Submission #125855

#	Time	Username	Problem	Language	Result	Execution time	Memory
125855		Sorting	Roller Coaster Railroad (IOI16_railroad)	C++14	0 / 100	84 ms	13844 KiB

railroad

#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 7;
const int M = (1 << 16) + 7;
const long long inf = 1e18 + 7;

pair<long long, bool> dp[M][19];
int n;
pair<int, int> p[N];

long long solve(int state, int pr = 17){
	if(dp[state][pr].second){
		return dp[state][pr].first;
	}
	if(state == (1 << n) - 1){
		return 0;
	}

	dp[state][pr].second = true;
	dp[state][pr].first = inf;

	long long curr;

	if(pr == 17){
		curr = 1;
	}
	else{
		curr = p[pr].second;
	}

	for(int i = 0; i < n; i++){
		if((1 << i) & state){
			continue;
		}

		dp[state][pr].first = min(dp[state][pr].first, solve(state | (1 << i), p[i].second) + max(curr - p[i].first, 0ll));
	}

	return dp[state][pr].first;
}

long long plan_roller_coaster(vector<int> s, vector<int> t){
	n = (int)s.size();

	for(int i = 0; i < n; i++){
		p[i] = {s[i], t[i]};
	}

	return solve(0);
}

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