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<iomanip>
#include<map>
#include<set>
#include<string>
#include<algorithm>
#include<cmath>
#include<vector>
#include<queue>
#include<stack>
 
using namespace std;
 
#define P(p) cout<<(p)<<endl
#define rep(i,m,n) for(int i = (m); i < (int)(n); i++)
#define rrep(i,m,n) for(int i=(int)(m); i>=(int)(n); i--)
#define vsort(v) sort(v.begin(), v.end());
#define rvsort(v) sort(v.begin(), v.end(),greater<int>());
#define YES cout<<"YES"<< endl
#define NO cout<<"NO"<<endl
#define Yes cout<<"Yes"<<endl
#define No cout<<"No"<<endl  
#define yes cout<<"yes"<<endl
#define no cout<<"no"<<endl
#define ret return
#define C(i) cin>>i
#define C2(i,j) cin>>i>>j
#define C3(i,j,k) cin>>i>>j>>k
#define C4(i,j,k,m) cin>>i>>j>>k>>m
////////////////////////////////////////////////////////////

struct S{
  int num;
  int x;
  int y;
};

int main(){
  int h,w,n;
  C3(h,w,n);
  
  int f[h][w] = {};
  pair<int,int> g[n+1];
  pair<int,int> s[n+1];
  rep(i,0,h){
    rep(j,0,w){
      char c;
      cin >> c;
      if(c == 'X'){
        f[i][j] = -1;
      }
      else if(c == '.'){
        f[i][j] = 0;
      }
      else if(c == 'S'){
        pair<int,int> tt = {j,i};
        s[1] = tt;
      }
      else{
        int t = c - '0';
        f[i][j] = t;
        pair<int,int> tt = {j,i};
        g[t] = tt;
        
        if(t < n){
          s[t+1] = tt;
        }

      }
    }
  }

  int ans = 0;
  rep(i,1,n+1){
    int sx = s[i].first;
    int sy = s[i].second;
    int gx = g[i].first;
    int gy = g[i].second;
    //printf("sx:%d sy:%d gx:%d gy:%d\n",sx,sy,gx,gy);
    queue<struct S> q;
    struct S tmp = {0,sx,sy};
    q.push(tmp);
    
    int fNum[h][w];
    rep(i,0,h)
      rep(j,0,w)
      fNum[i][j] = 0xFFFF;
    

    while(!q.empty()){
      struct S s = q.front();
      //printf("i:%d n:%d x:%d y:%d\n",i,s.num,s.x,s.y);
      q.pop();
      if(f[s.y][s.x] == -1){
        continue;
      }
      if(s.num >= fNum[s.y][s.x] && s.num != 0)
        continue;

      fNum[s.y][s.x] = s.num;
      if(s.y == gy && s.x == gx)
        continue;

      else{
        if(s.y > 0){
          if(f[s.y-1][s.x] != -1&& fNum[s.y-1][s.x] > s.num+1){
            struct S t = {s.num+1,s.x,s.y-1};
            q.push(t);
          }
        }
        if(s.x + 1 <= w - 1 ){
          if(f[s.y][s.x+1] != -1 && fNum[s.y][s.x+1] > s.num+1){
            struct S r = {s.num+1,s.x+1,s.y};
            q.push(r);
          }
        }
        if(s.x > 0){
          if(f[s.y][s.x-1] != -1 && fNum[s.y][s.x-1] > s.num+1){
            struct S l = {s.num+1,s.x-1,s.y};
            q.push(l);
          }
        }
        if(s.y + 1 <= h -1 ){
          if(f[s.y+1][s.x] != -1 && fNum[s.y+1][s.x] > s.num+1){
            struct S b = {s.num+1,s.x,s.y+1};     
            q.push(b);
          }
        }
      }
    }

    ans += fNum[gy][gx];
  }

  P(ans);

  ret 0;
}

C++: #include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <string>
#include <functional>
#include <array>
#include <stack>
#include <queue>
#include <chrono>
#include <numeric>

