
	for (k = 0; k < n; ++k) {
		printDist();
		for (i = 0; i < n; ++i)
			for (j = 0; j < n; ++j)
				/* If i and j are different nodes and if 
					the paths between i and k and between
					k and j exist, do */
				if ((dist[i][k] * dist[k][j] != 0) && (i != j))
					/* See if you can't get a shorter path
						between i and j by interspacing
						k somewhere along the current
						path */
					if ((dist[i][k] + dist[k][j] < dist[i][j]) ||
						(dist[i][j] == 0))
						dist[i][j] = dist[i][k] + dist[k][j];
	}
	printDist();
}

int main(int argc, char *argv[]) {
	FILE *fin = fopen("dist.txt", "r");
	fscanf(fin, "%d", &n);
	int i, j;
	for (i = 0; i < n; ++i)
		for (j = 0; j < n; ++j)
			fscanf(fin, "%d", &dist[i][j]);
	fclose(fin);

	floyd_warshall();

	return 0;
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public final class Grafo {

	private int nnodos;

	private int nodos[][][];

	private char nombres[];

	Grafo(int n) {
		this.nnodos = n;
		this.nodos = new int[nnodos][nnodos][2];
		this.nombres = new char[nnodos];
	}

	public void ingresarArco(int n1, int n2, int peso) {
		this.nodos[n1][n2][0] = peso;
		this.nodos[n2][n1][0] = peso;
		this.nodos[n1][n2][1] = n1;
		this.nodos[n2][n1][1] = n2;
	}

	public void ingresarNombre(int nodo, char letra) {
		this.nombres[nodo] = letra;
	}

	public void calcular() {
		int i, j, k;
		for (i = 0; i < this.nnodos; i++) {
			for (j = 0; j < this.nnodos; j++) {
				for (k = 0; k < this.nnodos; k++) {
					if (this.nodos[i][k][0] + this.nodos[k][j][0] < this.nodos[i][j][0]) {
						this.nodos[i][j][0] = this.nodos[i][k][0]
								+ this.nodos[k][j][0];
						this.nodos[i][j][1] = k;
					}
				}
			}
		}
	}

	public int pesominimo(int org, int des) {
		return this.nodos[org][des][0];
	}

	public String caminocorto(int org, int des) {
		String cam;
		if (org == des) {
			cam = "->" + nombres[org];
		} else {
			cam = caminocorto(org, this.nodos[org][des][1]) + "->"
					+ nombres[des];
		}
		return cam;
	}

	public char getNombre(int nodo) {
		return this.nombres[nodo];
	}

	public static void main(String args[]) throws IOException {
		Grafo g;

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String temp;
		int res;

		System.out.println("Entre el numero de nodos del grafo:\n");
		temp = br.readLine();
		res = Integer.parseInt(temp);

		g = new Grafo(res);

		for (int i = 0; i < res; i++) {
			System.out.println("Cual es el nombre del nodo [" + (i + 1)
					+ "]:\n");
			temp = br.readLine();
			g.ingresarNombre(i, temp.charAt(0));
		}
		for (int i = 0; i < res; i++) {
			for (int j = 0; j < res; j++) {
				if (i < j) {
					System.out.println("El nodo " + g.getNombre(i)
							+ " esta conectado con el nodo " + g.getNombre(j)
							+ " (s/n)\n");
					temp = br.readLine();
					if (temp.charAt(0) == 's') {
						int peso;
						System.out.println("Cual es el peso del arco:\n");
						temp = br.readLine();
						peso = Integer.parseInt(temp);
						g.ingresarArco(i, j, peso);
					} else {
						g.ingresarArco(i, j, 10000);
					}
				}
			}
		}

		g.calcular();
		for (int i = 0; i < res; i++) {
			for (int j = 0; j < res; j++) {
				if (i > j) {
					System.out.println("El camino mas corto entre los nodos:"
							+ g.getNombre(i) + "-" + g.getNombre(j) + " es: \n"
							+ g.caminocorto(i, j) + " y su peso es: "
							+ g.pesominimo(i, j));
				}
			}
		}
	}
}