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#1512. 【CSP七连测Day1】高爸

https://sjzezoj.com/submission/56204
This commit is contained in:
Baoshuo Ren 2022-09-09 15:48:28 +08:00
parent b11f436570
commit 7bf70ed9bb
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
22 changed files with 135 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, a, b, c, d_up = 0, d_down = 0;
long long ans = 0;
cin >> n >> a >> b;
std::vector<int> nums, x(n);
for (int& x : x) {
cin >> x;
}
std::set<int> s1;
std::multiset<int> s2;
for (int i = 0; i < n; i++) {
s1.insert(x[i]);
s2.insert(x[i]);
if (i == 0) {
c = x[i];
} else { // i > 0
if (c > x[i]) {
ans += static_cast<long long>(a) * (c - x[i]);
d_down++;
} else if (c < x[i]) {
ans += static_cast<long long>(b) * (x[i] - c);
d_up++;
}
if (c != *s1.begin()) {
auto it = --s1.lower_bound(c);
int d = (d_up + s2.count(c)) * b - d_down * a;
if (d < 0 && c != *it) {
ans += static_cast<long long>(d) * (c - *it);
d_up += s2.count(c);
d_down -= s2.count(*it);
c = *it;
}
}
if (c != *s1.rbegin()) {
auto it = s1.upper_bound(c);
int d = (d_down + s2.count(c)) * a - d_up * b;
if (d < 0 && c != *it) {
ans += static_cast<long long>(d) * (*it - c);
d_up -= s2.count(*it);
d_down += s2.count(c);
c = *it;
}
}
}
cout << ans << endl;
}
return 0;
}

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