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poj3984(经典dfs)

 

题目链接:http://poj.org/problem?id=3984

分析:直接深搜从起点到终点,如何取最短路线,其实只要优先向下或向右走即可。

#include <cstdio>#include <cstring>#include <cmath>#include <iostream>#include <algorithm>#include <queue>#include <cstdlib>#include <stack>#include <vector>#include <set>#include <map>#define LL long long#define mod 1000000007#define inf 0x3f3f3f3f#define N 100010using namespace std;int s[10][10];stack<int>s1,s2;int vis[10][10];int judge(int a,int b){    return a>=0&&a<5&&b>=0&&b<5&&s[a][b]==0&&!vis[a][b];}int dfs(int x,int y){    if(x==4&&y==4)    {        s1.push(x);s2.push(y);return 1;    }    vis[x][y]=1;    if(judge(x,y+1)&&dfs(x,y+1)||judge(x+1,y)&&dfs(x+1,y)||       judge(x-1,y)&&dfs(x-1,y)||judge(x,y-1)&&dfs(x,y-1))    {        s1.push(x);s2.push(y);return 1;    }    else    {        return 0;    }    return 0;}void print(){    while(!s1.empty())    {        printf("(%d, %d)\n",s1.top(),s2.top());        s1.pop();s2.pop();    }}int main(){    memset(vis,0,sizeof(vis));    for(int i=0;i<5;i++)        for(int j=0;j<5;j++)scanf("%d",&s[i][j]);    dfs(0,0);print();}
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poj3984(经典dfs)