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OI-codes/Luogu/P2286/P2286.cpp

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#include <algorithm>
#include <iostream>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int mod = 1e6;
int n, op, x, ans;
std::vector<int> a, b;
int main() {
std::ios::sync_with_stdio(false);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> op >> x;
if (op == 0) {
if (b.empty()) {
a.insert(std::lower_bound(a.begin(), a.end(), -x), -x);
} else {
auto it = std::lower_bound(b.begin(), b.end(), -x);
if (it == b.end() || it != b.begin() && std::abs(-*it - x) > std::abs(-*(it - 1) - x)) --it;
ans = (ans + std::abs(-*it - x)) % mod;
b.erase(it);
}
} else { // op == 1
if (a.empty()) {
b.insert(std::lower_bound(b.begin(), b.end(), -x), -x);
} else {
auto it = std::lower_bound(a.begin(), a.end(), -x);
if (it == a.end() || it != a.begin() && std::abs(-*it - x) > std::abs(-*(it - 1) - x)) --it;
ans = (ans + std::abs(-*it - x)) % mod;
a.erase(it);
}
}
}
cout << ans % mod << endl;
return 0;
}