提示:
#include<iostream>
#include<queue>
using namespace std;
#define maxn 100
struct nod
{
int x, y;
}node;
int n, m;
int a[maxn][maxn];
bool inq[maxn][maxn] = { false };
queue<nod>q;
int X[] = { 0,0,1,-1 };
int Y[] = { 1,-1,0,0 };
bool judge(int x,int y)
{
if (a[x][y] == 0 || inq[x][y] == true)return false;
if (x >= n || x < 0 || y >= n || y < 0 )
return false;
return true;
}
void BFS(int x, int y)
{
node.x = x;
node.y = y;
q.push(node);
inq[node.x][node.y] = true;
int nowx, nowy;
while (!q.empty())
{
nod temp = q.front();
q.pop();
for (int i = 0; i < 4; i++)
{
nowx = temp.x + X[i];
nowy = temp.y + Y[i];
if (judge(nowx, nowy))
{
node.x = nowx;
node.y = nowy;
inq[nowx][nowy] = true;
q.push(node);
}
}
}
}
int main()
{
FILE* streaml;
freopen_s(&streaml, "input.txt", "r", stdin);
cin >> n >> m;
int ans = 0;
for (int i = 0; i < n; i++)
for (int j = 0; j < m; j++)
cin >> a[i][j];
for (int i = 0; i < n; i++)
{
for (int j = 0; j < m; j++)
{
if (a[i][j] == 1&&inq[i][j]==false)
{
ans++;
BFS(i, j);
}
}
}
cout << ans << endl;
return 0;
} 
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