# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
1096919 |
2024-10-05T12:47:01 Z |
gyg |
Colors (BOI20_colors) |
C++17 |
|
0 ms |
344 KB |
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define db long double
int n;
bool qry(int x) {
cout << "? " << x << endl;
bool ans; cin >> ans;
return ans;
}
bool chck(int st) {
int ps = st, drc = -1;
int lw = 1, hg = n;
while (lw != hg) {
int md = (lw + hg) / 2;
ps += drc * md;
if (ps < 1 || n < ps) return false;
lw = md + 1;
drc *= -1;
}
return true;
}
int gt_st() {
int st = roundl(n * (db) 2 / 3);
for (int i = st - 100; i <= st + 100; i++)
if (chck(i)) return i;
assert(false);
}
int bn_srch(int st) {
int ps = st; qry(ps);
int add = 0, drc = -1, lw = 1, hg = n;
while (lw != hg) {
// cout << lw << " " << hg << ": " << ps << endl;
int hlf = (hg - lw + 1) / 2;
ps += drc * (hlf + add);
if (qry(ps)) hg = lw + hlf - 1;
else {
add += hlf;
lw = lw + hlf;
}
drc *= -1;
}
return lw;
}
signed main() {
cin >> n;
int ans = bn_srch(gt_st());
cout << "= " << ans << endl;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (4 queries) |
2 |
Runtime error |
0 ms |
344 KB |
Execution killed with signal 13 |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (4 queries) |
2 |
Runtime error |
0 ms |
344 KB |
Execution killed with signal 13 |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (4 queries) |
2 |
Runtime error |
0 ms |
344 KB |
Execution killed with signal 13 |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (4 queries) |
2 |
Runtime error |
0 ms |
344 KB |
Execution killed with signal 13 |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (4 queries) |
2 |
Runtime error |
0 ms |
344 KB |
Execution killed with signal 13 |
3 |
Halted |
0 ms |
0 KB |
- |