/*ID: qq104801LANG: C++TASK: maze1*/#include <iostream>#include <fstream>#include <cstring>#include <vector>#include <list>#include <set>#include <queue>#include <cstdio>#include <algorithm>using namespace std;int w,h;int ww,hh;char g[202][80];int v[202][80];//visited?int ddr[4]={-1,0,1,0};int ddc[4]={0,1,0,-1};struct node{    int row;    int col;    int steps;};int bfs(int row,int col){    if(row==0||col==0||row==(hh-1)||col==(ww-1))return 0;    queue<node>q;    node first,now,temp;    first.row=row;    first.col=col;    first.steps=0;    q.push(first);    memset(v,0,sizeof(v));    while(!q.empty())    {        now=q.front();        q.pop();        if(v[now.row][now.col])continue;        v[now.row][now.col]=1;        for(int i=0;i<4;i++)        {            int rr=now.row+ddr[i];            int cc=now.col+ddc[i];            if((rr>=0&&cc>=0&&rr<hh&&col<ww&&g[rr][cc]==‘ ‘)&&(rr==0||cc==0||rr==(hh-1)||cc==(ww-1)))                return now.steps+1;            if(g[rr][cc]==‘ ‘)            {                temp.row=rr+ddr[i];                temp.col=cc+ddc[i];                temp.steps=now.steps+2;                q.push(temp);            }        }    }    return 0;}void test(){        freopen("maze1.in","r",stdin);    freopen("maze1.out","w",stdout);    //cin>>w>>h;        fscanf(stdin,"%d%d",&w,&h);    //cout<<w<<" "<<h<<endl;    ww=2*w+1;    hh=2*h+1;    gets(g[0]);    for(int i=0;i<hh;i++)    {        gets(g[i]);        //cout<<g[i]<<endl;    }        int ans=0;    for(int i=0;i<hh;i++)        for(int j=0;j<ww;j++)        {            if (g[i][j]==‘ ‘ && (i%2==1) && (j%2==1))            {                int tt=bfs(i,j);                ans=max(ans,tt);                            }            else                continue;        }    cout<<(ans-1)/2+1<<endl; }int main () {            test();            return 0;}

USACO TrainingGrader Results     13 users onlineCHN/9 GRC/1 IND/1 KOR/1 MYS/1USER: cn tom [qq104801]TASK: maze1LANG: C++Compiling...Compile: OKExecuting...   Test 1: TEST OK [0.003 secs, 3584 KB]   Test 2: TEST OK [0.003 secs, 3584 KB]   Test 3: TEST OK [0.003 secs, 3584 KB]   Test 4: TEST OK [0.008 secs, 3584 KB]   Test 5: TEST OK [0.054 secs, 3584 KB]   Test 6: TEST OK [0.726 secs, 3584 KB]   Test 7: TEST OK [0.076 secs, 3584 KB]   Test 8: TEST OK [0.486 secs, 3584 KB]   Test 9: TEST OK [0.670 secs, 3584 KB]   Test 10: TEST OK [0.707 secs, 3584 KB]All tests OK.YOUR PROGRAM (‘maze1‘) WORKED FIRST TIME! That‘s fantastic -- and a rare thing. Please accept these special automated congratulations.Here are the test data inputs:------- test 1 ----1 1+-+   +-+------- test 2 ----9 1+-+-+-+-+ +-+-+-+-+|                 |+-+-+-+-+ +-+-+-+-+------- test 3 ----3 3+-+-+-+  |   |+ + + +|   | |+-+-+ +|     |+-+ +-+------- test 4 ----8 7+ + +-+-+-+-+-+-+|   | |   |     |+ + + + + + +-+ +| | |   | | | | |+ + + +-+ + + + +|   | |   | |   |+-+ + + +-+ +-+-+|   |   |     | |+ + +-+ + +-+ + +|       |       |+-+-+-+ +-+ +-+-+|   |     | |   |+ + + +-+ + + +-+|     |         |+-+-+-+-+-+-+-+-+------- test 5 ----25 25+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+|                                                 |+ + + + + + + + + + + + + + + + + + + + + + + + + +|                                                 |+ + + + + + + + + + + + + + + + + + + + + + + + + +|                                                 |+ + + + + + + + + + + + + + + + + + + + + + + + + +|                                                 |+ + + + + + + + + + + + + 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| | |   | | | | |   | | |   |   |   | | | | | | | | | | | |   | |+ + + +-+ +-+ + + +-+ + + + + + + + + + + +-+ +-+ + + + + + + + + + + + +-+ +| | |   | |   | | |   |   | | | |   | |   | | |   | | | | | | | | | | | |   |+ +-+ + + + + + + + +-+ +-+ + +-+ + + +-+ + +-+ + + + + + + + + + + + + + + +|   | | |   | | | | | | |   | |   | | | | |   | | | | | | | |       | | | | |+-+ + +-+-+-+ + + + + + + + + + +-+ + + + + + + +-+ + + + + + + +-+-+ + + + +| | | | | |   | | | | | | |   | | | | | | | | | |   | | | | | | |   | | | | |+ + + + + + + + + + + + +-+-+ + + + + + + + + + + + + + + + + + + + + + + + +| |   | | | | | | | | | |   | | | | | | | | | | | | | | | | | | | | | | | | |+ +-+ + + + + + + + + + + +-+ + + + + + + + + + + + + + + + + + + + + + + + +|   | |   | | | | |   | | | |   | | | | | | | | | | | | | | | | | | | |   | |+ + + +-+ + + + + +-+ + + + + +-+ + + + + + + + + + + + + + + + + + + + +-+ +| |   | | | | | | | | | | | | |   | | | | | | | | | | | | | | | | | | | | | |+ +-+ + + + 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+-+ +-+ +-+ +| |   |                         |     | |   | | | |             | | |     | |+ +-+-+-+ + +-+ + + +-+-+-+-+ + +-+ +-+ +-+ + + + + +-+-+-+ + + + +-+ +-+-+ +|   | |   | |   | |         | |   |     |                 | | |   |   | | | |+ +-+ +-+ +-+-+ +-+-+ + +-+ + + + + +-+-+ +-+-+ +-+ +-+-+-+-+-+-+ + +-+ + +-+| |       |         | | |   | | | |           |   |   | | |   |     | |     |+ + + + +-+-+ +-+-+-+-+ +-+ +-+ +-+-+-+-+ +-+ + +-+ +-+ + + + + + + + + +-+ +| | | | |             |   |   |       | |   | |   |         | | | |       | |+ + + +-+ +-+ + +-+-+ + + + + +-+-+-+-+ +-+-+ +-+ +-+-+ +-+ +-+-+ +-+ + +-+-+| | | |   |   |   | | | | | |               | | |   | | | |     |   | | |   |+-+ + +-+-+ + +-+ + +-+ + + + + + +-+ +-+ +-+-+ +-+-+ +-+ +-+ +-+-+-+-+ + + +|   | |     | | | | | | | | | | | |     |   | |             |       | |   | |+-+ + + +-+ +-+ + + + +-+-+-+-+-+ +-+-+ + + + + + + +-+ +-+-+-+-+-+-+ + +-+ +| | | | |       |       |       |   |   | |     | | |           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    |   |     |       |     |+-+-+-+ +-+ +-+ +-+-+-+ + +-+ + +-+ + +-+-+-+ +-+ + +-+-+-+-+-+-+ + +-+-+ +-+| |   |   | |       |   | | | |   | |       | |   |       |   |   |       | |+ +-+ + + +-+-+ +-+-+-+-+ + + +-+ +-+ +-+ +-+-+ +-+-+ +-+-+ + +-+-+ +-+ + + +|       | |         |     |     |   |   |       |   |     | | | |     | |   |+-+ + + +-+-+ + + +-+-+-+ + +-+-+ +-+ +-+-+ +-+ + + +-+-+-+ +-+ +-+-+-+ + + +| | | |     | | |   |     |   |   |   |   | |     | |     | | |       | | | |+ +-+ + +-+-+-+ + + +-+ + +-+ +-+-+-+ +-+ +-+-+-+-+-+ +-+-+ + + +-+ + +-+-+ +|     |       | | |   | |   |   |         |       | | | | |       | | |   | |+-+ + +-+ + + +-+ + +-+ + +-+ +-+ +-+ +-+ + +-+ +-+ + + + + +-+-+-+-+-+-+ + +|   |   | | | |   | |   |   |   | |   |       |                   | | | | | |+ + + +-+-+-+-+-+ +-+-+ + + +-+ + +-+ + +-+ + +-+ + +-+-+ + +-+-+-+ + + + + +| | |         |   |   | | |   | | | | | |   |   | |     | |             |   |+ + + +-+ + + +-+-+-+ + + +-+-+-+ + + + +-+ +-+ 