Submission #550366

#	Time	Username	Problem	Language	Result	Execution time	Memory
550366		LucaDantas	Long Distance Coach (JOI17_coach)	C++17	71 / 100	46 ms	596 KiB

coach

#include <bits/stdc++.h>
using namespace std;

constexpr int maxn = 2010;

int nxt[maxn]; // next living guy after a water refill

long long X, N, M, W, T;

long long refill[maxn], time_person[maxn], kill_person[maxn], dp[maxn];

int main() {
	scanf("%lld %lld %lld %lld %lld", &X, &N, &M, &W, &T);
	for(int i = 1; i <= N; i++)
		scanf("%lld", &refill[i]);
	refill[++N] = X;

	for(int i = 1; i <= M; i++)
		scanf("%lld %lld", &time_person[i], &kill_person[i]);

	vector<pair<long long, long long>> tempos; // o tempo T é o fim
	for(int i = 1; i <= M; i++)
		tempos.push_back({time_person[i], kill_person[i]});
	sort(tempos.begin(), tempos.end());
	for(int i = 0; i < M; i++)
		time_person[i+1] = tempos[i].first, kill_person[i+1] = tempos[i].second;
	time_person[M+1] = T; // setto o valor do piloto

	for(int i = 1; i <= N; i++)
		nxt[i] = lower_bound(time_person+1, time_person+1+M, refill[i] % T) - time_person; // ID do proximo cara vivo dps de mim

	for(int i = 2; i <= M; i++)
		kill_person[i] += kill_person[i-1];

	auto qtd = [&](long long tempo) { return X / T + (tempo < X%T); };

	auto itv_kill = [&](int l, int r) { return kill_person[r] - kill_person[l-1]; };

	auto cost = [&](int l, int r, long long tempo) { return itv_kill(l, r) + (tempo / T) * W * (r-l+1); };

	dp[M+1] = W * (X/T + 1);
	for(int i = M; i >= 1; i--) {
		long long aq = 0x3f3f3f3f3f3f3f3f;

		// opção 1: uso alguem pra me matar
		for(int j = 1; j <= N; j++) {
			if(refill[j] % T < time_person[i]) continue;
			aq = min(aq, dp[nxt[j]] + cost(i, nxt[j]-1, refill[j]));
		}

		// opção 2: fico vivo até o final
		aq = min(aq, dp[i+1] + W * qtd(time_person[i]));

		dp[i] = aq;
	}

	printf("%lld\n", dp[1]);
}

Compilation message (stderr)

coach.cpp: In function 'int main()':
coach.cpp:13:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  scanf("%lld %lld %lld %lld %lld", &X, &N, &M, &W, &T);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
coach.cpp:15:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   scanf("%lld", &refill[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~
coach.cpp:19:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   scanf("%lld %lld", &time_person[i], &kill_person[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 0 / 29