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Submission #425442

# Submission time Handle Problem Language Result Execution time Memory
425442 2021-06-13T03:57:07 Z jk410 The Big Prize (IOI17_prize) C++17
100 / 100
 73 ms 5188 KB 
#include <bits/stdc++.h>
#include "prize.h"
using namespace std;
typedef vector<int> vi;
int N,M,Cnt=1,Max,Sum,Ans=-1;
vi ask_res[200000];
vi ask_query(int i){
    vi &r=ask_res[i];
    if (r.size())
        return r;
    return r=ask(i);
}
void find_not_candy(int s,int e){
    if (s>e)
        return;
    vi q=ask_query(e);
    if (q[0]+q[1]==Max&&Sum==q[0])
        return;
    int l=s,r=e,t;
    while (l<=r){
        int m=(l+r)>>1;
        q=ask_query(m);
        if (q[0]+q[1]==Max){
            if (Sum<q[0])
                r=m-1;
            else
                l=m+1;
        }
        else{
            t=m;
            r=m-1;
        }
    }
    q=ask_query(t);
    if (!q[0]&&!q[1]){
        Ans=t;
        return;
    }
    Sum++;
    find_not_candy(t+1,e);
}
int find_best(int n) {
    N=M=n;
    while (M!=1){
        int t=sqrt(M);
        if (t*(t+1)>M)
            t--;
        Cnt+=t;
        M=t;
    }
    for (int i=0; i<N; i+=N/Cnt){
        vi q=ask_query(min(N-1,i+N/Cnt-1));
        Max=max(Max,q[0]+q[1]);
    }
    for (int i=0; i<N; i+=N/Cnt){
        find_not_candy(i,min(N-1,i+N/Cnt-1));
        if (Ans!=-1)
            return Ans;
    }
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:60:1: warning: control reaches end of non-void function [-Wreturn-type]
   60 | }
      | ^
prize.cpp: In function 'void find_not_candy(int, int)':
prize.cpp:40:19: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |     find_not_candy(t+1,e);
      |     ~~~~~~~~~~~~~~^~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 4976 KB Output is correct
2 Correct 10 ms 4980 KB Output is correct
3 Correct 7 ms 4988 KB Output is correct
4 Correct 7 ms 4988 KB Output is correct
5 Correct 8 ms 4988 KB Output is correct
6 Correct 11 ms 4968 KB Output is correct
7 Correct 9 ms 4980 KB Output is correct
8 Correct 8 ms 4936 KB Output is correct
9 Correct 11 ms 4984 KB Output is correct
10 Correct 12 ms 4936 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 4936 KB Output is correct
2 Correct 7 ms 5072 KB Output is correct
3 Correct 11 ms 4972 KB Output is correct
4 Correct 8 ms 4936 KB Output is correct
5 Correct 13 ms 4980 KB Output is correct
6 Correct 10 ms 4976 KB Output is correct
7 Correct 9 ms 4984 KB Output is correct
8 Correct 8 ms 4936 KB Output is correct
9 Correct 9 ms 4984 KB Output is correct
10 Correct 11 ms 4984 KB Output is correct
11 Correct 12 ms 4976 KB Output is correct
12 Correct 14 ms 4972 KB Output is correct
13 Correct 15 ms 4976 KB Output is correct
14 Correct 7 ms 4936 KB Output is correct
15 Correct 16 ms 5112 KB Output is correct
16 Correct 57 ms 4976 KB Output is correct
17 Correct 9 ms 4980 KB Output is correct
18 Correct 41 ms 5112 KB Output is correct
19 Correct 10 ms 4980 KB Output is correct
20 Correct 18 ms 5056 KB Output is correct
21 Correct 35 ms 4936 KB Output is correct
22 Correct 14 ms 4936 KB Output is correct
23 Correct 8 ms 4988 KB Output is correct
