Submission #789912

#	Time	Username	Problem	Language	Result	Execution time	Memory
789912		Shithila	Roller Coaster Railroad (IOI16_railroad)	C++14	64 / 100	66 ms	11080 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    int n = (int) s.size();
    if(n<17)
    {
    	vector<vector<long long>> dp((1<<n), vector<long long>(n,1e16));
   	long long kk=1;
   	int kkpos=0;
   	while(kkpos<n)
   	{
   		dp[kk][kkpos]=0;
   		kk=kk*2;
   		kkpos++;
	}
	for(int i=0;i<(1<<n);i++)
	{
		for(int j=0;j<n;j++)
		{
			if(((1<<j) & i)==0)
			{
				for(int k=0;k<n;k++)
				{
					if(((1<<k) & i)!=0)
					{
						long long distance=max((t[k]-s[j]),0);
						dp[i | (1<<j)][j]=min(dp[i | (1<<j)][j],(dp[i][k] + distance));
					}
				}
			}
		}
	}
	long long minnimum=1e16;
	for(int j=0;j<n;j++)
	{
		minnimum=min(minnimum,dp[(1<<n) - 1][j]);
	}
	return minnimum;
	}
   	vector<pair<int,int>> ss,tt;
   	for(int i=0;i<n;i++)
   	{
   		 tt.push_back({t[i], i});
        ss.push_back({s[i], i});
	}
	sort(ss.rbegin(), ss.rend());
    sort(tt.rbegin(), tt.rend());
    int i=0;
    int j=1;
    while(j<n)
    {
    	if(ss[i].second != tt[j].second)
        {
            if(tt[j].first > ss[i].first)
                return 999;
        }
        else if(i != n - 1)
        {
            if(tt[j].first > ss[i + 1].first)
                return 999;
        }
        
        i++, j++;
	}
	return 0;
}

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