제출 #21835

#제출 시각아이디문제언어결과실행 시간메모리
21835ulnaDivide and conquer (IZhO14_divide)C++11
100 / 100
96 ms10572 KiB
#include <bits/stdc++.h>
using namespace std;

// why am I so weak

int n;
long long x[100055], g[100055], d[100055];

typedef pair<long long, int> P;

#define ft first
#define sd second

int main() {
	// sigma(ei ... ej) >= x[j] - x[i]
	// e[j] - e[i - 1] >= x[j] - x[i]
	// x[i] - e[i - 1] >= x[j] - e[j]
	
	scanf("%d", &n);

	for (int i = 0; i < n; i++) {
		scanf("%lld %lld %lld", &x[i], &g[i], &d[i]);

		if (i) {
			g[i] += g[i - 1];
			d[i] += d[i - 1];
		}
	}

	set<P> s;
	long long res = g[0];

	s.insert(P(x[0], 0));

	for (int i = 0; i < n; i++) {
		res = max(res, g[i] - g[i - 1]);

		{
			auto ite = s.lower_bound(P(x[i] - d[i], -1));

			if (ite != s.end()) {
				res = max(res, g[i] - (ite->sd == 0 ? 0ll : g[ite->sd - 1]));
			}
		}

		if (x[i] - d[i - 1] > s.rbegin()->ft) {
			s.insert(P(x[i] - d[i - 1], i));
		}
	}

	printf("%lld\n", res);
	
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

divide.cpp: In function 'int main()':
divide.cpp:19:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
divide.cpp:22:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld %lld", &x[i], &g[i], &d[i]);
                                               ^
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