```cpp
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define il inline
#define reg register
const int N = 1000005;
int n, m;
int fa[N];
bool kill[N];
struct node {
int val, ch[2], dist;
} t[N];
il int qrint() {
int s = 0, f = 1;
char ch = getchar();
while (!isdigit(ch)) {
if (ch == '-') f = -1;
ch = getchar();
}
while (isdigit(ch)) {
s = (s << 1) + (s << 3) + (ch ^ 48);
ch = getchar();
}
return s * f;
}
int find(int x) {return x == fa[x] ? x : fa[x] = find(fa[x]);}
int& rs(int x) {return t[x].ch[t[t[x].ch[1]].dist < t[t[x].ch[0]].dist];}
int merge(int x, int y) {
if (!x || !y) return x | y;
if (t[x].val > t[y].val) swap(x, y);
rs(x) = merge(y, rs(x));
t[x].dist = t[rs(x)].dist + 1;
return x;
}
int main() {
n = qrint();
for (reg int i = 1; i <= n; ++i) t[i].val = qrint(), fa[i] = i;
m = qrint();
while (m--) {
char str[5]; scanf("%s", str + 1);
if (str[1] == 'M') {
int x = qrint(), y = qrint();
int fx = find(x), fy = find(y);
if (fx == fy || kill[x] || kill[y]) continue;
fa[fx] = fa[fy] = merge(fx, fy);
}
else {
int x = qrint();
if (!kill[x]) {
x = find(x);
kill[x] = 1;
fa[x] = fa[t[x].ch[0]] = fa[t[x].ch[1]] = merge(t[x].ch[0], t[x].ch[1]);
printf("%d\n", t[x].val);
}
else printf("%d\n", 0);
}
}
return 0;
}
```
代码贴二楼
by Kobe303 @ 2022-02-01 14:25:54
用了 ```kill``` 关键字，已经过了，但是这个关键字是什么时候加入的呢？
by Kobe303 @ 2022-02-01 14:34:36
@[Kobe303](/user/292300) `kill` 不是关键字。
`kill` 是 C 库函数。
by Qiaoqia @ 2022-02-01 14:56:26
@[Qiaoqia](/user/499996)
哦，那为什么本机能过呢？
by Kobe303 @ 2022-02-01 14:58:44
这个程序在我本地就报 CE。
```plain
9:12: error: ‘bool kill [1000005]’ redeclared as different kind of entity
9 | bool kill[N];
| ^
In file included from /usr/include/c++/9/csignal:42,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:43,
from /tmp/CP Editor-EftKDt/sol.cpp:1:
/usr/include/signal.h:112:12: note: previous declaration ‘int kill(__pid_t, int)’
112 | extern int kill (__pid_t __pid, int __sig) __THROW;
| ^~~~
```
by Qiaoqia @ 2022-02-01 14:59:02
@[Kobe303](/user/292300) 系统环境或者编译器版本问题？
by Qiaoqia @ 2022-02-01 14:59:32
@[Qiaoqia](/user/499996) 这样子的啊
by Kobe303 @ 2022-02-01 14:59:59
@[Qiaoqia](/user/499996)
大佬别走，还有一个小问题qwq
```cpp
int& rs(int x) {return t[x].ch[t[t[x].ch[1]].dist < t[t[x].ch[0]].dist];}
```
这个 ```&``` 有什么用？
去掉会报错
by Kobe303 @ 2022-02-01 15:02:16
@[Kobe303](/user/292300)
```cpp
35| rs(x) = merge(y, rs(x));
```
这一行要求返回值必须是左值引用。~~你是不是没有好好听 cwt 讲课？~~
by Qiaoqia @ 2022-02-01 15:10:12
@[Qiaoqia](/user/499996)
。。。您别这么说（
by Kobe303 @ 2022-02-01 15:12:34