@[Danny_chan](/user/1032960) 那道题啊
by mc_him @ 2024-02-26 19:46:59
https://www.luogu.com.cn/discuss/781175
by c20220625 @ 2024-02-26 19:49:04
```cpp
#include<bits/stdc++.h>
using namespace std;
int n, cnt;
string s;
int l[505], bk[505][505];
int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};
void dfs(int x, int y) {
if (x < 1 || x > n || y < 1 || y > l[x] || !bk[x][y])
return;
bk[x][y] = 0;
for (int k = 0; k <= 3; k++) dfs(x + dx[k], y + dy[k]);
return;
}
int main() {
cin >> n;
getline(cin, s);
for (int i = 1; i <= n; i++) {
getline(cin, s);
l[i] = s.length();
for (int j = 1; j <= l[i]; j++) {
if (s[j - 1] >= 'a' && s[j - 1] <= 'z')
bk[i][j] = 1;
}
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= l[i]; j++) {
if (bk[i][j]) {
dfs(i, j);
cnt++;
}
}
}
cout << cnt;
return 0;
}
@[Danny_chan](/user/1032960) 顺着你的思路写了一个代码
by OJ_killer @ 2024-02-26 20:46:13
```cpp
#include<iostream>
using namespace std;
int n;
string s[1010];
bool f[1010][1010];
int sum=0,line=1;
int maxx=-1e9;
int dx[4]={-1,0,1,0};
int dy[4]={0,1,0,-1};
int l[1010];
void dfs(int x,int y){
for(int i=0;i<4;i++){
int x1=x+dx[i];
int y1=y+dy[i];
if(x1<=0||x1>n||y1<=0||y1>l[x]) continue;//maxx换为当前行的长度，每行长度不一
if(s[x1][y1]<'a'||s[x1][y1]>'z') continue;
if(f[x1][y1]==true) continue;
f[x1][y1]=true;
dfs(x1,y1);
}
}
int main(){
cin>>n;
for(int i=0;i<=n;i++){//"i=1"改为"i=0",把cin的换行符吃掉，否则会少输入一行
getline(cin,s[i]);
l[i]=s[i].size(); //计算当前行长度
}
for(int i=1;i<=n;i++){
for(int j=1;j<=l[i];j++){
if(s[i][j]>='a'&&s[i][j]<='z'&&f[i][j]==false){
dfs(i,j);
sum++;
}
}
}
cout<<sum;
return 0;
}
```
by czy0407 @ 2024-02-26 20:48:35
@[Danny_chan](/user/1032960) 明显是因为没判断数据末尾的字符 `\r`。
by angiing1222 @ 2024-02-26 21:04:55
谢谢各位大佬，已关
by Danny_chan @ 2024-02-26 21:14:01