Submission #523240

#	Time	Username	Problem	Language	Result	Execution time	Memory
523240		boykut	Divide and conquer (IZhO14_divide)	C++14	100 / 100	206 ms	149828 KiB

divide

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef tree<int, null_type, less<int>,
rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const long long INF = 1e18, Lim = 1e14;

struct segment_tree {
	long long v, vl, vr;
	segment_tree * left, * right;
	segment_tree(long long l, long long r) {
		vl = l, vr = r;
		v = INF;
		left = right = NULL;
	}
	void update(long long i, long long x) {
		if (vl == vr) {
			v = min(v, x);
		} else {
			long long vm = vl + (vr - vl) / 2;
			if (i <= vm) {
				if (left == NULL) left = new segment_tree(vl, vm);
				left->update(i, x);
			} else {
				if (right == NULL) right = new segment_tree(vm + 1, vr);
				right->update(i, x);
			}
			v = min((left != NULL ? left->v : INF), (right != NULL ? right->v : INF));
		}
	}
	long long query(long long l, long long r) {
		if (l > vr || vl > r) return INF;
		if (l <= vl && vr <= r) return v;
		long long vm = vl + (vr - vl) / 2;
		auto L = (left != NULL ? left->query(l, r) : INF);
		auto R = (right != NULL ? right->query(l, r) : INF);
		return min(L, R);
	}
};

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	segment_tree st(-Lim, Lim);

	int n;
	cin >> n;
	vector<int> x(1 + n), g(1 + n), d(1 + n);
	for (int i = 1; i <= n; i++) {
		cin >> x[i] >> g[i] >> d[i];
	}
	vector<long long> pd(1 + n, 0), pg(1 + n, 0), PG(1 + n, 0);
	for (int i = 1; i <= n; i++) {
		pd[i] = d[i] + pd[i - 1];
		pg[i] = g[i] + pg[i - 1];
	}

	long long ans = 0;
	for (int r = 1; r <= n; r++) {
		st.update(pd[r - 1] - x[r], pg[r - 1]);
		ans = max(ans, pg[r] - st.query(-Lim, pd[r] - x[r]));
	}
	cout << ans << '\n';

	return 0;
}

Compilation message (stderr)

divide.cpp: In member function 'long long int segment_tree::query(long long int, long long int)':
divide.cpp:39:13: warning: unused variable 'vm' [-Wunused-variable]
   39 |   long long vm = vl + (vr - vl) / 2;
      |             ^~

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52