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Submission #64967

# Submission time Handle Problem Language Result Execution time Memory
64967 2018-08-06T09:36:15 Z FedericoS Roller Coaster Railroad (IOI16_railroad) C++14
34 / 100
 505 ms 51800 KB 
#include "railroad.h"
#include <iostream>
#include <assert.h>
#include <queue>
#include <utility>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> pll;

int N;
ll ans=1e18;
ll S[1000006],T[1000006];
ll DP[1000006][20];
priority_queue<pll> PQS,PQT;
bool V[1000006];

ll F(int b, int i){

    assert(b&(1<<i));

	if(DP[b][i]!=-1)
		return DP[b][i];

	b=b^(1<<i);

	if(!b)
		return 0;

	ll res=1e18;
	for(int j=0;j<N;j++)
		if(b&(1<<j) and j!=i)
			res=min(res,F(b,j)+max(0LL,T[j]-S[i]));

	DP[b|(1<<i)][i]=res;
	return res;

}

long long plan_roller_coaster(std::vector<int> s, std::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];

    if(N>16){

        for(int i=0;i<N;i++){
            PQS.push({S[i],i});
            PQT.push({T[i],i});
        }

        S[N]=1e18;
        T[N]=-1;
        PQS.push({S[N],N});
        PQT.push({T[N],N});

        int cont=N+1,x,y;
        while(!PQS.empty() and !PQT.empty()){

            while(V[PQT.top().second] and !PQT.empty())
                PQT.pop();
            while(V[PQS.top().second] and !PQS.empty() and PQS.top().second!=PQT.top().second)
                PQS.pop();

            if(PQS.empty() or PQT.empty())
                return 0;

            x=PQT.top().second;
            y=PQS.top().second;

            if(T[x]<=S[y]){
                V[x]=true;
                V[y]=true;
                S[cont]=S[x];
                T[cont]=T[y];
                PQS.push({S[cont],cont});
                PQT.push({T[cont],cont});
                cont++;
            }
            else
                return 1;
        }
        return 0;
    }

	int b=(1<<N)-1;

	for(int i=0;i<N;i++)
		for(int j=0;j<=b;j++)
			DP[j][i]=-1;

	for(int i=0;i<N;i++)
		ans=min(ans,F(b,i));

	return ans;

}
/*
4
1 3
3 7
10 10
20 2
*/

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB n = 2
2 Correct 2 ms 436 KB n = 2
3 Correct 2 ms 436 KB n = 2
4 Correct 2 ms 620 KB n = 2
5 Correct 2 ms 640 KB n = 2
6 Correct 2 ms 640 KB n = 2
7 Correct 2 ms 696 KB n = 3
8 Correct 2 ms 696 KB n = 3
9 Correct 2 ms 696 KB n = 3
10 Correct 2 ms 696 KB n = 8
11 Correct 2 ms 696 KB n = 8
12 Correct 2 ms 696 KB n = 8
13 Correct 2 ms 696 KB n = 8
14 Correct 3 ms 696 KB n = 8
15 Correct 3 ms 696 KB n = 8
16 Correct 9 ms 696 KB n = 8
17 Correct 2 ms 696 KB n = 8
18 Correct 2 ms 696 KB n = 8
19 Correct 2 ms 696 KB n = 3
20 Correct 3 ms 696 KB n = 7
21 Correct 3 ms 696 KB n = 8
22 Correct 2 ms 696 KB n = 8
23 Correct 2 ms 696 KB n = 8
24 Correct 2 ms 696 KB n = 8
25 Correct 3 ms 696 KB n = 8

