Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var scanner = bufio.NewScanner(os.Stdin)

func nextString() string {
	scanner.Scan()
	return scanner.Text()
}

func nextInt() int {
	n, err := strconv.Atoi(nextString())
	if err != nil {
		fmt.Printf("strconv.Atoi failed: %v\n", err)
	}
	return n
}

var infty = 1000000000

type DirectedGraphNodeID int

type DirectedGraphNode struct {
	key         DirectedGraphNodeID
	adjacents   []*DirectedGraphNode
	costs       []int
	distance    int
	predecessor *DirectedGraphNode
}

func newDirectedGraph(nNodes int) *DirectedGraph {
	graph := DirectedGraph{}
	graph.nodes = make([]*DirectedGraphNode, nNodes)
	for i := 0; i < nNodes; i++ {
		node := DirectedGraphNode{}
		node.key = DirectedGraphNodeID(i)
		node.distance = infty
		graph.nodes[i] = &node
	}
	return &graph
}

type DirectedGraph struct {
	nodes []*DirectedGraphNode
}

func (g *DirectedGraph) setAdjacency(i, j DirectedGraphNodeID, cost int) {
	g.nodes[i].adjacents = append(g.nodes[i].adjacents, g.nodes[j])
	g.nodes[i].costs = append(g.nodes[i].costs, cost)
}

func (g *DirectedGraph) print() {
	for i := 0; i < len(g.nodes); i++ {
		node := g.nodes[i]
		key := node.key
		strings := []string{strconv.Itoa(int(key)), strconv.Itoa(node.distance)}
		for j := 0; j < len(node.adjacents); j++ {
			nodeJ := fmt.Sprintf("(%v, %v)", node.adjacents[j].key, node.costs[j])
			strings = append(strings, nodeJ)
		}
		fmt.Printf("%v\n", strings)
	}
}

func (g *DirectedGraph) relaxEdge(l, r *DirectedGraphNode, w int) {
	if r.distance > l.distance+w {
		// fmt.Printf("%v -> %v, %v\n", l.key, r.key, l.distance+w)
		r.distance = l.distance + w
		r.predecessor = l
	}
}

func main() {
	scanner.Split(bufio.ScanWords)

	nNodes := nextInt()
	graph := newDirectedGraph(nNodes)

	for i := 0; i < nNodes; i++ {
		iNode := DirectedGraphNodeID(nextInt())
		nAdjacent := nextInt()
		for j := 0; j < nAdjacent; j++ {
			jNode := DirectedGraphNodeID(nextInt())
			cost := nextInt()
			graph.setAdjacency(iNode, jNode, cost)
		}
	}

	graph.nodes[0].distance = 0
	for iNode := 0; iNode < nNodes; iNode++ {
		for iLeft := 0; iLeft < len(graph.nodes); iLeft++ {
			nodeLeft := graph.nodes[iLeft]
			for iRight := 0; iRight < len(nodeLeft.adjacents); iRight++ {
				nodeRight := nodeLeft.adjacents[iRight]
				cost := nodeLeft.costs[iRight]
				graph.relaxEdge(nodeLeft, nodeRight, cost)
			}
		}
	}

	// graph.print()

	for iNode := 0; iNode < len(graph.nodes); iNode++ {
		node := graph.nodes[iNode]
		fmt.Println(node.key, node.distance)
	}
}

C++: #include<iostream>
#define MAX 100
#define MAXNUM 10000001
using namespace std;
int n, minv, M[MAX][MAX];
int w[MAX], color[MAX] = {};

void dijkstra() {
	for (int i = 0; i < n; i++) {
		w[i] = MAXNUM;
	}
	w[0] = 0;
	color[0] = 1;
	while (1) {
		minv = MAXNUM;
		int u = -1;
		for (int i = 0; i < n; i++) {
			if (w[i] < minv && color[i] != 2) {
				u = i;
				minv = w[i];
			}
		}
		if (u == -1) break;
		color[u] = 2;
		for (int i = 0; i < n; i++) {
			if (color[i] != 2 && M[u][i] != MAXNUM) {
				if (w[i] > w[u] + M[u][i]) {
					w[i] = w[u] + M[u][i];
					color[i] = 1;
				}
			}
		}
	}
}

int main() {
	int u, k, v, c;
	cin >> n;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			M[i][j] = MAXNUM;
		}
	}
	for (int i = 0; i < n; i++) {
		cin >> u >> k;
		for (int j = 0; j < k; j++) {
			cin >> v >> c;
			M[u][v] = c;
		}
	}
	dijkstra();
	for (int i = 0; i < n; i++) {
		cout << i << " ";
		if (w[i] != MAXNUM) {
			cout << w[i] << endl;
		}
	}
}

