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Submission #966357

# Submission time Handle Problem Language Result Execution time Memory
966357 2024-04-19T18:05:35 Z bachhoangxuan The Big Prize (IOI17_prize) C++17
20 / 100
 36 ms 7212 KB 
#include "prize.h"
#include<bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand_int(int l,int r){
    return l+(int)(rng()%(r-l+1));
}
const int B = 512;
const int maxn = 2e5+5;

vector<int> res[maxn];
vector<int> get(int x){
    if(!res[x].empty()) return res[x];
    res[x]=ask(x);res[x][1]+=res[x][0];
    return res[x];
}

int N,bit[maxn],Max;
void update(int x){
    for(int i=x+1;i<=N;i+=(i&(-i))) bit[i]++;
}
int query(int x){
    int ans=0;
    for(int i=x+1;i>=1;i-=(i&(-i))) ans+=bit[i];
    return ans;
}

int find_best(int n){
    N=n;
    if(rand_int(0,1)){
        for(int i=0;i<400;i++){
            int pos=rand_int(0,n-1);
            vector<int> cc=get(pos);
            if(cc[1]==0) return pos;
            Max=max(Max,cc[1]);
        }
    }else{
        for(int i=0;i<475;i++){
            vector<int> cc=get(i);
            if(cc[1]==0) return i;
            Max=max(Max,cc[1]);
        }
    }
    for(int i=0;i<n;i+=B){
        vector<int> p;
        for(int j=i;j<min(i+B,n);j++) p.push_back(j);
        int cnt=0;
        while(!p.empty()){
            int x=p.back();p.pop_back();
            vector<int> cc=get(x);
            if(cc[1]==0) return x;
            if(cc[1]<Max) update(x);
            else{
                cnt=cc[0]-query(x);
                break;
            }
        }
        while(cnt){
            int l=0,r=(int)p.size()-1;
            bool check=false;
            while(l<=r){
                int mid=(l+r)>>1;
                vector<int> cc=get(p[mid]);
                if(cc[1]==0) return p[mid];
                if(cc[1]<Max){
                    update(p[mid]);
                    p.erase(p.begin()+mid);
                    check=true;
                    break;
                }
                if(cc[0]-query(p[mid])) r=mid-1;
                else l=mid+1;
            }
            cnt--;
        }
    }
	return -1;
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:60:18: warning: variable 'check' set but not used [-Wunused-but-set-variable]
   60 |             bool check=false;
      |                  ^~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5756 KB Output is correct
2 Correct 4 ms 6016 KB Output is correct
3 Correct 4 ms 5776 KB Output is correct
4 Correct 6 ms 5748 KB Output is correct
5 Correct 4 ms 6256 KB Output is correct
6 Correct 4 ms 6016 KB Output is correct
7 Correct 5 ms 6012 KB Output is correct
8 Correct 5 ms 6012 KB Output is correct
9 Correct 4 ms 6020 KB Output is correct
10 Correct 5 ms 5772 KB Output is correct

