AcWing 844. 走迷宫
原题链接
简单
作者:
小王子_19
,
2024-04-10 18:19:40
,
所有人可见
,
阅读 1
C++ 代码 (要求熟练的默写)
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
typedef pair<int, int> PII;
const int N = 110;
int n, m;
int g[N][N];
int d[N][N];
PII q[N * N];
int bfs()
{
int hh = 0, tt = 0;
q[0] = {0, 0};
memset(d, -1, sizeof d);
d[0][0] = 0;
int dx[] = {-1, 0, 1, 0}, dy[] = {0, 1, 0, -1};
while (hh <= tt)
{
auto t = q[hh ++ ];
for (int i = 0; i < 4; i ++ )
{
int x = t.first + dx[i], y = t.second + dy[i];
if (x >= 0 && x < n && y >= 0 && y < m && g[x][y] == 0 && d[x][y] == -1)
{
d[x][y] = d[t.first][t.second] + 1;
q[ ++ tt] = {x, y};
}
}
}
return d[n - 1][m - 1];
}
int main()
{
cin >> n >> m;
for (int i = 0; i < n; i ++)
for (int j = 0; j < m; j ++)
cin >> g[i][j];
cout << bfs() << endl;
return 0;
}