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Submission #966356

# Submission time Handle Problem Language Result Execution time Memory
966356 2024-04-19T18:04:12 Z bachhoangxuan The Big Prize (IOI17_prize) C++17
99.63 / 100
 36 ms 7656 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;rng.seed(998244353);
    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<480;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 5 ms 6264 KB Output is correct
2 Correct 5 ms 6268 KB Output is correct
3 Correct 8 ms 5756 KB Output is correct
4 Correct 7 ms 5772 KB Output is correct
5 Correct 6 ms 6020 KB Output is correct
6 Correct 2 ms 5740 KB Output is correct
7 Correct 5 ms 6024 KB Output is correct
8 Correct 5 ms 6016 KB Output is correct
9 Correct 6 ms 6012 KB Output is correct
10 Correct 7 ms 6536 KB Output is correct

Subtask #2
79.63 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6264 KB Output is correct
2 Correct 7 ms 6008 KB Output is correct
3 Correct 4 ms 6020 KB Output is correct
4 Correct 6 ms 6008 KB Output is correct
5 Correct 6 ms 6012 KB Output is correct
6 Correct 2 ms 5720 KB Output is correct
7 Correct 5 ms 6008 KB Output is correct
8 Correct 5 ms 6240 KB Output is correct
9 Correct 5 ms 6004 KB Output is correct
10 Correct 6 ms 5752 KB Output is correct
11 Correct 5 ms 6080 KB Output is correct
12 Correct 3 ms 6008 KB Output is correct
13 Correct 9 ms 6004 KB Output is correct
14 Correct 4 ms 6268 KB Output is correct
15 Correct 6 ms 6308 KB Output is correct
16 Correct 21 ms 6748 KB Output is correct
17 Correct 3 ms 6012 KB Output is correct
18 Correct 26 ms 6856 KB Output is correct
19 Correct 4 ms 6008 KB Output is correct
20 Correct 7 ms 6604 KB Output is correct
21 Correct 12 ms 6740 KB Output is correct
22 Correct 5 ms 6048 KB Output is correct
23 Correct 5 ms 6008 KB Output is correct
24 Correct 4 ms 6008 KB Output is correct
25 Correct 12 ms 6252 KB Output is correct
26 Correct 14 ms 6664 KB Output is correct
27 Correct 4 ms 5772 KB Output is correct
28 Correct 29 ms 6228 KB Output is correct
29 Correct 16 ms 6488 KB Output is correct
30 Correct 29 ms 6276 KB Output is correct
31 Correct 4 ms 6012 KB Output is correct
32 Correct 8 ms 6012 KB Output is correct
33 Correct 2 ms 5720 KB Output is correct
34 Correct 9 ms 6832 KB Output is correct
35 Correct 5 ms 6024 KB Output is correct
36 Correct 7 ms 6560 KB Output is correct
37 Correct 5 ms 6016 KB Output is correct
38 Correct 4 ms 6016 KB Output is correct
39 Correct 11 ms 6372 KB Output is correct
40 Correct 22 ms 6884 KB Output is correct
41 Correct 16 ms 6672 KB Output is correct
42 Correct 14 ms 6476 KB Output is correct
43 Correct 11 ms 6132 KB Output is correct
44 Correct 12 ms 6956 KB Output is correct
45 Correct 10 ms 6300 KB Output is correct
46 Correct 4 ms 6012 KB Output is correct
47 Correct 10 ms 6916 KB Output is correct
48 Correct 21 ms 6004 KB Output is correct
49 Correct 5 ms 6292 KB Output is correct
50 Correct 22 ms 6652 KB Output is correct
51 Correct 13 ms 6208 KB Output is correct
52 Correct 4 ms 6260 KB Output is correct
53 Correct 7 ms 6268 KB Output is correct
54 Correct 13 ms 6904 KB Output is correct
55 Correct 4 ms 5760 KB Output is correct
56 Correct 22 ms 7656 KB Output is correct
57 Correct 15 ms 6304 KB Output is correct
58 Correct 19 ms 6504 KB Output is correct
59 Correct 14 ms 6672 KB Output is correct
60 Correct 11 ms 6492 KB Output is correct
61 Correct 5 ms 6028 KB Output is correct
62 Correct 4 ms 5756 KB Output is correct
63 Correct 7 ms 6008 KB Output is correct
64 Correct 5 ms 6004 KB Output is correct
65 Correct 7 ms 5956 KB Output is correct
66 Correct 7 ms 6008 KB Output is correct
67 Correct 7 ms 6024 KB Output is correct
68 Correct 4 ms 6012 KB Output is correct
69 Correct 6 ms 6024 KB Output is correct
70 Correct 6 ms 6292 KB Output is correct
71 Partially correct 23 ms 6716 KB Partially correct - number of queries: 5037
72 Correct 8 ms 6012 KB Output is correct
73 Correct 36 ms 6304 KB Output is correct
74 Partially correct 35 ms 6536 KB Partially correct - number of queries: 5005
75 Correct 6 ms 5780 KB Output is correct
76 Correct 22 ms 7012 KB Output is correct
77 Correct 25 ms 6752 KB Output is correct
78 Correct 7 ms 6264 KB Output is correct
79 Correct 14 ms 6676 KB Output is correct
80 Correct 25 ms 6676 KB Output is correct
81 Correct 33 ms 6408 KB Output is correct
82 Correct 28 ms 6772 KB Output is correct
83 Correct 5 ms 6008 KB Output is correct
84 Correct 21 ms 7104 KB Output is correct
85 Correct 23 ms 6724 KB Output is correct
86 Correct 6 ms 6260 KB Output is correct
87 Correct 7 ms 6044 KB Output is correct
88 Correct 7 ms 6520 KB Output is correct
89 Correct 6 ms 5752 KB Output is correct
90 Correct 7 ms 6012 KB Output is correct
91 Correct 8 ms 6264 KB Output is correct
92 Correct 7 ms 6276 KB Output is correct
93 Correct 6 ms 6524 KB Output is correct
94 Correct 7 ms 6056 KB Output is correct
95 Correct 8 ms 6584 KB Output is correct
96 Correct 7 ms 6540 KB Output is correct
97 Correct 5 ms 6044 KB Output is correct