Submission #286932

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
286932	2020-08-31T07:28:29 Z	andreiomd	The Big Prize (IOI17_prize)	C++11	96.58 / 100	69 ms	1016 KB

prize

#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

typedef pair < int, int > PII;

int N;
int Candy_Sum = 0;

unordered_map < int, bool > Sel;
unordered_map < int, pair < int, int > > mp;

///
inline PII Get_Ans (int pos)
{
    if(Sel[pos])
        return mp[pos];

    vector < int > res = ask(pos);

    Sel[pos] = 1, mp[pos] = {res[0], res[1]};

    return {res[0], res[1]};
}

inline bool IsDiamond (PII X)
{
    return ((X.first + X.second) == 0);
}

inline bool IsCandy (PII X)
{
    return ((X.first + X.second) == Candy_Sum);
}
///

inline int Go (int Left, int Right)
{
    if(Left > Right)
        return 0;

    if(Left == Right)
        return Left;

    int Mid = ((Left + Right) >> 1);
    PII Now = Get_Ans(Mid);

    if(IsDiamond(Now))
        return Mid;

    if(Now.first)
        return Go(Left, Mid - 1);

    return Go(Mid + 1, Right);
}

inline int F (int Left, int Right, int less_to_left, int less_to_right)
{
    if(Left > Right)
        return 0;

    if(Left == Right)
    {
        if(IsDiamond(Get_Ans(Left)))
            return Left;

        return 0;
    }

    int Mid = ((Left + Right) >> 1);
    PII Now = Get_Ans(Mid);

    if(IsDiamond(Now))
        return Mid;

    int i = Mid - 1, j = Mid + 1, pos = 0;
    bool found = 0;

    if(IsCandy(Now))
        found = 1, pos = Mid;

    ///
    while(!found && (i >= Left || j <= Right))
    {
        if(i >= Left)
        {
            PII curr = Get_Ans(i);

            if(IsDiamond(curr))
                return i;

            if(!IsCandy(curr))
                --i;
            else
            {
                found = 1, pos = i, Now = curr;

                break;
            }
        }

        if(j <= Right)
        {
            PII curr = Get_Ans(j);

            if(IsDiamond(curr))
                return j;

            if(!IsCandy(curr))
                ++j;
            else
            {
                found = 1, pos = j, Now = curr;

                break;
            }
        }
    }
    ///

    if(!found)
        return 0;

    Mid = pos;

    int ans = 0;

    int ext_left = Now.first - less_to_left;
    int ext_right = Now.second - less_to_right;

    if(!ext_left && !ext_right)
        return 0;

    if(ext_left && ext_right)
    {
        if(ext_left > ext_right)
        {
            ans = F(Left, Mid - 1, less_to_left, Now.second);

            if(!ans)
                ans = F(Mid + 1, Right, Now.first, less_to_right);
        }
        else
        {
            ans = F(Mid + 1, Right, Now.first, less_to_right);

            if(!ans)
                ans = F(Left, Mid - 1, less_to_left, Now.second);
        }
    }
    else
    {
        if(ext_left)
            ans = F(Left, Mid - 1, less_to_left, Now.second);
        else
            ans = F(Mid + 1, Right, Now.first, less_to_right);
    }

    return ans;
}

int find_best(int n)
{
    N = n;

    for(int i = 0; i < min(N, 476); ++i)
    {
        PII Now = Get_Ans(i);

        if(IsDiamond(Now))
            return i;

        Candy_Sum = max(Candy_Sum, Now.first + Now.second);
    }

    if(Candy_Sum == 1)
        return Go(0, N - 1);

    return F(0, N - 1, 0, 0);
}

Subtask #1

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	5 ms	384 KB	Output is correct
3	Correct	5 ms	384 KB	Output is correct
4	Correct	3 ms	400 KB	Output is correct
5	Correct	7 ms	384 KB	Output is correct
6	Correct	0 ms	256 KB	Output is correct
7	Correct	5 ms	384 KB	Output is correct
8	Correct	5 ms	376 KB	Output is correct
9	Correct	5 ms	384 KB	Output is correct
10	Correct	6 ms	384 KB	Output is correct

