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Submission #976873

# Submission time Handle Problem Language Result Execution time Memory
976873 2024-05-07T08:18:38 Z LucaIlie The Big Prize (IOI17_prize) C++17
100 / 100
 28 ms 2144 KB 
#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 2e5;
int ans[MAX_N][2];

int n, t;
bool found = false;
int pos;

pair<int, int> askk( int i ) {
    if ( i < 0 || i >= n )
        return { -1, -1 };

    if ( ans[i][0] == -1 ) {
        auto x = ask( i );
        ans[i][0] = x[0];
        ans[i][1] = x[1];
    }

    if ( ans[i][0] + ans[i][1] == 0 ) {
        found = true;
        pos = i;
    }

    return { ans[i][0], ans[i][1] };
}

int findMid( int &l, int &r ) {
    if ( l > r )
        return r;


    int mid = (l + r) / 2;
    while ( mid <= r && askk( mid ).first + askk( mid ).second != t && !found )
        mid++;

    if ( mid >= r ) {
        mid--;
        while ( mid >= l && askk( mid ).first + askk( mid ).second != t && !found )
            mid--;
        r = mid;
        return findMid( l, r );
    }
    return mid;
}

void solve( int l, int r, int tleft, int tright ) {
    if ( tleft == tright )
        return;

    if ( found )
        return;

    if ( l > r )
        return;

    //printf( "%d %d\n", l, r );

    int lmid = (l + r) / 2;
    while ( lmid >= l && askk( lmid ).first + askk( lmid ).second != t && !found )
        lmid--;
    int tlmid = askk( lmid ).first;

    int rmid = (l + r) / 2;
    while ( rmid <= r && askk( rmid ).first + askk( rmid ).second != t && !found )
        rmid++;
    int trmid = askk( rmid ).first;


    solve( l, lmid, tleft, tlmid );
    solve( rmid + 1, r, trmid, tright );
}

int find_best( int N ) {
    n = N;

    for ( int i = 0; i < n; i++ )
        ans[i][0] = ans[i][1] = -1;

    t = 0;
    for ( int i = 0; i < 100; i++ ) {
        int p = rand() % n;
        t = max( t, askk( p ).first + askk( p ).second );
    }

    solve( 0, n - 1, 0, t );

    // for ( int i = 0; i < n; i++ )
    //   askk( i );

