Dijkstra_byMatrix.cpp

/*************************************
 dijkstra algorithms : using Adj. Matrix
 @author Amirul Islam (shiningfalsh)
 *************************************/

#include <cstdio>
#include <iomanip>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <algorithm>
#include <string>
#include <vector>
#include <queue>
#include <map>
#include <set>
#include <sstream>
#include <stack>
#include <list>
#include <iostream>
#include <assert.h>
#include <limits>
#include <bits/stdc++.h>

#define mem(x, y) memset(x,y,sizeof(x))
#define CLEAR(x) memset(x,0,sizeof(x))

#define pb push_back
#define Sort(v) sort(v.begin(),v.end())
#define _sort(s, n) sort(s, s+n)
#define sqr(x) ((x)*(x))

#define le 5001
#define ERR 1e-9
#define pi (2*acos(0))
#define PI 3.141592653589793
#define INT_MX 2147483647

#define scanint(a) scanf("%d",&a)
#define scanLLD(a) scanf("%lld",&a)

typedef long long ll;
using namespace std;

////////////////////////////////////////

const int MX = 100;
int g[MX][MX];
int dis[MX];
bool vis[MX];
int nodes;

inline int minDistance() {
	int minValue = INT_MX, minIndex = 0;
	for (int i = 0; i < nodes; i++)
		if (!vis[i] && dis[i] < minValue)
			minValue = dis[i], minIndex = i;
	return minIndex;
}

void dijkstra(int src) {
	for (int i = 0; i < nodes; i++)
		dis[i] = INT_MX, vis[i] = false;
	dis[src] = 0;
	for (int i = 0; i < nodes-1; i++) {
		int u = minDistance();
		vis[u] = true;
		for (int v = 0; v < nodes; v++) {
			if (!vis[v] && g[u][v] && dis[u] != INT_MX && dis[u] + g[u][v] < dis[v])
				dis[v] = dis[u] + g[u][v];
		}
	}
	for (int i = 0; i < nodes; i++) printf("%d - %d\n", i, dis[i]);
}

int main() {
	scanf("%d", &nodes);
	/*********************************
	CLEAR(g);
	for (int i = 0; i < edges; i++) {
		scanf("%d %d %d", &u, &v, &w);
		if (g[u][v] != 0)
			if (g[u][v] < w)
				continue;
		g[u][v] = w;
		g[v][u] = w;
	}
	**********************************/
	for (int i = 0; i < nodes; i++)
		for (int j = 0; j < nodes; j++)
			scanf("%d", &g[i][j]);
	dijkstra(0);
	return 0;
}

/*
INPUT:
-----
3
0 5 2
5 0 1
2 1 0

OUTPUT:
------
0 - 0
1 - 3
2 - 2
*/