24 Correct 12 ms 4976 KB Output is correct
25 Correct 43 ms 4980 KB Output is correct
26 Correct 20 ms 5084 KB Output is correct
27 Correct 10 ms 4936 KB Output is correct
28 Correct 52 ms 5088 KB Output is correct
29 Correct 55 ms 4984 KB Output is correct
30 Correct 70 ms 5188 KB Output is correct
31 Correct 12 ms 4980 KB Output is correct
32 Correct 12 ms 4976 KB Output is correct
33 Correct 4 ms 4936 KB Output is correct
34 Correct 22 ms 4972 KB Output is correct
35 Correct 7 ms 5080 KB Output is correct
36 Correct 29 ms 4968 KB Output is correct
37 Correct 11 ms 4972 KB Output is correct
38 Correct 6 ms 5072 KB Output is correct
39 Correct 36 ms 4936 KB Output is correct
40 Correct 62 ms 5056 KB Output is correct
41 Correct 32 ms 5104 KB Output is correct
42 Correct 32 ms 4980 KB Output is correct
43 Correct 17 ms 5140 KB Output is correct
44 Correct 34 ms 4976 KB Output is correct
45 Correct 33 ms 4980 KB Output is correct
46 Correct 7 ms 4992 KB Output is correct
47 Correct 37 ms 4936 KB Output is correct
48 Correct 48 ms 5056 KB Output is correct
49 Correct 11 ms 4976 KB Output is correct
50 Correct 44 ms 5036 KB Output is correct
51 Correct 20 ms 5016 KB Output is correct
52 Correct 11 ms 4936 KB Output is correct
53 Correct 10 ms 4936 KB Output is correct
54 Correct 35 ms 4976 KB Output is correct
55 Correct 10 ms 4936 KB Output is correct
56 Correct 64 ms 5156 KB Output is correct
57 Correct 48 ms 5112 KB Output is correct
58 Correct 48 ms 5052 KB Output is correct
59 Correct 44 ms 5056 KB Output is correct
60 Correct 45 ms 5116 KB Output is correct
61 Correct 10 ms 4964 KB Output is correct
62 Correct 12 ms 4936 KB Output is correct
63 Correct 11 ms 4964 KB Output is correct
64 Correct 9 ms 4976 KB Output is correct
65 Correct 18 ms 4972 KB Output is correct
66 Correct 24 ms 4972 KB Output is correct
67 Correct 10 ms 4976 KB Output is correct
68 Correct 17 ms 4972 KB Output is correct
69 Correct 23 ms 5016 KB Output is correct
70 Correct 8 ms 4936 KB Output is correct
71 Correct 45 ms 5012 KB Output is correct
72 Correct 16 ms 5012 KB Output is correct
73 Correct 70 ms 5056 KB Output is correct
74 Correct 60 ms 5108 KB Output is correct
75 Correct 8 ms 4992 KB Output is correct
76 Correct 59 ms 5004 KB Output is correct
77 Correct 64 ms 5188 KB Output is correct
78 Correct 7 ms 4992 KB Output is correct
79 Correct 31 ms 5032 KB Output is correct
80 Correct 71 ms 5112 KB Output is correct
81 Correct 63 ms 5112 KB Output is correct
82 Correct 66 ms 5004 KB Output is correct
83 Correct 10 ms 4936 KB Output is correct
84 Correct 44 ms 5008 KB Output is correct
85 Correct 40 ms 5124 KB Output is correct
86 Correct 65 ms 5056 KB Output is correct
87 Correct 13 ms 5008 KB Output is correct
88 Correct 43 ms 5168 KB Output is correct
89 Correct 58 ms 5152 KB Output is correct
90 Correct 13 ms 4936 KB Output is correct
91 Correct 40 ms 5132 KB Output is correct
92 Correct 48 ms 5060 KB Output is correct
93 Correct 73 ms 5056 KB Output is correct
94 Correct 25 ms 5100 KB Output is correct
95 Correct 33 ms 5156 KB Output is correct
96 Correct 37 ms 5088 KB Output is correct
97 Correct 52 ms 5064 KB Output is correct