希望更丰富的展现？使用Markdown
by yyk504 @ 2019-05-02 20:57:58
希望更丰富的展现？[使用Mark♂down](https://www.luogu.org/wiki/show?name=%E5%B8%AE%E5%8A%A9%EF%BC%9Amarkdown)
by aminoas @ 2019-05-02 20:58:21
@[长江豚](/space/show?uid=179309)
by yyk504 @ 2019-05-02 20:59:37
请不要用Markdown来强调头文件的重要性
by Smile_Cindy @ 2019-05-02 21:11:11
~~请不要使用markdown来强调define的重要性(~~
by wxwoo @ 2019-05-02 21:17:00
```cpp
#include<cstdio>
#include<cstdlib>
#include<iostream>
using namespace std;
#define maxm 100005
#include <algorithm>
int n,m; int pre[1005]; int find (int x) { int r=x; while(r!=pre[r]) { r=pre[r]; } int lx=x; int ly; while(lx!=r) { ly=pre[lx]; pre[lx]=r; lx=ly; } return r; } void join(int x,int y) { int kx=find (x); int ky=find (y); if(kx!=ky) { pre[x]=pre[y]; }
}
struct note { int x,y,z; }a[10010]; bool cmp(note v,note w) { return v.z < w.z; }
int main() { cin>>n>>m; for(int i=1;i<=m;i++) cin>>a[i].x>>a[i].y>>a[i].z; for(int i=1;i<=n;i++) pre[i]=i; sort(a+1,a+1+m,cmp); int side =0; for(int i=1;i<=m;i++) { int fx ,fy ; fx=find(a[i].x); fy=find (a[i].y); if(fx!=fy) { join(a[i].x,a[i].y); side+=a[i].z; } } int ans=0; for(int i=1;i<=n;i++) { if(i==pre[i]) ans++; if(ans>=2) break; } if(ans==1) { cout<<side; } else { cout<<"-1"; } return 0; }
```
by eeesc03 @ 2019-05-02 21:19:30
额
by 矢信 @ 2019-05-02 21:38:30
这代码。。。有人来分个行吗
by xQAQyn @ 2019-05-02 21:41:01
```c
#include<cstdio>
#include<cstdlib>
#include<iostream>
using namespace std;
#define maxm 100005
#include <algorithm>
int n,m;
int pre[1005];
int find (int x) {
int r=x;
while(r!=pre[r]) {
r=pre[r];
}
int lx=x;
int ly;
while(lx!=r) {
ly=pre[lx];
pre[lx]=r;
lx=ly;
}
return r;
}
void join(int x,int y) {
int kx=find (x);
int ky=find (y);
if(kx!=ky) {
pre[x]=pre[y];
}
}
struct note {
int x,y,z;
} a[10010];
bool cmp(note v,note w) {
return v.z < w.z;
}
int main() {
cin>>n>>m;
for(int i=1; i<=m; i++) cin>>a[i].x>>a[i].y>>a[i].z;
for(int i=1; i<=n; i++) pre[i]=i;
sort(a+1,a+1+m,cmp);
int side =0;
for(int i=1; i<=m; i++) {
int fx ,fy ;
fx=find(a[i].x);
fy=find (a[i].y);
if(fx!=fy) {
join(a[i].x,a[i].y);
side+=a[i].z;
}
}
int ans=0;
for(int i=1; i<=n; i++) {
if(i==pre[i]) ans++;
if(ans>=2) break;
}
if(ans==1) {
cout<<side;
} else {
cout<<"-1";
}
return 0;
}
```
是这样的吧。。。
by 厂长 @ 2019-05-02 21:48:27
@[长江豚](/space/show?uid=179309) 吐槽一下；
能不能把
```cpp
using namespace std;
```
打在
```cpp
#include <ios>
#include <map>
#include <set>
#include <list>
#include <stack>
#include <deque>
#include <cmath>
#include <queue>
#include <cstdio>
#include <cctype>
#include <iosfwd>
#include <bitset>
#include <limits>
#include <vector>
#include <cwchar>
#include <string>
#include <cerrno>
#include <utility>
#include <clocale>
#include <iomanip>
#include <complex>
#include <fstream>
#include <cstdlib>
#include <cstring>
#include <ostream>
#include <istream>
#include <sstream>
#include <cwctype>
#include <iostream>
#include <algorithm>
#include <stdexcept>
#include <streambuf>
#include <exception>
#include <functional>
```
以及
```cpp
#define ......
#define ......
```
的后面。
这是个好习惯。。。。
by G_M_H @ 2019-05-02 23:16:02