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P1503 鬼子进村
R70496187
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35
Luogu/P1503/P1503.cpp
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35
Luogu/P1503/P1503.cpp
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#include <iostream>
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#include <set>
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#include <stack>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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int n, m, x;
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char op;
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std::set<int> set;
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std::stack<int> st;
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> n >> m;
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set.insert(0);
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set.insert(n + 1);
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while (m--) {
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cin >> op;
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if (op == 'D') {
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cin >> x;
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set.insert(x);
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st.push(x);
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} else if (op == 'R') {
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set.erase(st.top());
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st.pop();
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} else {
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cin >> x;
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auto it = set.lower_bound(x);
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cout << (*it == x ? 0 : *it - *--it - 1) << endl;
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}
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}
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return 0;
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}
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