Submission #302136

#	Time	Username	Problem	Language	Result	Execution time	Memory
302136		JPN20	Roller Coaster Railroad (IOI16_railroad)	C++17	34 / 100	90 ms	17144 KiB

railroad

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

long long N;
long long S[1 << 18], T[1 << 18];
long long dp[1 << 16][16];

long long plan_roller_coaster(vector<int> s, vector<int> t) {
	N = s.size();
	for (int i = 0; i < N; i++) S[i] = s[i];
	for (int i = 0; i < N; i++) T[i] = t[i];
	
	// PRCLC
	for (int i = 0; i < (1 << N); i++) {
		for (int j = 0; j < N; j++) dp[i][j] = (1LL << 60);
	}
	for (int i = 0; i < N; i++) dp[1 << i][i] = 0;
	
	// CALC
	for (int i = 0; i < (1 << N); i++) {
		for (int j = 0; j < N; j++) {
			if (dp[i][j] == (1LL << 60)) continue;
			for (int k = 0; k < N; k++) {
				if ((i / (1 << k)) % 2 == 1) continue;
				long long cost = max(0LL, T[j] - S[k]);
				dp[i + (1 << k)][k] = min(dp[i + (1 << k)][k], dp[i][j] + cost);
			}
		}
	}
	
	// FINAL
	long long Answer = (1LL << 60);
	for (int i = 0; i < N; i++) Answer = min(Answer, dp[(1 << N) - 1][i]);
	return Answer;
}

• Subtask 1: 11 / 11
• Subtask 2: 23 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36