Go: ///
// File:  0558.go
// Author: ymiyamoto
//
// Created on Sun Mar  4 20:58:45 2018
//
package main

import (
	"fmt"
	"strconv"
	"strings"
)

type pos struct {
	x, y int
}

var H, W, N int
var graph [][]string

func wfs(p pos, index int) (int, pos) {
	var q []pos
	dists := make([][]int, H)
	for i := range dists {
		dists[i] = make([]int, W)
	}

	q = append(q, p)
	for len(q) > 0 {
		p := q[0]
		dist := dists[p.x][p.y]
		q = q[1:]

		for _, d := range []pos{{-1, 0}, {1, 0}, {0, -1}, {0, 1}} {
			x := p.x + d.x
			y := p.y + d.y
			if 0 <= x && x < H && 0 <= y && y < W && graph[x][y] != "X" && dists[x][y] == 0 {
				dists[x][y] = dist + 1
				q = append(q, pos{x, y})
			}
		}
	}

	for i := range graph {
		for j := range graph[i] {
			if graph[i][j] == strconv.Itoa(index) {
				return dists[i][j], pos{i, j}
			}
		}
	}

	panic("not found")
}

func main() {
	fmt.Scan(&H, &W, &N)

	var start pos

	graph = make([][]string, H)
	for i := range graph {
		var s string
		fmt.Scan(&s)
		graph[i] = strings.Split(s, "")
		for j := range graph[i] {
			if graph[i][j] == "S" {
				start.x = i
				start.y = j
			}
		}
	}

	count := 0
	for i := 1; i <= N; i++ {
		c, s := wfs(start, i)
		start = s
		count += c
	}

	fmt.Println(count)
}

C++: #include <iostream>
#include <queue>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
using namespace std;
 
 
 
int main()
{
 
    queue < pair<int, int> > q;
    pair<int, int> p;
 
 
 
    char **m;
    char c[10] = { "123456789" };
    int **f;
	bool flg = false;
    int n, k, i, i1, c1, i2, sum = 0;
    cin >> n;
    cin >> k;
    cin >> c1;
 
    m = new char *[n + 2];
    f = new int *[n + 2];
 
    for (i = 0; i < n + 2; i++){
        m[i] = new char[k + 2];
        f[i] = new int[k + 2];
    }
 
    for (i = 1; i <= n; i++){
        for (i1 = 1; i1 <= k; i1++){
            cin >> m[i][i1];
        }
    }
 
    for (i = 0; i < n + 2; i++){
        for (i1 = 0; i1 < k + 2; i1++){
            if (i == 0 || i == n + 1){
                m[i][i1] = 'X';
            }
            else if (i1 == 0 || i1 == k + 1){
                m[i][i1] = 'X';
            }
        }
    }
 
    for (i = 1; i <= n; i++){
        for (i1 = 1; m[i][i1] != '\0'; i1++){
            if (m[i][i1] == 'S'){
                q.push(make_pair(i, i1));
            }
        }
    }
 
 
 
    pair<int, int> temp;
 
    temp = q.front();
 
    for (i = 0; i < c1; i++){

		if(flg == false){
			for (i1 = 0; i1 < n + 2; i1++){
				for (i2 = 0; i2 < k + 2; i2++){
					if (i1 == 0 || i1 == n + 1){
						f[i1][i2] = 1;
					}
					else if (i2 == 0 || i2 == k + 1){
						f[i1][i2] = 1;
					}
					else
						f[i1][i2] = -1;
				}
			}
			flg = true;
		}
        f[temp.first][temp.second] = 0;
 
		while (!q.empty()){
            p = q.front();
            q.pop();
 
            int x[4] = { -1, 1, 0, 0 }, y[4] = { 0, 0, -1, 1 };
 
            for (int j = 0; j < 4; j++){
 
                //???????????´??????????´¢
                if (m[p.first + x[j]][p.second + y[j]] != 'X' && f[p.first + x[j]][p.second + y[j]] < 0){
                    q.push(make_pair(p.first + x[j], p.second + y[j]));
                    f[p.first + x[j]][p.second + y[j]] = f[p.first][p.second] + 1;
                }
            }
            //??´?????????????????????
            if (m[p.first][p.second] == c[i]){
                sum += f[p.first][p.second];
                temp = p;
                while (!q.empty()){
                    q.pop();
                }
                q.push(p);
                break;
			}
		}
	}
 
    cout << sum << endl;
 
    return 0;
}

C++: #include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
using namespace std;

