Submission #794081

#	Time	Username	Problem	Language	Result	Execution time	Memory
794081		alex_2008	Divide and conquer (IZhO14_divide)	C++14	100 / 100	38 ms	7128 KiB

divide

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
using namespace std;
typedef long long ll;
const int N = 1e5 + 10;
int x[N], suffmx[N];
ll d[N], g[N];
int main() {
	int n;
	scanf("%d", &n);
	vector <pair<ll, int>> v;
	v.push_back({ -2e9, 0 });
	for (int i = 1; i <= n; i++) {
		scanf("%d %lld %lld", &x[i], &g[i], &d[i]);
		d[i] += d[i - 1];
		g[i] += g[i - 1];
		v.push_back({ d[i] - x[i], i });
	}
	sort(v.begin(), v.end());
	for (int i = n; i >= 1; i--) {
		suffmx[i] = max(suffmx[i + 1], v[i].second);
	}
	ll answer = 0;
	for (int i = 1; i <= n; i++) {
		ll cur = d[i - 1] - x[i];
		int l = 1, r = n, ans = -1;
		while (l <= r) {
			int mid = (l + r) / 2;
			if (v[mid].first >= cur) {
				ans = mid;
				r = mid - 1;
			}
			else l = mid + 1;
		}
		answer = max(answer, g[suffmx[ans]] - g[i - 1]);
	}
	printf("%lld\n", answer);
}

Compilation message (stderr)

divide.cpp: In function 'int main()':
divide.cpp:13:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
divide.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |   scanf("%d %lld %lld", &x[i], &g[i], &d[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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