Submission #1033899

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033899		juicy	Semiexpress (JOI17_semiexpress)	C++17	100 / 100	3 ms	488 KiB

semiexpress

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

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

	int N, M, K, A, B, C; long long T; 
	cin >> N >> M >> K >> A >> B >> C >> T;
	vector<int> S(M), pos(M, -1);
	for (int i = 0; i < M; ++i) {
		cin >> S[i];
		--S[i];
		long long X;
		if ((X = T - (long long) B * S[i]) >= 0) {
			pos[i] = min((long long) N, X / A);
		}
	}
	for (int i = 0; i + 1 < M; ++i) {
		pos[i] = min(pos[i], S[i + 1] - S[i] - 1);
	}
	pos[M - 1] = min(pos[M - 1], 0);
	int iter = K - M;
	while (iter--) {
		array<int, 2> best{0, 0};
		for (int i = 0; i + 1 < M; ++i) {
			long long X;
			if ((X = T - (long long) B * S[i] - (long long) C * (pos[i] + 1)) >= 0) {
				long long L = pos[i] + 1, R = min((long long) S[i + 1] - S[i] - 1, L + (X / A));
				best = max(best, {R - L + 1, i});
			}
		}
		pos[best[1]] += best[0];
	}
	cout << accumulate(pos.begin(), pos.end(), 0) + M - 1;
	return 0;
}

// what a "beautiful" problem!

Compilation message (stderr)

semiexpress.cpp: In function 'int main()':
semiexpress.cpp:36:29: warning: narrowing conversion of '((R - L) + 1)' from 'long long int' to 'int' [-Wnarrowing]
   36 |     best = max(best, {R - L + 1, i});
      |                       ~~~~~~^~~

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 52 / 52