#define MAX 1000
int y[MAX][MAX];
int x[MAX][MAX];
int px[10];
int py[10];
int main(){
	memset(y,127,sizeof(y));
	char T[12]={'.','1','2','3','4','5','6','7','8','9','S','X'};
	int n,m,c,d,sum;
	string S;
	sum=0;
	cin>>n>>m>>c;
	for(int i=0;i<n;i++){
		cin>>S;
		for(int j=0;j<m;j++){
			for(int k=0;k<12;k++){
				if(S[j]==T[k]){
					x[i][j]=k;
					if(k==10){
						px[0]=i;
						py[0]=j;
					}
					if(k>=1 && k<=9){
						px[k]=i;
						py[k]=j;
					}
				}
			}
		}
	}
	for(int i=1;i<=c;i++){
		memset(y,127,sizeof(y));
		y[px[i-1]][py[i-1]]=0;
		for(int j=0;j<n*m/4+2;j++){
			for(int k=0;k<n;k++){
				for(int l=0;l<m;l++){
					if(k>=1){
						if(x[k-1][l]!=11){
							y[k-1][l]=min(y[k-1][l],y[k][l]+1);
						}
					}
					if(l>=1){
						if(x[k][l-1]!=11){
							y[k][l-1]=min(y[k][l-1],y[k][l]+1);
						}
					}
					if(x[k+1][l]!=11){
						y[k+1][l]=min(y[k+1][l],y[k][l]+1);
					}
					if(x[k][l+1]!=11){
						y[k][l+1]=min(y[k][l+1],y[k][l]+1);
					}
				}
			}
			if(y[px[i]][py[i]]<1000000){
				goto Exit;
			}
		}
		Exit:;
		sum += y[px[i]][py[i]];
	}
	cout<<sum<<endl;
	return 0;
}

C++: #include <iostream>
#include <queue>
#include <unordered_map>
#include <utility>
#include <array>
#include <cstring>

bool isObstacle[1000][1000];
bool done[1000][1000];

int main() {
	int h, w, n;
	std::cin >> h >> w >> n;

	std::unordered_map<int, int> factories;

	for (int i = 0; i < h; ++i) {
		for (int j = 0; j < w; ++j) {
			char c;
			std::cin >> c;

			if (c == 'S')
				factories[0] = j * 1000 + i;
			else if ('1' <= c && c <= '9')
				factories[c - '0'] = j * 1000 + i;
			else if (c == 'X')
				isObstacle[j][i] = true;
		}
	}

	int ans = 0;
	for (int i = 0; i < n; ++i) {
		const int sx = factories[i] / 1000, sy = factories[i] % 1000;
		const int gx = factories[i + 1] / 1000, gy = factories[i + 1] % 1000;

		std::memset(done, 0, sizeof(done));

		done[sx][sy] = true;

		auto candidate = [h, w](int x, int y) {
			std::array<int, 4> arr;
			arr[0] = ((x == 0 || isObstacle[x - 1][y] || done[x - 1][y]) ? -1 : (done[x - 1][y] = true, (x - 1) * 1000 + y));
			arr[1] = ((x == w - 1 || isObstacle[x + 1][y] || done[x + 1][y]) ? -1 : (done[x + 1][y] = true, (x + 1) * 1000 + y));
			arr[2] = ((y == 0 || isObstacle[x][y - 1] || done[x][y - 1]) ? -1 : (done[x][y - 1] = true, x * 1000 + y - 1));
			arr[3] = ((y == h - 1 || isObstacle[x][y + 1] || done[x][y + 1]) ? -1 : (done[x][y + 1] = true, x * 1000 + y + 1));

			return std::move(arr);
		};

		std::queue<std::pair<int, int>> q;
		q.push({ factories[i], 0 });
		while (!q.empty()) {
			const auto& top = q.front();
			const int nx = top.first / 1000, ny = top.first % 1000;
			int cost = top.second;

			auto&& c = candidate(nx, ny);
			for (auto v : c) {
				if (v != -1) {
					if (v / 1000 == gx && v % 1000 == gy) {
						ans += cost + 1;
						q.pop();
						goto end;
					}
					q.push({ v, cost + 1 });
				}
			}

			q.pop();
		}
	end:;
	}

	std::cout << ans << std::endl;
}