# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
804418 | rnl42 | Colors (BOI20_colors) | C++14 | 0 ms | 208 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
int N;
unordered_set<int> used;
bool query(int x) {
used.insert(x);
cout << "? " << x+1 << '\n' << flush;
bool ret;
cin >> ret;
return ret;
}
signed main() {
ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
cin >> N;
int mini = 1, maxi = N-1;
int cur = N/3;
query(cur);
while (mini != maxi) {
int mid = (mini+maxi)>>1;
int size_interv = maxi-mini+1;
int next;
if (cur+mid < N) {
next = cur+mid;
} else if (cur+mid >= 0) {
next = cur-mid;
} else {
int i;
for (i = N/3; i >= 0 && used.count(i); i--);
if (i != -1) {
query(i);
continue;
}
for (i = N/3+1; i < N && used.count(i); i++);
query(i);
continue;
}
if (query(next)) {
maxi = mid;
} else {
mini = mid+1;
}
cur = next;
}
cout << "= " << mini << '\n';
}
Compilation message (stderr)
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