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#6489. 生日礼物

https://loj.ac/s/1596482
This commit is contained in:
Baoshuo Ren 2022-10-06 09:50:27 +08:00
parent 02f7508daf
commit b5f23aa936
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
21 changed files with 140 additions and 0 deletions

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#include <iostream>
#include <cmath>
#include <functional>
#include <queue>
#include <utility>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e5 + 5;
int n, m, p = 1, a[N], pre[N], suf[N], ans;
bool vis[N];
std::priority_queue<
std::pair<int, int>,
std::vector<std::pair<int, int>>,
std::greater<>>
q;
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 1, x; i <= n; i++) {
cin >> x;
if (a[p] * x < 0) {
a[++p] = x;
} else {
a[p] += x;
}
}
int cnt = 0;
for (int i = 1; i <= p; i++) {
pre[i] = i - 1;
suf[i] = i + 1;
if (a[i] > 0) {
ans += a[i];
cnt++;
}
q.emplace(std::abs(a[i]), i);
}
while (cnt > m) {
while (vis[q.top().second]) q.pop();
auto o = q.top();
q.pop();
if (pre[o.second] != 0 && suf[o.second] != p + 1 || a[o.second] > 0) {
cnt--;
ans -= o.first;
int l = pre[o.second],
r = suf[o.second];
a[o.second] += a[l] + a[r];
q.emplace(std::abs(a[o.second]), o.second);
pre[suf[l]] = pre[l];
suf[pre[l]] = suf[l];
vis[l] = true;
pre[suf[r]] = pre[r];
suf[pre[r]] = suf[r];
vis[r] = true;
}
}
cout << ans << endl;
return 0;
}

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