Subtask #2
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6012 KB Output is correct
2 Correct 5 ms 6268 KB Output is correct
3 Correct 5 ms 6004 KB Output is correct
4 Correct 6 ms 6028 KB Output is correct
5 Correct 7 ms 5920 KB Output is correct
6 Correct 1 ms 5720 KB Output is correct
7 Correct 5 ms 6024 KB Output is correct
8 Correct 5 ms 6272 KB Output is correct
9 Correct 7 ms 6024 KB Output is correct
10 Correct 6 ms 6028 KB Output is correct
11 Correct 5 ms 6308 KB Output is correct
12 Correct 4 ms 6260 KB Output is correct
13 Correct 6 ms 5840 KB Output is correct
14 Correct 5 ms 5752 KB Output is correct
15 Correct 6 ms 6320 KB Output is correct
16 Correct 21 ms 6724 KB Output is correct
17 Correct 3 ms 6012 KB Output is correct
18 Correct 23 ms 6444 KB Output is correct
19 Correct 4 ms 6008 KB Output is correct
20 Correct 7 ms 6580 KB Output is correct
21 Correct 10 ms 6596 KB Output is correct
22 Correct 5 ms 6316 KB Output is correct
23 Correct 5 ms 6020 KB Output is correct
24 Correct 4 ms 6012 KB Output is correct
25 Correct 12 ms 6876 KB Output is correct
26 Correct 13 ms 5760 KB Output is correct
27 Correct 5 ms 6520 KB Output is correct
28 Correct 20 ms 6504 KB Output is correct
29 Correct 17 ms 7212 KB Output is correct
30 Correct 20 ms 6352 KB Output is correct
31 Correct 3 ms 6260 KB Output is correct
32 Correct 6 ms 6052 KB Output is correct
33 Correct 1 ms 5720 KB Output is correct
34 Correct 8 ms 6436 KB Output is correct
35 Correct 5 ms 6028 KB Output is correct
36 Correct 7 ms 6332 KB Output is correct
37 Correct 4 ms 6052 KB Output is correct
38 Correct 3 ms 6008 KB Output is correct
39 Correct 11 ms 6864 KB Output is correct
40 Correct 19 ms 5980 KB Output is correct
41 Correct 15 ms 6388 KB Output is correct
42 Correct 15 ms 6408 KB Output is correct
43 Correct 13 ms 6876 KB Output is correct
44 Correct 9 ms 6368 KB Output is correct
45 Correct 9 ms 6712 KB Output is correct
46 Correct 4 ms 5764 KB Output is correct
47 Correct 11 ms 5988 KB Output is correct
48 Correct 15 ms 6672 KB Output is correct
49 Correct 4 ms 6060 KB Output is correct
50 Correct 20 ms 6636 KB Output is correct
51 Correct 12 ms 6992 KB Output is correct
52 Correct 4 ms 6004 KB Output is correct
53 Correct 5 ms 6036 KB Output is correct
54 Correct 12 ms 6372 KB Output is correct
55 Correct 3 ms 6008 KB Output is correct
56 Correct 26 ms 6688 KB Output is correct
57 Correct 3 ms 6008 KB Output is correct
58 Correct 14 ms 6428 KB Output is correct
59 Correct 11 ms 6260 KB Output is correct
60 Correct 12 ms 6404 KB Output is correct
61 Correct 6 ms 6272 KB Output is correct
62 Correct 3 ms 6008 KB Output is correct
63 Correct 5 ms 6292 KB Output is correct
64 Correct 4 ms 6028 KB Output is correct
65 Correct 6 ms 6300 KB Output is correct
66 Correct 5 ms 6028 KB Output is correct
67 Correct 6 ms 5776 KB Output is correct
68 Correct 5 ms 6052 KB Output is correct
69 Correct 6 ms 6028 KB Output is correct
70 Correct 6 ms 6260 KB Output is correct
71 Partially correct 27 ms 6524 KB Partially correct - number of queries: 5032
72 Correct 7 ms 6084 KB Output is correct
73 Correct 25 ms 7184 KB Output is correct
74 Correct 22 ms 6792 KB Output is correct
75 Correct 6 ms 6036 KB Output is correct
76 Correct 24 ms 6288 KB Output is correct
77 Correct 26 ms 6768 KB Output is correct
78 Correct 6 ms 6264 KB Output is correct
79 Correct 12 ms 6516 KB Output is correct
80 Correct 21 ms 6008 KB Output is correct
81 Correct 26 ms 6764 KB Output is correct
82 Correct 31 ms 6672 KB Output is correct
83 Correct 5 ms 6008 KB Output is correct
84 Correct 28 ms 6300 KB Output is correct
85 Correct 19 ms 6852 KB Output is correct
86 Correct 18 ms 6592 KB Output is correct
87 Correct 5 ms 6004 KB Output is correct
88 Correct 6 ms 6720 KB Output is correct
89 Correct 12 ms 6804 KB Output is correct
90 Correct 4 ms 6008 KB Output is correct
91 Correct 5 ms 6516 KB Output is correct
92 Correct 7 ms 6520 KB Output is correct
93 Correct 8 ms 6520 KB Output is correct
94 Incorrect 36 ms 6652 KB Integer -1 violates the range [0, 199999]
95 Halted 0 ms 0 KB -