Submission #241207

#	Time	Username	Problem	Language	Result	Execution time	Memory
241207		crossing0ver	Roller Coaster Railroad (IOI16_railroad)	C++17	0 / 100	2087 ms	5612 KiB

railroad

#include<bits/stdc++.h>
/*#pragma GCC optimize("03")
#pragma GCC target("avx,avx2")
#pragma GCC optimeze("unroll-loops") */
#define inf 10000000000000000  
#define ll long long 
#include "railroad.h"
using namespace std;
int n;
ll dp[16][16][1 << 16],cost[16][16];

ll small_case(vector<int> a,vector<int> b) {
	 n = a.size();
	for (int i = 0; i < n; i++) {
	for (int j = 0;j < n; j++) {
		if (b[i] > a[j] && j != i) cost[i][j] = b[i] - a[j];
	fill(dp[i][j],dp[i][j] + (1 << n),inf);
	}
	dp[i][i][(1 << i)] = 0;
	}
	for (int mask = 1; mask < (1 << n); mask++) 
	for (int i = 0; i < n; i++) {
		if ((1 << i) & mask) {
			for (int j = 0; j < n; j++) {
				if ( ((1 << j) & mask) && j != i) {
					for (int e = 0; e < n; e++) {
						if (e != j && dp[i][j][mask] > dp[i][e][mask^(1<<j)] + cost[e][j])
						dp[i][j][mask] = dp[i][e][mask^(1<<j)] + cost[e][j];
					}
				}
			}
		}
	}
	ll ans = inf;
	for (int i = 0; i < n; i++)
	for (int j = 0; j < n; j++)
		ans = min(ans,dp[i][j][(1<<n)-1]);
    return ans;
}

ll plan_roller_coaster(vector<int> a, vector<int> b) {
	n = a.size();
	//if (n <= 16) return small_case(a,b);
	vector<pair<int,int> > v;
	v.push_back({0,0});
	for (int i = 0;i < n; i++)	v.push_back({a[i],b[i]});
	int st = 1;
	v.push_back({1000000000,0});
	bool flag = 1;
	while (flag) {
		flag = 0;
		for (int i = st; i < n-1; i++) {
			int cost[2] = {0,0};
			for (int j = i; j <= i+2; j++) {
				if (v[j].first < v[j-1].second)
					cost[0] += v[j-1].second - v[j].first;
			}
			swap(v[i],v[i+1]);
			for (int j = i; j <= i+2; j++) {
				if (v[j].first < v[j-1].second)
					cost[1] += v[j-1].second - v[j].first;
			}
			if (cost[0] <= cost[1]) {
			swap(v[i],v[i+1]);
			flag = 1; 
			st = max(i-1,1);
			break;
			}
		}
		}
		ll ans = 0;
	for (int i = 2; i <= n; i++) {
		if (v[i].first < v[i-1].second) ans += v[i-1].second - v[i].first;
	}
	return ans;
}

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