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P1503 鬼子进村

R70496187
This commit is contained in:
Baoshuo Ren 2022-03-03 20:32:47 +08:00
parent 351aa5f0a0
commit 6977b74b41
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68

35
Luogu/P1503/P1503.cpp Normal file
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#include <iostream>
#include <set>
#include <stack>
using std::cin;
using std::cout;
const char endl = '\n';
int n, m, x;
char op;
std::set<int> set;
std::stack<int> st;
int main() {
std::ios::sync_with_stdio(false);
cin >> n >> m;
set.insert(0);
set.insert(n + 1);
while (m--) {
cin >> op;
if (op == 'D') {
cin >> x;
set.insert(x);
st.push(x);
} else if (op == 'R') {
set.erase(st.top());
st.pop();
} else {
cin >> x;
auto it = set.lower_bound(x);
cout << (*it == x ? 0 : *it - *--it - 1) << endl;
}
}
return 0;
}