이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define pb push_back
#define sz(x) (int)x.size()
#define all(x) begin(x),end(x)
#define lb(x,y) lower_bound(all(x),y)-begin(x)
mt19937 rng;
void solve() {
int N; cin >> N;
priority_queue<ll> left, right;
for (int i = 0; i < 2 * N; i++) left.push(0), right.push(0);
ll h = 0;
ll lOff = 0, rOff = 0;
for (int i = 0; i < N; i++) {
int a, b; cin >> a >> b;
rOff += a;
lOff -= b;
rOff -= b;
if (i + 1 < N) {
h += abs(-right.top() + rOff);
if (0 < -right.top() + rOff) {
left.push(-lOff);
h -= (-right.top() + rOff) - (left.top() + lOff);
right.push(-(left.top() + lOff - rOff));
left.pop();
} else {
right.push(rOff);
}
if (0 < -right.top() + rOff) {
left.push(-lOff);
} else {
right.push(rOff);
left.push(-right.top() + rOff - lOff);
right.pop();
}
}
}
ll a = 0;
while (left.top() + lOff > 0) {
h += a * ((-right.top() + rOff) - (left.top() + lOff));
a--;
right.push(-(left.top() + lOff - rOff));
left.pop();
}
while (-right.top() + rOff < 0) {
left.push(-right.top() + rOff - lOff);
right.pop();
a++;
h += a * ((-right.top() + rOff) - (left.top() + lOff));
}
h -= a * (-right.top() + rOff);
cout << h << "\n";
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
rng = mt19937(chrono::steady_clock::now().time_since_epoch().count());
solve();
return 0;
}
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