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我枚举写的 算dfs吧 也只要204ms 为什么bfs dfs会这么大#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <string.h>
#include <queue>
#include <vector>
#include <map>
#include <math.h>
using namespace std;
typedef long long ll;
#define clr(s,x) memset(s,x,sizeof(s))
#define Max(a,b) a > b ? a : b
#define Min(a,b) a > b ? b : a
char s[4][4];
int vis[4][4];
bool press[4][4];
void init()
{
for(int i = 0 ; i < 4; i ++)
{
for(int j = 0; j < 4; j++)
scanf("%c",&s[i][j]);
getchar();
}
clr(vis,0);
clr(press,0);
}
void change(int x,int y)
{
for(int i = 0 ; i < 4; i++)
vis[x][i] ++;
for(int i = 0; i < 4; i++)
vis[i][y]++;
vis[x][y]--;
press[x][y] = press[x][y] ? false: true;
}
bool check()
{
for(int i= 0 ; i < 4 ; i++)
for(int j = 0; j < 4; j++)
if( (s[i][j] == '+' && vis[i][j]%2 )|| (s[i][j] == '-' && !(vis[i][j]%2))) continue;
else return false;
/*for(int i = 0 ; i < 4; i ++)
{
for(int j = 0; j < 4; j++)
cout<<vis[i][j]<<" ";
cout<<endl;
}*/
return true;
}
void output()
{
int ans = 0;
for(int i = 0 ; i < 4; i++)
for(int j =0 ; j < 4; j++)
if(press[i][j]) ans++;
printf("%d\n",ans);
for(int i = 0 ; i < 4; i++)
for(int j =0 ; j < 4; j++)
if(press[i][j]) printf("%d %d\n", i+1,j+1);
}
bool solve(int x,int y)
{
if(x == 3 && y== 3)
{
if(check()) return true;
change(3,3);
if(check()) return true;
change(3,3);
return false;
}
int nx,ny;
if(y == 3) ny = 0,nx = x + 1;
else nx = x, ny = y+1;
if(solve(nx,ny)) return true;
change(x,y);
if(solve(nx,ny)) return true;
change(x,y);
return false;
}
int main()
{
init();
if(solve(0,0)) output();
else printf("wa\n");
/*for(int i = 0; i < 4; i++)
for(int j = 0; j < 4; j++)
cout<<s[i][j];*/
return 0;
}
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