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OI-codes/S2OJ/1871/1871.cpp

121 lines
2.3 KiB
C++

#include <iostream>
#include <cmath>
#include <numeric>
#include <queue>
#include <tuple>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 4e5 + 5;
int n, b, c[N], s[N], ans;
std::tuple<int, int, int> a[N];
std::queue<int> q;
bool vis[N];
struct node : std::vector<int> {
int l, r;
node(const int &_l = 0, const int &_r = 0, const std::vector<int> &_base = std::vector<int>())
: std::vector<int>(_base), l(_l), r(_r) {}
} tr[N << 2];
void build(int u, int l, int r) {
tr[u] = node(l, r);
if (l == r) return;
int mid = l + r >> 1;
build(u << 1, l, mid);
build(u << 1 | 1, mid + 1, r);
}
void insert(int u, int x) {
if (std::get<0>(a[x]) <= tr[u].l && tr[u].r <= std::get<1>(a[x])) {
tr[u].emplace_back(x);
return;
}
int mid = (tr[u].l + tr[u].r) >> 1;
if (std::get<0>(a[x]) <= mid) insert(u << 1, x);
if (std::get<1>(a[x]) > mid) insert(u << 1 | 1, x);
}
void update(int u, int x) {
std::vector<int> res;
for (auto p : tr[u]) {
if (!std::get<2>(a[p])) continue;
if (--std::get<2>(a[p])) res.emplace_back(p);
else q.emplace(p);
}
tr[u] = node(tr[u].l, tr[u].r, res);
if (tr[u].l == tr[u].r) return;
int mid = (tr[u].l + tr[u].r) >> 1;
if (x <= mid) update(u << 1, x);
else update(u << 1 | 1, x);
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n;
b = std::ceil(std::sqrt(n));
build(1, 1, n);
for (int i = 1, l, r, k; i <= n; i++) {
cin >> l >> r >> k;
a[i] = {l, r, k};
if (k == 0) {
q.emplace(i);
vis[i] = true;
}
}
while (!q.empty()) {
int x = q.front();
q.pop();
if (ans++ % b == 0) {
std::partial_sum(c + 1, c + n + 1, s + 1);
for (int i = 1; i <= n; i++) {
if (vis[i]) continue;
int l, r, k;
std::tie(l, r, k) = a[i];
if (s[r] - s[l - 1] + b >= k) {
std::get<2>(a[i]) -= s[r] - s[l - 1];
insert(1, i);
vis[i] = true;
}
}
}
update(1, x);
c[x] = true;
}
cout << ans << endl;
return 0;
}