#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
int m,ball=0,a[200005][2],ans=-1;
int find(int x)
{
if(a[x][0]==-1)
{
std::vector<int> res = ask(x);
a[x][0]=res[0];
a[x][1]=res[1];
}
return 0;
}
int solve(int s,int e){
//cout<<s<<" "<<e<<endl;
if(s>=e-1)return 0;
if(ans!=-1)return 0;
int ne,ns;
if((s+e)%2==0)ne=(s+e)/2,ns=(s+e)/2;
else ne=(s+e)/2+1,ns=(s+e)/2+1;
while(ns<e)
{
find(ns);
if(a[ns][0]+a[ns][1]==0)
{
ans=ns;
return 0;
}
if(a[ns][0]+a[ns][1]!=ball)ns++;
else break;
}
while(s<ne)
{
find(ne);
if(a[ne][0]+a[ne][1]==0)
{
ans=ne;
break;
}
if(a[ne][0]+a[ne][1]!=ball)ne--;
else break;
}
//cout<<ne<<" "<<ns<<endl;
if(a[s][0]!=a[ne][0] )solve(s,ne);
if(a[ns][0]!=a[e][0] )solve(ns,e);
}
int find_best(int n) {
for(int i=0;i<n;i++)
{
a[i][0]=-1;
a[i][1]=-1;
}
for(int t = 0; t < 473; t++) {
long long int i=rand();
i%=n;
find(i);
//cout<<a[i][0]<<" "<<a[i][1]<<endl;
if(a[i][0]+a[i][1]==0)
{
ans=i;
break;
}
if(a[i][0] + a[i][1] > ball)
{
m=i;
ball=a[i][0]+a[i][1];
}
}
if(ans!=-1)return ans;
// cout<<m<<endl;
int start=0,end=n-1;
while(true)
{
find(start);
if(a[start][0]+a[start][1]==0)ans=start;
if(a[start][0]+a[start][1]!=ball)start++;
else break;
}
while(true)
{
find(end);
if(a[end][0]+a[end][1]==0)ans=end;
if(a[end][0]+a[end][1]!=ball)end--;
else break;
}
if(ans!=-1)return ans;
//cout<<start<<" "<<end<<endl;
solve(start,m);
solve(m,end);
return ans;
}
Compilation message
prize.cpp: In function 'int solve(int, int)':
prize.cpp:47:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
1920 KB |
Output is correct |
| 2 |
Correct |
9 ms |
1784 KB |
Output is correct |
| 3 |
Correct |
5 ms |
1848 KB |
Output is correct |
| 4 |
Correct |
4 ms |
1920 KB |
Output is correct |
| 5 |
Correct |
8 ms |
1804 KB |
Output is correct |
| 6 |
Correct |
7 ms |
1848 KB |
Output is correct |
| 7 |
Correct |
8 ms |
1920 KB |
Output is correct |
| 8 |
Correct |
7 ms |
1920 KB |
Output is correct |
| 9 |
Correct |
10 ms |
1840 KB |
Output is correct |
| 10 |
Correct |
9 ms |
1920 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
9 ms |
1920 KB |
Output is correct |
| 2 |
Correct |
7 ms |
1852 KB |
Output is correct |
| 3 |
Correct |
5 ms |
1960 KB |
Output is correct |
| 4 |
Correct |
7 ms |
1920 KB |
Output is correct |
| 5 |
Correct |
6 ms |
1792 KB |
Output is correct |
| 6 |
Correct |
5 ms |
1912 KB |
Output is correct |
| 7 |
Correct |
7 ms |
1912 KB |
Output is correct |
| 8 |
Correct |
5 ms |
1852 KB |
Output is correct |
| 9 |
Correct |
9 ms |
1844 KB |
Output is correct |
| 10 |
Correct |
25 ms |
1792 KB |
Output is correct |
| 11 |
Correct |
9 ms |
1912 KB |
Output is correct |
| 12 |
Correct |
10 ms |
1792 KB |
Output is correct |
| 13 |
Correct |
13 ms |
1828 KB |
Output is correct |
| 14 |
Correct |
7 ms |
512 KB |
Output is correct |
| 15 |
Correct |
6 ms |
1912 KB |
Output is correct |
| 16 |
Correct |
5 ms |
1912 KB |
Output is correct |
| 17 |
Correct |
5 ms |
2044 KB |
Output is correct |
| 18 |
Partially correct |
30 ms |
1920 KB |
Partially correct - number of queries: 5063 |
| 19 |
Correct |
4 ms |
1860 KB |
Output is correct |
| 20 |
Correct |
9 ms |
1024 KB |
Output is correct |
| 21 |
Correct |
20 ms |
1832 KB |
Output is correct |
| 22 |
Correct |
6 ms |
1848 KB |
Output is correct |
| 23 |
Correct |
9 ms |
1792 KB |
Output is correct |
| 24 |
Correct |
8 ms |
1784 KB |
Output is correct |
| 25 |
Correct |
12 ms |
1912 KB |
Output is correct |
| 26 |
Correct |
31 ms |
1784 KB |
Output is correct |
| 27 |
Correct |
5 ms |
1848 KB |
Output is correct |
| 28 |
Correct |
38 ms |
1912 KB |
Output is correct |
| 29 |
Correct |
19 ms |
1912 KB |
Output is correct |
| 30 |
Partially correct |
19 ms |
1912 KB |
Partially correct - number of queries: 5043 |
| 31 |
Correct |
4 ms |
1940 KB |
Output is correct |
| 32 |
Correct |
6 ms |
1912 KB |
Output is correct |
| 33 |
Correct |
3 ms |
256 KB |