Subtask #2

76.58 / 80.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	416 KB	Output is correct
2	Correct	4 ms	376 KB	Output is correct
3	Correct	5 ms	384 KB	Output is correct
4	Correct	3 ms	396 KB	Output is correct
5	Correct	5 ms	384 KB	Output is correct
6	Correct	1 ms	256 KB	Output is correct
7	Correct	5 ms	384 KB	Output is correct
8	Correct	5 ms	384 KB	Output is correct
9	Correct	6 ms	384 KB	Output is correct
10	Correct	5 ms	384 KB	Output is correct
11	Correct	5 ms	416 KB	Output is correct
12	Correct	6 ms	428 KB	Output is correct
13	Correct	6 ms	384 KB	Output is correct
14	Correct	11 ms	384 KB	Output is correct
15	Correct	19 ms	504 KB	Output is correct
16	Correct	22 ms	504 KB	Output is correct
17	Correct	4 ms	376 KB	Output is correct
18	Correct	22 ms	632 KB	Output is correct
19	Correct	6 ms	384 KB	Output is correct
20	Correct	19 ms	508 KB	Output is correct
21	Correct	8 ms	500 KB	Output is correct
22	Correct	11 ms	492 KB	Output is correct
23	Correct	6 ms	384 KB	Output is correct
24	Correct	8 ms	384 KB	Output is correct
25	Correct	22 ms	504 KB	Output is correct
26	Correct	20 ms	504 KB	Output is correct
27	Correct	6 ms	384 KB	Output is correct
28	Correct	17 ms	376 KB	Output is correct
29	Correct	17 ms	504 KB	Output is correct
30	Correct	17 ms	512 KB	Output is correct
31	Correct	5 ms	376 KB	Output is correct
32	Correct	6 ms	384 KB	Output is correct
33	Correct	1 ms	256 KB	Output is correct
34	Correct	5 ms	428 KB	Output is correct
35	Correct	7 ms	384 KB	Output is correct
36	Correct	20 ms	632 KB	Output is correct
37	Correct	5 ms	428 KB	Output is correct
38	Correct	3 ms	408 KB	Output is correct
39	Correct	39 ms	632 KB	Output is correct
40	Correct	12 ms	376 KB	Output is correct
41	Correct	26 ms	504 KB	Output is correct
42	Correct	23 ms	504 KB	Output is correct
43	Correct	9 ms	416 KB	Output is correct
44	Correct	12 ms	464 KB	Output is correct
45	Correct	11 ms	556 KB	Output is correct
46	Correct	5 ms	376 KB	Output is correct
47	Correct	17 ms	500 KB	Output is correct
48	Correct	8 ms	504 KB	Output is correct
49	Correct	13 ms	568 KB	Output is correct
50	Correct	26 ms	504 KB	Output is correct
51	Correct	14 ms	376 KB	Output is correct
52	Partially correct	29 ms	944 KB	Partially correct - number of queries: 5212
53	Correct	7 ms	376 KB	Output is correct
54	Correct	8 ms	384 KB	Output is correct
55	Correct	6 ms	384 KB	Output is correct
56	Correct	20 ms	504 KB	Output is correct
57	Correct	31 ms	564 KB	Output is correct
58	Correct	37 ms	504 KB	Output is correct
59	Correct	20 ms	504 KB	Output is correct
60	Correct	28 ms	504 KB	Output is correct
61	Correct	5 ms	384 KB	Output is correct
62	Correct	8 ms	384 KB	Output is correct
63	Correct	5 ms	384 KB	Output is correct
64	Correct	7 ms	376 KB	Output is correct
65	Correct	4 ms	376 KB	Output is correct
66	Correct	12 ms	384 KB	Output is correct
67	Correct	6 ms	384 KB	Output is correct
68	Correct	4 ms	384 KB	Output is correct
69	Correct	9 ms	376 KB	Output is correct
70	Correct	9 ms	384 KB	Output is correct
71	Partially correct	52 ms	888 KB	Partially correct - number of queries: 5234
72	Correct	8 ms	384 KB	Output is correct
73	Partially correct	55 ms	760 KB	Partially correct - number of queries: 5171
74	Partially correct	44 ms	860 KB	Partially correct - number of queries: 5198
75	Correct	5 ms	532 KB	Output is correct
76	Correct	58 ms	764 KB	Output is correct
77	Partially correct	48 ms	760 KB	Partially correct - number of queries: 5342
78	Correct	10 ms	384 KB	Output is correct
79	Correct	29 ms	512 KB	Output is correct
80	Partially correct	30 ms	768 KB	Partially correct - number of queries: 5338
81	Partially correct	49 ms	888 KB	Partially correct - number of queries: 5337
82	Partially correct	36 ms	1016 KB	Partially correct - number of queries: 5297
83	Correct	9 ms	512 KB	Output is correct
84	Correct	53 ms	772 KB	Output is correct
85	Partially correct	69 ms	868 KB	Partially correct - number of queries: 5320
86	Correct	7 ms	384 KB	Output is correct
87	Correct	3 ms	368 KB	Output is correct
88	Correct	3 ms	392 KB	Output is correct
89	Correct	5 ms	384 KB	Output is correct
90	Correct	5 ms	384 KB	Output is correct
91	Correct	5 ms	384 KB	Output is correct
92	Correct	3 ms	384 KB	Output is correct
93	Correct	8 ms	384 KB	Output is correct
94	Correct	9 ms	384 KB	Output is correct
95	Correct	10 ms	384 KB	Output is correct
96	Correct	8 ms	384 KB	Output is correct
97	Correct	5 ms	384 KB	Output is correct