#include "prize.h"
#include <iostream>
using namespace std;
int sub1(int st, int ed) {
int mid = (st + ed) / 2;
vector<int> v = ask(mid);
int l = v[0], r = v[1];
if(l == 1) return sub1(st, mid-1);
else if(r == 1) return sub1(mid+1, ed);
else return mid;
}
int ls[200100], rs[200100], maxLR;
// u = sum of cheapest V's left and right
bool isDiamond(int i);
void makeLR(int i);
int findDiamond(int st, int ed);
int sub2(int n) { // idx: 0 ~ n-1
for(int i=0; i<n; i++) {
ls[i] = -1; rs[i] = -1;
}
makeLR(0);
if(isDiamond(0)) return 0;
makeLR(n-1);
if(isDiamond(n-1)) return n-1;
return findDiamond(0, n-1);
}
bool isDiamond(int i) {
return ls[i] + rs[i] == 0;
}
void makeLR(int i) {
if(ls[i] != -1 && rs[i] != -1) return;
vector<int> v = ask(i);
ls[i] = v[0]; rs[i] = v[1];
}
int findDiamond(int st, int ed) {
if(ed - st <= 1) return -1;
// else
if(ls[st] + rs[st] == ls[ed] + rs[ed]) {
// if st~ed, no prize
if(ls[ed] - ls[st] == 0) return -1;
// else
int mid = (st + ed) / 2;
makeLR(mid);
if(isDiamond(mid)) return mid;
int resL = findDiamond(st, mid); // check initial condition
int resR = findDiamond(mid, ed);
return resL > resR ? resL:resR;
}
else if(ls[st] + rs[st] < ls[ed] + rs[ed]) {
makeLR(st+1);
if(isDiamond(st+1)) return st+1;
else return findDiamond(st+1, ed);
}
else {
makeLR(ed-1);
if(isDiamond(ed-1)) return ed-1;
else return findDiamond(st, ed-1);
}
}
int find_best(int n) {
return sub2(n);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 3 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 5 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 6 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 7 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 8 |
Correct |
2 ms |
2044 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 10 |
Correct |
1 ms |
1880 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 3 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 5 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 7 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 8 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 10 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1880 KB |
Output is correct |
| 12 |
Correct |
3 ms |
1976 KB |
Output is correct |
| 13 |
Correct |
3 ms |
1880 KB |
Output is correct |
| 14 |
Correct |
5 ms |
796 KB |
Output is correct |
| 15 |
Correct |
22 ms |
1880 KB |
Output is correct |
| 16 |
Correct |
18 ms |
1880 KB |
Output is correct |
| 17 |
Correct |
22 ms |
2136 KB |
Output is correct |
| 18 |
Correct |
20 ms |
1880 KB |
Output is correct |
| 19 |
Correct |
20 ms |
1880 KB |
Output is correct |
| 20 |
Correct |
12 ms |
1112 KB |
Output is correct |
| 21 |
Correct |
25 ms |
2136 KB |
Output is correct |
| 22 |
Correct |
15 ms |
1880 KB |
Output is correct |
| 23 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 24 |
Correct |
3 ms |
1880 KB |
Output is correct |
| 25 |
Correct |
20 ms |
1880 KB |
Output is correct |
| 26 |
Correct |
21 ms |
1876 KB |
Output is correct |
| 27 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 28 |
Correct |
17 ms |
1880 KB |
Output is correct |
| 29 |
Correct |
17 ms |
1880 KB |
Output is correct |
| 30 |
Correct |
22 ms |
1880 KB |
Output is correct |
| 31 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 32 |
Correct |
4 ms |
1880 KB |
Output is correct |
| 33 |
Correct |
1 ms |
344 KB |
Output is correct |
| 34 |
Correct |
24 ms |
1968 KB |
Output is correct |
| 35 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 36 |
Correct |
22 ms |
1876 KB |
Output is correct |
| 37 |
Correct |
4 ms |
1876 KB |
Output is correct |
| 38 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 39 |
Correct |
19 ms |
1880 KB |
Output is correct |
| 40 |
Correct |
18 ms |
1880 KB |
Output is correct |
| 41 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 42 |
Correct |
26 ms |
1880 KB |
Output is correct |
| 43 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 44 |
Correct |
17 ms |
1880 KB |
Output is correct |
| 45 |
Correct |
20 ms |
1880 KB |
Output is correct |
| 46 |
Correct |
18 ms |
1880 KB |
Output is correct |
| 47 |
Correct |
19 ms |
1880 KB |
Output is correct |
| 48 |
Correct |
24 ms |
1880 KB |
Output is correct |
| 49 |
Correct |
24 ms |
2136 KB |
Output is correct |
| 50 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 51 |
Correct |
23 ms |
1880 KB |
Output is correct |
| 52 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 53 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 54 |
Correct |
18 ms |
2132 KB |
Output is correct |
| 55 |
Correct |
18 ms |
1880 KB |
Output is correct |
| 56 |
Correct |
22 ms |
1880 KB |
Output is correct |
| 57 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 58 |
Correct |
23 ms |
1880 KB |
Output is correct |
| 59 |
Correct |
30 ms |
1880 KB |
Output is correct |
| 60 |
Correct |
20 ms |
1880 KB |
Output is correct |
| 61 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 62 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 63 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 64 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 65 |
Correct |
2 ms |
1876 KB |
Output is correct |
| 66 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 67 |
Correct |
3 ms |
1880 KB |
Output is correct |
| 68 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 69 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 70 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 71 |
Correct |
19 ms |
1880 KB |
Output is correct |
| 72 |
Correct |
3 ms |
1880 KB |
Output is correct |
| 73 |
Correct |
19 ms |
1880 KB |
Output is correct |
| 74 |
Correct |
18 ms |
1880 KB |
Output is correct |
| 75 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 76 |
Correct |
18 ms |
1880 KB |
Output is correct |
| 77 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 78 |
Correct |
3 ms |
1880 KB |
Output is correct |
| 79 |
Correct |
13 ms |
1880 KB |
Output is correct |
| 80 |
Correct |
21 ms |
1880 KB |
Output is correct |
| 81 |
Correct |
19 ms |
1880 KB |
Output is correct |
| 82 |
Correct |
32 ms |
1880 KB |
Output is correct |
| 83 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 84 |
Correct |
16 ms |
1880 KB |
Output is correct |
| 85 |
Correct |
22 ms |
1880 KB |
Output is correct |
| 86 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 87 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 88 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 89 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 90 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 91 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 92 |
Correct |
1 ms |
1880 KB |
Output is correct |
| 93 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 94 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 95 |
Correct |
2 ms |
1880 KB |
Output is correct |
| 96 |
Correct |
3 ms |
1880 KB |
Output is correct |
| 97 |
Correct |
1 ms |
1880 KB |
Output is correct |