C++: #include <bits/stdc++.h>
using namespace std;
static const int MAX=100;
static const int INFTY=1000000000;
static const int WHITE=-1;
static const int BLACK=1;

int A[MAX][MAX],dk[MAX],p[MAX];

void SSSP(int n){
    int C[n];
    for(int i=0;i<n;i++){
        C[i]=WHITE;
        dk[i]=INFTY;
    }
    dk[0]=0;
    while(true){
        int u=-1;int minv=INFTY;
        for(int i=0;i<n;i++){
            if(C[i]==WHITE&&minv>dk[i]){
                minv=dk[i];
                u=i;
            }
        }
        if(u==-1)break;
        C[u]=BLACK;
        for(int i=0;i<n;i++){
            if(C[i]==WHITE&&A[u][i]!=INFTY){
                if(dk[i]>dk[u]+A[u][i]){
                    dk[i]=dk[u]+A[u][i];
                }
            }
        }
    }
}

int main(){
    int n,v,k,u,d;
    cin>>n;
    for(int i=0;i<n;i++)for(int j=0;j<n;j++)A[i][j]=INFTY;

    for(int i=0;i<n;i++){
        scanf("%d %d",&v,&k);
        for(int j=0;j<k;j++){
            scanf("%d %d",&u,&d);
            A[v][u]=d;
        }
    }
    SSSP(n);
    for(int i=0;i<n;i++){
        printf("%d %d\n",i,dk[i]);
    }

}

C++: #include <cstdio>
#include <map>
using namespace std;
static const int INFTY = (1 << 21);
static const int WHITE = 0;
static const int GRAY = 1;
static const int BLACK = 2;

int n;
map<int, int> *M;
int *d;

void dijkstra() {
    int u, minv;
    int d[n], color[n];

    for (int i = 0; i < n; i++) {
        d[i] = INFTY;
        color[n] = WHITE;
    }
    d[0] = 0;

    while (1) {
        u = -1;
        minv = INFTY;
        for (int i = 0; i < n; i++) {
            if (color[i] != BLACK && d[i] < minv) {
                u = i;
                minv = d[i];
            }
        }

        if (u == -1) { break; }

        color[u] = BLACK;
        for (map<int, int>::iterator it = M[u].begin(); it != M[u].end(); it++) {
            if (color[it->first] != BLACK) {
                if (d[u] + it->second < d[it->first]) {
                    d[it->first] = d[u] + it->second;
                    color[it->first] = GRAY;
                }
            }
        }
    }
    
    for (int i = 0; i < n; i++) {
        printf("%d %d\n", i, d[i]);
    }
}

int main() {
    scanf("%d", &n);

    M = new map<int, int>[n];

    for (int i = 0; i < n; i++) {
        int u, k;
        scanf("%d %d", &u, &k);
        for (int j = 0; j < k; j++) {
            int v, c;
            scanf("%d %d", &v, &c);
            M[u][v] = c;
        }
    }

    dijkstra();

    return 0;
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <bitset>
#include <cmath>
#include <queue>
#include <iomanip>
#include <algorithm>
#include <stack>
#include <cmath>
using namespace std;

#define INF 1e18
#define int long long
static const int MAX = 110;
static const int NOTFIXED = 0;
static const int FIXED = 1;

int n, m[MAX][MAX];

void dijkstra() {
    int d[n], status[n];
    for(int i = 0; i < n; i++) {
        d[i] = INF;
        status[i] = NOTFIXED;
    }
    d[0] = 0;
    status[0] = NOTFIXED;

    while(true) {
        int u = -1;
        int minv = INF;
        for(int i = 0; i < n; i++) {
            if(minv > d[i] && status[i] != FIXED) {
                u = i;
                minv = d[i];
            }
        }

        if(u == -1) break;
        status[u] = FIXED;
        for(int v = 0; v < n; v++) {
            if(m[u][v] != INF && status[v] != FIXED) {
                if(d[v] > d[u] + m[u][v]) {
                    d[v] = d[u] + m[u][v];
                    status[v] = NOTFIXED;
                }
            }
        }
    }

    for(int i = 0; i < n; i++) {
        cout << i << " " << (d[i] == INF ? -1 : d[i]) << endl;
    }
}

signed main() {
    cin >> n;

    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            m[i][j] = INF;
        }
    }

    for(int i = 0; i < n; i++) {
        int u, k; cin >> u >> k;
        for(int j = 0; j < k; j++) {
            int v, c; cin >> v >> c;
            m[u][v] = c;
        }
    }

    dijkstra();

    return 0;
}