oj.uz

Submission #1041297

# Submission time Handle Problem Language Result Execution time Memory
1041297 2024-08-01T20:21:44 Z PCTprobability The Big Prize (IOI17_prize) C++17
100 / 100
 21 ms 600 KB 
#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
int ans=-1;
int m;
int N;
int cnt=0;
vector<int> query(int id){
  if(id==N) return {m,0};
  else{
    vector<int> a=ask(id);
    if(a[0]+a[1]==0) ans=id;
    return a;
  }
}
void solve(int l,int r,int x,int p,int q){
  if(x==0) return;
  if(r-l+1==x){
    for(int i=l;i<=r;i++){
      vector<int> a=query(i);
      if(a[0]+a[1]==0){
        ans=i;
        return;
      }
    }
    return;
  }
  if(ans!=-1) return;
  int mid=(l+r)/2;
  //mid+1 を聞く
  vector<int> a=query(mid+1);
  if(a[0]+a[1]==m){
    solve(l,mid,a[0]-p,p,a[1]);
    if(ans!=-1) return;
    solve(mid+1,r,a[1]-q,a[0],q);
  }
  else{
    int now=mid+1;
    int cnt=1;
    while(now<r){
      vector<int> a=query(now+1);
      if(a[0]+a[1]!=m){
        cnt++;
        now++;
      }
      else{
        break;
      }
    }
    if(now==r){
      //mid+1 から r は全部特殊
      solve(l,mid,x-cnt,p,q+cnt);
    }
    else{
      vector<int> a=query(now+1);
      //mid+1 から now は全部特殊
      solve(now+1,r,a[1]-q,a[0],q);
      if(ans!=-1) return;
      solve(l,mid,a[0]-cnt-p,p,a[1]+cnt);
      if(ans!=-1) return;
    }
  }
}
int find_best(int n) {
  N=n;
  if(n<=5000){
    for(int i=0;i<n;i++){
      vector<int> a=ask(i);
      if(a[0]+a[1]==0) return i;
    }
  }
  m=-1;
  int f=0;
  for(int i=0;i<480;i++){
    int k=i%n;
    vector<int> a=query(k);
    if(a[0]+a[1]==0) return i;
    if(m<a[0]+a[1]) m=a[0]+a[1];
    if(m>=40){
      f=i;
      break;
    }
  }
  solve(0,n-1,m,0,0);
  return ans;
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:73:7: warning: variable 'f' set but not used [-Wunused-but-set-variable]
   73 |   int f=0;
      |       ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 3 ms 344 KB Output is correct
3 Correct 3 ms 344 KB Output is correct
4 Correct 2 ms 344 KB Output is correct
5 Correct 2 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 2 ms 424 KB Output is correct
8 Correct 2 ms 344 KB Output is correct
9 Correct 2 ms 344 KB Output is correct
10 Correct 2 ms 344 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 344 KB Output is correct
2 Correct 3 ms 344 KB Output is correct
3 Correct 2 ms 424 KB Output is correct
4 Correct 2 ms 344 KB Output is correct
5 Correct 3 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 3 ms 428 KB Output is correct
8 Correct 3 ms 344 KB Output is correct
9 Correct 2 ms 344 KB Output is correct
10 Correct 2 ms 344 KB Output is correct
11 Correct 4 ms 344 KB Output is correct
12 Correct 2 ms 428 KB Output is correct
13 Correct 4 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 3 ms 432 KB Output is correct
16 Correct 15 ms 344 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 15 ms 344 KB Output is correct
19 Correct 0 ms 344 KB Output is correct
20 Correct 3 ms 344 KB Output is correct
21 Correct 6 ms 344 KB Output is correct
22 Correct 2 ms 344 KB Output is correct
23 Correct 2 ms 344 KB Output is correct
24 Correct 2 ms 344 KB Output is correct
25 Correct 6 ms 344 KB Output is correct
26 Correct 10 ms 344 KB Output is correct
27 Correct 3 ms 344 KB Output is correct
28 Correct 15 ms 432 KB Output is correct
29 Correct 12 ms 344 KB Output is correct
30 Correct 20 ms 344 KB Output is correct
31 Correct 1 ms 344 KB Output is correct
32 Correct 2 ms 344 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 8 ms 344 KB Output is correct
35 Correct 2 ms 344 KB Output is correct
36 Correct 4 ms 344 KB Output is correct
37 Correct 2 ms 344 KB Output is correct
38 Correct 2 ms 344 KB Output is correct
39 Correct 9 ms 344 KB Output is correct
40 Correct 13 ms 344 KB Output is correct
41 Correct 10 ms 344 KB Output is correct
42 Correct 6 ms 344 KB Output is correct
43 Correct 8 ms 344 KB Output is correct
44 Correct 5 ms 344 KB Output is correct
45 Correct 7 ms 344 KB Output is correct
46 Correct 0 ms 344 KB Output is correct
47 Correct 7 ms 424 KB Output is correct
48 Correct 19 ms 344 KB Output is correct
49 Correct 1 ms 344 KB Output is correct
50 Correct 17 ms 344 KB Output is correct
51 Correct 4 ms 344 KB Output is correct
52 Correct 1 ms 344 KB Output is correct
53 Correct 3 ms 344 KB Output is correct
54 Correct 7 ms 344 KB Output is correct
55 Correct 1 ms 344 KB Output is correct
56 Correct 20 ms 424 KB Output is correct
57 Correct 10 ms 344 KB Output is correct
58 Correct 11 ms 344 KB Output is correct
59 Correct 10 ms 344 KB Output is correct
60 Correct 9 ms 428 KB Output is correct
61 Correct 3 ms 344 KB Output is correct
62 Correct 2 ms 428 KB Output is correct
63 Correct 3 ms 344 KB Output is correct
64 Correct 2 ms 344 KB Output is correct
65 Correct 1 ms 344 KB Output is correct
66 Correct 2 ms 344 KB Output is correct
67 Correct 3 ms 344 KB Output is correct
68 Correct 2 ms 344 KB Output is correct
69 Correct 3 ms 432 KB Output is correct
70 Correct 2 ms 344 KB Output is correct
71 Correct 16 ms 344 KB Output is correct
72 Correct 3 ms 344 KB Output is correct
73 Correct 17 ms 344 KB Output is correct
74 Correct 20 ms 344 KB Output is correct
75 Correct 3 ms 344 KB Output is correct
76 Correct 19 ms 344 KB Output is correct
77 Correct 16 ms 344 KB Output is correct
78 Correct 4 ms 340 KB Output is correct
79 Correct 10 ms 344 KB Output is correct
80 Correct 16 ms 344 KB Output is correct
81 Correct 13 ms 344 KB Output is correct
82 Correct 14 ms 344 KB Output is correct
83 Correct 3 ms 344 KB Output is correct
84 Correct 11 ms 344 KB Output is correct
85 Correct 21 ms 344 KB Output is correct
86 Correct 6 ms 344 KB Output is correct
87 Correct 2 ms 344 KB Output is correct
88 Correct 4 ms 344 KB Output is correct
89 Correct 4 ms 344 KB Output is correct
90 Correct 2 ms 356 KB Output is correct
91 Correct 3 ms 600 KB Output is correct
92 Correct 3 ms 344 KB Output is correct
93 Correct 4 ms 344 KB Output is correct
94 Correct 5 ms 344 KB Output is correct
95 Correct 5 ms 344 KB Output is correct
96 Correct 5 ms 344 KB Output is correct
97 Correct 4 ms 344 KB Output is correct