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB n = 2
2 Correct 2 ms 436 KB n = 2
3 Correct 2 ms 436 KB n = 2
4 Correct 2 ms 620 KB n = 2
5 Correct 2 ms 640 KB n = 2
6 Correct 2 ms 640 KB n = 2
7 Correct 2 ms 696 KB n = 3
8 Correct 2 ms 696 KB n = 3
9 Correct 2 ms 696 KB n = 3
10 Correct 2 ms 696 KB n = 8
11 Correct 2 ms 696 KB n = 8
12 Correct 2 ms 696 KB n = 8
13 Correct 2 ms 696 KB n = 8
14 Correct 3 ms 696 KB n = 8
15 Correct 3 ms 696 KB n = 8
16 Correct 9 ms 696 KB n = 8
17 Correct 2 ms 696 KB n = 8
18 Correct 2 ms 696 KB n = 8
19 Correct 2 ms 696 KB n = 3
20 Correct 3 ms 696 KB n = 7
21 Correct 3 ms 696 KB n = 8
22 Correct 2 ms 696 KB n = 8
23 Correct 2 ms 696 KB n = 8
24 Correct 2 ms 696 KB n = 8
25 Correct 3 ms 696 KB n = 8
26 Correct 2 ms 696 KB n = 8
27 Correct 3 ms 696 KB n = 8
28 Correct 3 ms 696 KB n = 8
29 Correct 127 ms 10912 KB n = 16
30 Correct 131 ms 10912 KB n = 16
31 Correct 99 ms 10912 KB n = 16
32 Correct 129 ms 10912 KB n = 16
33 Correct 125 ms 10912 KB n = 16
34 Correct 131 ms 10916 KB n = 16
35 Correct 131 ms 10916 KB n = 16
36 Correct 44 ms 10916 KB n = 15
37 Correct 3 ms 10916 KB n = 8
38 Correct 115 ms 10936 KB n = 16
39 Correct 100 ms 10936 KB n = 16
40 Correct 3 ms 10936 KB n = 9
41 Correct 116 ms 11004 KB n = 16
42 Correct 114 ms 11004 KB n = 16
43 Correct 101 ms 11004 KB n = 16
44 Correct 3 ms 11004 KB n = 9
45 Correct 47 ms 11004 KB n = 15
46 Correct 102 ms 11012 KB n = 16
47 Correct 101 ms 11012 KB n = 16
48 Correct 100 ms 11012 KB n = 16

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 505 ms 51800 KB answer is not correct: 1 instead of 0
2 Halted 0 ms 0 KB -

Subtask #4
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB n = 2
2 Correct 2 ms 436 KB n = 2
3 Correct 2 ms 436 KB n = 2
4 Correct 2 ms 620 KB n = 2
5 Correct 2 ms 640 KB n = 2
6 Correct 2 ms 640 KB n = 2
7 Correct 2 ms 696 KB n = 3
8 Correct 2 ms 696 KB n = 3
9 Correct 2 ms 696 KB n = 3
10 Correct 2 ms 696 KB n = 8
11 Correct 2 ms 696 KB n = 8
12 Correct 2 ms 696 KB n = 8
13 Correct 2 ms 696 KB n = 8
14 Correct 3 ms 696 KB n = 8
15 Correct 3 ms 696 KB n = 8
16 Correct 9 ms 696 KB n = 8
17 Correct 2 ms 696 KB n = 8
18 Correct 2 ms 696 KB n = 8
19 Correct 2 ms 696 KB n = 3
20 Correct 3 ms 696 KB n = 7
21 Correct 3 ms 696 KB n = 8
22 Correct 2 ms 696 KB n = 8
23 Correct 2 ms 696 KB n = 8
24 Correct 2 ms 696 KB n = 8
25 Correct 3 ms 696 KB n = 8
26 Correct 2 ms 696 KB n = 8
27 Correct 3 ms 696 KB n = 8
28 Correct 3 ms 696 KB n = 8
29 Correct 127 ms 10912 KB n = 16
30 Correct 131 ms 10912 KB n = 16
31 Correct 99 ms 10912 KB n = 16
32 Correct 129 ms 10912 KB n = 16
33 Correct 125 ms 10912 KB n = 16
34 Correct 131 ms 10916 KB n = 16
35 Correct 131 ms 10916 KB n = 16
36 Correct 44 ms 10916 KB n = 15
37 Correct 3 ms 10916 KB n = 8
38 Correct 115 ms 10936 KB n = 16
39 Correct 100 ms 10936 KB n = 16
40 Correct 3 ms 10936 KB n = 9
41 Correct 116 ms 11004 KB n = 16
42 Correct 114 ms 11004 KB n = 16
43 Correct 101 ms 11004 KB n = 16
44 Correct 3 ms 11004 KB n = 9
45 Correct 47 ms 11004 KB n = 15
46 Correct 102 ms 11012 KB n = 16
47 Correct 101 ms 11012 KB n = 16
48 Correct 100 ms 11012 KB n = 16
49 Incorrect 505 ms 51800 KB answer is not correct: 1 instead of 0
50 Halted 0 ms 0 KB -