Output is correct |
| 34 |
Correct |
12 ms |
1920 KB |
Output is correct |
| 35 |
Correct |
5 ms |
1912 KB |
Output is correct |
| 36 |
Correct |
9 ms |
1788 KB |
Output is correct |
| 37 |
Correct |
6 ms |
1784 KB |
Output is correct |
| 38 |
Correct |
9 ms |
1912 KB |
Output is correct |
| 39 |
Correct |
13 ms |
1936 KB |
Output is correct |
| 40 |
Correct |
33 ms |
1920 KB |
Output is correct |
| 41 |
Correct |
13 ms |
1844 KB |
Output is correct |
| 42 |
Correct |
13 ms |
2040 KB |
Output is correct |
| 43 |
Correct |
29 ms |
1844 KB |
Output is correct |
| 44 |
Correct |
17 ms |
1792 KB |
Output is correct |
| 45 |
Correct |
16 ms |
1964 KB |
Output is correct |
| 46 |
Correct |
8 ms |
1784 KB |
Output is correct |
| 47 |
Correct |
11 ms |
1792 KB |
Output is correct |
| 48 |
Correct |
16 ms |
1844 KB |
Output is correct |
| 49 |
Correct |
8 ms |
1792 KB |
Output is correct |
| 50 |
Partially correct |
19 ms |
1912 KB |
Partially correct - number of queries: 5091 |
| 51 |
Correct |
38 ms |
1832 KB |
Output is correct |
| 52 |
Correct |
9 ms |
1784 KB |
Output is correct |
| 53 |
Correct |
10 ms |
1784 KB |
Output is correct |
| 54 |
Correct |
51 ms |
1848 KB |
Output is correct |
| 55 |
Correct |
8 ms |
1944 KB |
Output is correct |
| 56 |
Partially correct |
41 ms |
1784 KB |
Partially correct - number of queries: 5086 |
| 57 |
Correct |
32 ms |
1912 KB |
Output is correct |
| 58 |
Correct |
26 ms |
1784 KB |
Output is correct |
| 59 |
Correct |
33 ms |
1832 KB |
Output is correct |
| 60 |
Correct |
16 ms |
2040 KB |
Output is correct |
| 61 |
Correct |
9 ms |
1784 KB |
Output is correct |
| 62 |
Correct |
5 ms |
1856 KB |
Output is correct |
| 63 |
Correct |
5 ms |
1920 KB |
Output is correct |
| 64 |
Correct |
5 ms |
1912 KB |
Output is correct |
| 65 |
Correct |
7 ms |
1784 KB |
Output is correct |
| 66 |
Correct |
7 ms |
1920 KB |
Output is correct |
| 67 |
Correct |
10 ms |
1784 KB |
Output is correct |
| 68 |
Correct |
13 ms |
1792 KB |
Output is correct |
| 69 |
Correct |
6 ms |
1912 KB |
Output is correct |
| 70 |
Correct |
9 ms |
1784 KB |
Output is correct |
| 71 |
Partially correct |
21 ms |
1920 KB |
Partially correct - number of queries: 5200 |
| 72 |
Correct |
13 ms |
1792 KB |
Output is correct |
| 73 |
Partially correct |
38 ms |
1920 KB |
Partially correct - number of queries: 5141 |
| 74 |
Partially correct |
21 ms |
1792 KB |
Partially correct - number of queries: 5167 |
| 75 |
Correct |
10 ms |
1920 KB |
Output is correct |
| 76 |
Correct |
40 ms |
1920 KB |
Output is correct |
| 77 |
Partially correct |
44 ms |
1948 KB |
Partially correct - number of queries: 5081 |
| 78 |
Correct |
6 ms |
1936 KB |
Output is correct |
| 79 |
Correct |
24 ms |
1792 KB |
Output is correct |
| 80 |
Partially correct |
20 ms |
1920 KB |
Partially correct - number of queries: 5115 |
| 81 |
Partially correct |
20 ms |
1920 KB |
Partially correct - number of queries: 5075 |
| 82 |
Partially correct |
22 ms |
1920 KB |
Partially correct - number of queries: 5085 |
| 83 |
Correct |
10 ms |
1792 KB |
Output is correct |
| 84 |
Correct |
51 ms |
1920 KB |
Output is correct |
| 85 |
Partially correct |
50 ms |
1792 KB |
Partially correct - number of queries: 5140 |
| 86 |
Correct |
21 ms |
1920 KB |
Output is correct |
| 87 |
Correct |
10 ms |
1792 KB |
Output is correct |
| 88 |
Correct |
39 ms |
1792 KB |
Output is correct |
| 89 |
Correct |
10 ms |
1792 KB |
Output is correct |
| 90 |
Correct |
6 ms |
1792 KB |
Output is correct |
| 91 |
Correct |
10 ms |
1940 KB |
Output is correct |
| 92 |
Correct |
26 ms |
1920 KB |
Output is correct |
| 93 |
Correct |
42 ms |
1792 KB |
Output is correct |
| 94 |
Correct |
42 ms |
1948 KB |
Output is correct |
| 95 |
Correct |
26 ms |
1792 KB |
Output is correct |
| 96 |
Correct |
28 ms |
1792 KB |
Output is correct |
| 97 |
Correct |
18 ms |
1920 KB |
Output is correct |