    return pos;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1880 KB Output is correct
2 Correct 1 ms 1880 KB Output is correct
3 Correct 1 ms 1880 KB Output is correct
4 Correct 2 ms 1880 KB Output is correct
5 Correct 2 ms 1880 KB Output is correct
6 Correct 2 ms 1880 KB Output is correct
7 Correct 1 ms 1880 KB Output is correct
8 Correct 2 ms 1880 KB Output is correct
9 Correct 2 ms 1880 KB Output is correct
10 Correct 1 ms 1880 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1880 KB Output is correct
2 Correct 2 ms 1880 KB Output is correct
3 Correct 1 ms 1880 KB Output is correct
4 Correct 2 ms 1880 KB Output is correct
5 Correct 2 ms 1880 KB Output is correct
6 Correct 2 ms 2132 KB Output is correct
7 Correct 1 ms 1880 KB Output is correct
8 Correct 2 ms 1880 KB Output is correct
9 Correct 2 ms 1880 KB Output is correct
10 Correct 1 ms 1880 KB Output is correct
11 Correct 2 ms 1880 KB Output is correct
12 Correct 2 ms 1880 KB Output is correct
13 Correct 3 ms 1880 KB Output is correct
14 Correct 2 ms 600 KB Output is correct
15 Correct 4 ms 2136 KB Output is correct
16 Correct 25 ms 2136 KB Output is correct
17 Correct 1 ms 1876 KB Output is correct
18 Correct 22 ms 1880 KB Output is correct
19 Correct 2 ms 1880 KB Output is correct
20 Correct 5 ms 1112 KB Output is correct
21 Correct 10 ms 1880 KB Output is correct
22 Correct 3 ms 1880 KB Output is correct
23 Correct 1 ms 1876 KB Output is correct
24 Correct 2 ms 2132 KB Output is correct
25 Correct 13 ms 2132 KB Output is correct
26 Correct 13 ms 1880 KB Output is correct
27 Correct 2 ms 1880 KB Output is correct
28 Correct 19 ms 1880 KB Output is correct
29 Correct 17 ms 1880 KB Output is correct
30 Correct 21 ms 1880 KB Output is correct
31 Correct 2 ms 1880 KB Output is correct
32 Correct 3 ms 1880 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 6 ms 1968 KB Output is correct
35 Correct 2 ms 1880 KB Output is correct
36 Correct 6 ms 1880 KB Output is correct
37 Correct 2 ms 1880 KB Output is correct
38 Correct 1 ms 1976 KB Output is correct
39 Correct 11 ms 1880 KB Output is correct
40 Correct 21 ms 1880 KB Output is correct
41 Correct 12 ms 1880 KB Output is correct
42 Correct 11 ms 1880 KB Output is correct
43 Correct 17 ms 1880 KB Output is correct
44 Correct 8 ms 1880 KB Output is correct
45 Correct 9 ms 1880 KB Output is correct
46 Correct 2 ms 1880 KB Output is correct
47 Correct 10 ms 1880 KB Output is correct
48 Correct 20 ms 1880 KB Output is correct
49 Correct 3 ms 1880 KB Output is correct
50 Correct 21 ms 1880 KB Output is correct
51 Correct 8 ms 2136 KB Output is correct
52 Correct 2 ms 1880 KB Output is correct
53 Correct 2 ms 1876 KB Output is correct
54 Correct 9 ms 1880 KB Output is correct
55 Correct 2 ms 1880 KB Output is correct
56 Correct 22 ms 1880 KB Output is correct
57 Correct 15 ms 1880 KB Output is correct
58 Correct 18 ms 1880 KB Output is correct
59 Correct 11 ms 1880 KB Output is correct
60 Correct 12 ms 1880 KB Output is correct
61 Correct 2 ms 2132 KB Output is correct
62 Correct 1 ms 1880 KB Output is correct
63 Correct 2 ms 1880 KB Output is correct
64 Correct 2 ms 1880 KB Output is correct
65 Correct 2 ms 1880 KB Output is correct
66 Correct 3 ms 2136 KB Output is correct
67 Correct 2 ms 1880 KB Output is correct
68 Correct 4 ms 1880 KB Output is correct
69 Correct 3 ms 1880 KB Output is correct
70 Correct 2 ms 2136 KB Output is correct
71 Correct 28 ms 1880 KB Output is correct
72 Correct 3 ms 1880 KB Output is correct
73 Correct 23 ms 1880 KB Output is correct
74 Correct 24 ms 1880 KB Output is correct
75 Correct 2 ms 1880 KB Output is correct
76 Correct 19 ms 1880 KB Output is correct
77 Correct 23 ms 2132 KB Output is correct
78 Correct 3 ms 1880 KB Output is correct
79 Correct 15 ms 2136 KB Output is correct
80 Correct 26 ms 1880 KB Output is correct
81 Correct 26 ms 1880 KB Output is correct
82 Correct 23 ms 1880 KB Output is correct
83 Correct 2 ms 1880 KB Output is correct
84 Correct 17 ms 1880 KB Output is correct
85 Correct 28 ms 2144 KB Output is correct
86 Correct 8 ms 2136 KB Output is correct
87 Correct 3 ms 1880 KB Output is correct
88 Correct 8 ms 2136 KB Output is correct
89 Correct 8 ms 2136 KB Output is correct
90 Correct 2 ms 1880 KB Output is correct
91 Correct 7 ms 1880 KB Output is correct
92 Correct 7 ms 1880 KB Output is correct
93 Correct 3 ms 1880 KB Output is correct
94 Correct 3 ms 1880 KB Output is correct
95 Correct 3 ms 1880 KB Output is correct
96 Correct 2 ms 1880 KB Output is correct
97 Correct 2 ms 1880 KB Output is correct