题目链接
https://www.acwing.com/problem/content/description/846/
思路直接用BFS跑一个最短路就好了,因为边权都是为1的,并且每次只有四个方向选择
代码#include
using namespace std;
//----------------自定义部分----------------
#define ll long long
#define mod 1000000007
#define endl "\n"
#define PII pair
int dx[4]={0,-1,0,1},dy[4]={-1,0,1,0};
ll ksm(ll a,ll b) {
ll ans = 1;
for(;b;b>>=1LL) {
if(b & 1) ans = ans * a % mod;
a = a * a % mod;
}
return ans;
}
ll lowbit(ll x){return -x & x;}
const int N = 1e2+10;
//----------------自定义部分----------------
int n,m,q,a[N][N],vis[N][N];
struct Node{
int x,y,step;
};
bool check(int x,int y){
if(x >= 1 && x = 1 && y n>>m;
for(int i = 1;i a[i][j];
}
}
cout
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