@[Roshin](/user/392696) 代码如下：
```c++
#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
typedef std::pair<int, int> PII;
typedef std::pair<ll, ll> PLL;
typedef double db;
#define arr(x) (x).begin(),(x).end()
#define fi first
#define se second
#define pb push_back
#define endl "\n"
using namespace std;
/*----------------------------------------------------------------------------------------------------*/
const int INF = 1e9;
int main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
int m;
cin >> m;
set<PII> sl, sr;
sl.insert({INF, INF});
sr.insert({INF, INF});
while (m--) {
string op;
int l, r;
cin >> op;
if (op == "A") {
cin >> l >> r;
auto it = sl.lower_bound({l, -INF});
int cnt = 0;
while (it->first <= r) {
auto [dl, dr] = *it;
auto ne = next(it);
sl.erase(it);
sr.erase(sr.find({dr, dl}));
cnt++;
it = ne;
}
it = sr.lower_bound({l, -INF});
while (it->first <= r) {
auto [dl, dr] = *it;
auto ne = next(it);
sr.erase(it);
sl.erase(sl.find({dr, dl}));
cnt++;
it = ne;
}
cout << cnt << endl;
sl.insert({l, r});
sr.insert({r, l});
// for (auto t: sr) {
// cout << t << " ";
// }
// cout << endl;
}
else {
cout << sl.size() - 1<< endl;
}
}
return 0;
}
```
by Roshin @ 2022-07-17 14:24:48
@[Roshin](/user/392696) 没考虑包含
by Z_301 @ 2022-09-07 13:34:06
@[Z_301](/user/175087) soga，懂了谢谢！
by Roshin @ 2022-09-07 14:51:09