#pragma warning(disable:4996)
#define REP(i,n) for(int i = 0 ; i < n ; ++i)
typedef long long Int;

using namespace std;

struct point{
	long j, i,step;
	point(int i_, int j_,long s) :i(i_), j(j_),step(s){}
};

int dx[4] = { 0, -1, 0, 1 };
int dy[4] = { 1, 0, -1, 0 };

queue<point> que;
char tile[1000][1000];
int H, W;
bool ed[1000][1000];

point solve(char target)
{
	while (!que.empty()){
		point now(que.front());
		ed[now.j][now.i] = true;
		que.pop();
		REP(i, 4){
			int x = now.j + dx[i];
			int y = now.i + dy[i];

			if (x < 0 || y < 0 || x > W || y > H || ed[x][y])
				continue;

			if (tile[y][x] == target){
				return point(y, x,now.step+1);
			}

			if (tile[y][x] != 'X'){
				que.push(point(y, x, now.step + 1));
				ed[x][y] = true;
			}
		}
	}
}

int main()
{
	cin.tie(0); ios::sync_with_stdio(false);
	//fstream fs("input.txt");
	////////////ここから開始///////////
	int n(0);
	cin >> H >> W >> n;

	REP(i, 1000)REP(j, 1000)tile[i][j] = 'X';

	REP(i, H)REP(j, W)cin >> tile[i][j];

	REP(i, H)REP(j, W){ if (tile[i][j] == 'S')que.emplace(point(i, j, 0)); }
	long ans;
	for(int i = 0 ; i < n ; ++i){
		REP(i_1, 1000)REP(j_1, 1000){ ed[i_1][j_1] = false; }
		point t = solve('1' + i);
		que = {};
		que.emplace(t);
		ans = t.step;
	}
	
	cout << ans << endl;

	return 0;
}

C++: #include<iostream>
#include<vector>

using namespace std;

int nowS = 0;
int x, y, n;
int mp[1000][1000] = {};
int k[4] = {1, -1, 0, 0};
int h[4] = {0, 0, 1, -1};
int cx[9] = {};
int cy[9] = {};
vector<int> bufX, bufY, bufD;

bool search(int xx, int yy, int dd) {
	bufX.erase(bufX.begin());
	bufY.erase(bufY.begin());
	bufD.erase(bufD.begin());

	cout << xx << " " << yy << endl;

	for (int i = 0; i < 4; i++) {
		if (xx + k[i] < 0 || xx + k[i] >= x || yy + h[i] < 0 || yy + h[i] >= y)
			continue;
		if (mp[yy + h[i]][xx + k[i]] != 0) {
			continue;
		}
		if (cx[nowS] == xx + k[i] && cy[nowS] == yy + h[i]) {
			nowS++;
			bufX.clear();
			bufY.clear();
			bufD.clear();
			if (nowS == n) {
				cout << dd + 1 << endl;
				return true;
			}
			else {
				bufX.push_back(xx + k[i]);
				bufY.push_back(yy + h[i]);
				bufD.push_back(dd + 1);
			}
			return false;
		}
		if(mp[yy + h[i]][xx + k[i]] == 0){
			bufX.push_back(xx + k[i]);
			bufY.push_back(yy + h[i]);
			bufD.push_back(dd + 1);
		}
	}
	return false;
}

int main() {
	int ch = 0;
	cin >> y >> x >> n;
	for (int i = 0; i < y; i++) {
		char c[1001];
		cin >> c;
		for (int j = 0; j < x; j++) {
			if(c[j] == 'X')
				mp[i][j] = -1;
			else if(c[j] == 'S'){
				bufX.push_back(j);
				bufY.push_back(i);
				bufD.push_back(0);
				mp[i][j] = 0;
			}	
			else {
				mp[i][j] = 0;
			}
			if (c[j] >= 48 && c[j] <= 57) {
				int m;
				m = c[j] - 49;
				cx[m] = j;
				cy[m] = i;		
				ch++;
			}
		}
	}
	

	while(!search(bufX[0], bufY[0], bufD[0])){}

	return 0;
}