Go: package main

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

const BIG_COST = 200000

const (
	ST_NOT_YET = iota
	ST_JOINED
)

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	nNodes := scanInt(sc)

	costs := make([][]int, nNodes)
	graph := make([][]int, nNodes)

	states := make([]int, nNodes)
	costSums := make([]int, nNodes)

	for i := 0; i < nNodes; i++ {
		costs[i] = make([]int, nNodes)
		costSums[i] = BIG_COST
	}

	for i := 0; i < nNodes; i++ {
		u := scanInt(sc)
		k := scanInt(sc)
		graph[u] = make([]int, k)
		for d := 0; d < k; d++ {
			v := scanInt(sc)
			graph[u][d] = v
			costs[u][v] = scanInt(sc)
		}
	}

	costSums[0] = 0
	for {
		minCost := BIG_COST
		var u int

		for i, cost := range costSums {
			if states[i] != ST_JOINED && cost < minCost {
				minCost = cost
				u = i
			}
		}

		if minCost == BIG_COST {
			break
		}

		states[u] = ST_JOINED

		for _, v := range graph[u] {
			cost := minCost + costs[u][v]
			if cost < costSums[v] {
				costSums[v] = cost
			}
		}
	}

	w := bufio.NewWriter(os.Stdout)
	for i, cost := range costSums {
		fmt.Fprintf(w, "%d %d\n", i, cost)
	}
	w.Flush()
}

func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	v, _ := strconv.Atoi(sc.Text())
	return v
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i=0; i<(n); i++)
#define NIL -1
#define WHITE 0
#define GRAY 1
#define BLACK 2
#define INF 1 << 21

//ダイクストラ法
void dijkstra(vector<vector<int> > &graph, int n){

    vector<int> cost(n, INF);
    vector<int> color(n, WHITE);

    cost[0] = 0;
    color[0] = GRAY;
    while(1){
        int minv = INF;
        int u = NIL;    //現在地
        rep(i, n){
            if(cost[i] < minv && color[i] != BLACK){
                minv = cost[i];
                u = i;
            }
        }
        if(u == NIL) break;

        color[u] = BLACK;
        rep(j, n){
            if(color[j] != BLACK && graph[u][j] != NIL){
                if(cost[j] > cost[u] + graph[u][j]){
                    cost[j] = cost[u] + graph[u][j];
                    color[j] = GRAY;
                }
            }
        }
    }

    rep(i, n){
        cout << i << " " << cost[i] << endl;
    }
}

int main() {

    int n;
    cin >> n;
    vector<vector<int> > graph(n, vector<int>(n, INF));
    int k, c, u , v;
    rep(i, n){
        cin >> u >> k; //u 頂点  k 隣接リストの個数
        rep(j, k){
            cin >> v;      //隣接リストの番号
            cin >> graph[u][v]; //隣接リストの重み
        }
    }

    dijkstra(graph, n);

    return 0;
}