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      |         | | | |     |+ + +-+-+ + +-+-+ + + +-+-+-+-+ + + +-+ +-+ + +-+ +-+ + + +-+-+ +-+-+ +-+-+-+| | |     |     | | |   |       | | | | | | |   |   | | | |   | | |         |+ + +-+-+ + +-+ + +-+ +-+-+ +-+ +-+-+ +-+ +-+ +-+-+ + +-+ + +-+-+ +-+ +-+-+ +| | |         | | |   |   |   |             |     | | |     |       | |   | |+ +-+-+ + +-+ +-+-+-+ +-+ +-+ + + + + + + + + +-+-+ + + + + + +-+-+-+ + +-+ +|     | | |     |   | |       | | | | | | | |   |   | | | |   |     |     | |+ + + + +-+-+ +-+-+ + +-+ + + + +-+ + +-+-+ +-+ +-+-+-+-+ + + + +-+ + + + +-+| | | |   |     |     | | | | |   | |     | |         |   | |     | | | |   |+-+ + + + + +-+-+-+-+ + + +-+ +-+-+ + +-+ +-+ +-+ + +-+-+ + +-+-+-+ +-+ + + +|   | | | |     |   | |   |       | |   |   |   | |   | | | |   | |   | | | |+-+ +-+ + +-+-+ +-+ + + + + + +-+ +-+ +-+-+-+-+ +-+ +-+ +-+ + +-+ +-+-+-+ + +|     | | |       |   | | | | |   |           | |     |   | |         | | | |+ + +-+-+ + +-+ + +-+ + +-+ +-+ +-+ + + + + + 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    |   |   | |         |     |+-+-+ +-+ + +-+ + +-+ + +-+ +-+ + +-+-+ +-+ + +-+ +-+-+ +-+ + +-+ + +-+-+-+-+|     |   | |   |   | |   | |   | | | |   | |   |   |           | | | |     |+-+-+-+-+ +-+-+-+ +-+-+ +-+-+-+ + + + + +-+-+ +-+ +-+ +-+ + +-+ + +-+ + + + +|         |           |   |     |     | |       |   |   | | |   |       | | |+ +-+ +-+ + +-+ +-+-+-+-+ +-+-+ + + +-+ +-+-+ +-+ + + + +-+-+-+ +-+ + +-+-+-+|   | |   | |         | | |     | |         |   | | | |   | |     | |     | |+ +-+-+-+-+ +-+ + +-+ + +-+ + + +-+ + +-+-+-+ +-+ + + +-+-+ + +-+ + + +-+ + +| |         |   | |     |   | | |   |     |     | | | |         | | |   |   |+-+ + + +-+ +-+ +-+-+ +-+-+-+ +-+-+-+ + + +-+ + +-+-+ +-+-+ + +-+ +-+-+ +-+-+|   | | |   |     | |   |         |   | | |   | | |   |     | |     |       |+-+ +-+ +-+-+ + +-+ + + +-+ + + +-+ + + +-+-+ + + +-+ +-+-+ +-+ +-+-+ + + + +|   |   |     | |     | |   | | |   | |   |   | |     |       |     | | | | |+-+ +-+ +-+-+-+ +-+ + + + +-+ + + +-+ + 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| |       | | |     | | | | |   | | |+ + + + +-+ +-+ +-+-+ + + + +-+-+ +-+ + +-+-+-+-+ + +-+ +-+-+ + + + +-+ + +-+| | |       | |   |   | | |   |   |   | | |       |   | |     | | | |   |   |+ + + +-+-+ + + +-+ + + +-+ +-+ +-+ +-+-+ + +-+-+ +-+-+ +-+ +-+-+ + + +-+ +-+| | | |     |     | | | | |   | |   | |       |       |   | |     | | |     |+-+-+ +-+-+ + + +-+-+ +-+ + +-+ +-+-+ +-+-+-+-+ + + + +-+-+-+ +-+ + +-+-+ +-+| |   |     | | |       |   |     |             | | |     | | | | | |     | |+ +-+ +-+-+ + +-+ + + +-+ +-+-+-+-+ + +-+ + +-+ + +-+ +-+-+ +-+ + + + + + + +|   | | |   |   | | | |         | | | |   | |   | |             | | | | |   |+-+ +-+ +-+-+ +-+-+ +-+ + + + +-+ + +-+-+-+ +-+ +-+-+-+ +-+ +-+ +-+-+ + + +-+|       |         |   | | | | | |   |   |   | | |         | |       | | |   |+-+ + +-+-+-+ +-+-+ +-+-+-+-+-+ +-+ +-+ +-+ + +-+ + +-+ + +-+-+-+-+-+ + +-+ +|   |           |           |   |   |           | | |   |         |   | |   |+-+-+-+ +-+ + +-+-+ + + +-+-+-+ +-+-+-+ +-+ + +-+ +-+-+-+ + +-+ + + + +-+ + +|       |   |     | | | |               | | | |       |   |   | | | | | | | |+ +-+-+ +-+-+ + +-+ +-+-+-+ + + + + +-+ + + +-+ +-+-+ + +-+-+ +-+-+ +-+ +-+-+| | |       | |   |       | | | | | |   |   | |   | | |   |       |   | |   |+-+ + + + + +-+ +-+ + +-+ + + + +-+ +-+ + + + +-+ + +-+ +-+ + + + +-+-+ + +-+| |   | | |   |   | | |   | | |   | |   | |     |     |   | | | |           |+ +-+ + +-+-+ + +-+ + +-+-+ +-+-+-+-+-+-+ +-+-+-+ + + + + +-+ + + +-+ + + +-+|     |     | |   | | |       |           | |     | | | |   | | |   | | |   |+-+ +-+ +-+ +-+-+ +-+ + + +-+-+-+-+ +-+ +-+ + + +-+ +-+ + + +-+-+ + + + +-+-+|   |     |   |   | | | |   |         |     | |   | |   | |   |   | | |     |+ +-+ +-+-+ +-+-+ + + +-+-+ + + + + +-+ + + +-+ + +-+ + + + + + +-+ + + + +-+| |     |     |     |   |   | | | | |   | |   | | |   | | | | | |   | | |   |+-+-+ + +-+ +-+ + +-+-+-+ + + +-+ +-+ +-+ + + + +-+ +-+ + + +-+-+ +-+-+ + +-+|     | |     | | | |   | | | |   |   | 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    |   | | | | | |   |         | | | | |   |   |               |+-+ + +-+ +-+ + +-+ + + + + + + + + +-+ + + +-+-+ +-+ + + + + + + + +-+ + +-+|   |   | |       |               |   | | |       |   |   | | | |           |+ + +-+-+ + + + + + + +-+ +-+ +-+ +-+ +-+ + + + +-+-+ +-+ +-+ +-+ + +-+ +-+-+|       | |     | | |   |       |   |   | | | |     |       | |             |+ + +-+ + +-+ + + + +-+ +-+-+-+ + +-+ +-+-+ +-+-+ + + + +-+ + + + + + + + +-+|         |     | |   |   |   | |   |     |     | | | |   |   | | |   | |   |+-+ +-+-+-+-+ + +-+ +-+ +-+ + +-+-+-+ + +-+-+ + +-+-+-+-+-+ + +-+-+ +-+-+ +-+|             |   |         |     | |       | | |       | | |       |       |+ + + + +-+ + + + + + +-+ +-+-+-+ + + +-+ + + +-+ +-+ + + +-+-+ + +-+ + +-+ +| | | |   | | | | |     | | |   |   |   |   | | |                   | |     |+ + +-+-+-+-+ +-+-+ + +-+ + +-+ + +-+ +-+ +-+ + + +-+ +-+-+ + + + +-+-+ + + +| |     | | |     | |   |       |   |   | | |     | | |     |   | |   | |   |+-+ +-+ + + 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          |       |   |   |   | |   | | |   | |   |     |   |     |+-+-+-+ +-+ +-+ + +-+ +-+ +-+ +-+ +-+ +-+-+-+ + + +-+ + + + +-+ +-+ + +-+ + +|           |   |   | |     |   |   |     | | |     | | | |   |     |   | | |+-+-+-+-+-+ +-+ + + + + + +-+ +-+ +-+ + + + +-+ + +-+-+ +-+-+ +-+ + +-+-+-+-+| |         |   |       |       |   | |   |   |                 | |         |+ +-+ + + +-+ + +-+ + + + +-+ +-+-+-+-+-+-+ + + + +-+ + +-+ + + + +-+-+ + + +|     | | |   | |     |   |             |   |       |   |   |   |   |   | | |+-+ + +-+-+ +-+-+-+ + +-+ + + + +-+-+ + + + + + + + +-+-+ + + + +-+ +-+-+ + +|     |       |     |   | | | |       | | | |           | | | |   | |       |+-+ +-+ + + +-+-+ + + +-+ + + +-+ +-+-+-+-+ + +-+ +-+-+ +-+ + +-+-+ + +-+-+-+|       |       | | |     |     |     |   |   |                 |           |+ +-+-+ + + +-+ + + + +-+-+ +-+-+-+ +-+ +-+ + + + + +-+ + + + +-+ +-+ + +-+ +| |     | | | |   | |   |         |       | | | |     |     |     |   |     |+ +-+ +-+ + + + + +-+-+ + +-+ + + + +-+ +-+-+-+-+ + +-+-+ + + +-+-+ + + +-+ +| |   |   |         |         | | | |           | |   |   | |     | |     | |+-+-+ + + + + +-+ + + + + + + + +-+-+-+ +-+-+ +-+-+ + + + +-+ + + +-+-+ +-+ +|                     | |     |   |       |           | | |     |   |       |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+Keep up the good work!Thanks for your submission!