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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#477773 | #6303. Inversion | pavement | TL | 4ms | 19396kb | C++17 | 1.2kb | 2024-07-14 10:26:11 | 2024-07-14 10:26:12 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
int n, a[2005], chc[2005][2005];
int qry(int l, int r) {
if (l >= r) {
return 0;
}
if (a[r]) {
bool ret = 0;
for (int x = l; x <= r; x++) {
for (int y = x + 1; y <= r; y++) {
if (a[x] > a[y]) {
ret ^= 1;
}
}
}
return ret;
}
if (chc[l][r] != -1) {
return chc[l][r];
}
bool ret;
cout << "? " << l << ' ' << r << endl;
cin >> ret;
return chc[l][r] = ret;
}
int main() {
memset(chc, -1, sizeof chc);
a[1] = 1;
cin >> n;
for (int i = 2; i <= n; i++) {
int lo = 1, hi = i - 1, val = i;
while (lo <= hi) {
int mid = (lo + hi) / 2, pos = -1;
for (int j = 1; j < i; j++) {
if (a[j] == mid) {
pos = j;
break;
}
}
assert(pos != -1);
// [pos, i]
int x = qry(pos + 1, i);
int y = qry(pos, i);
bool cur = y ^ x ^ qry(pos, i - 1) ^ qry(pos + 1, i - 1);
if (cur) {
// mid > a[i]
val = mid;
hi = mid - 1;
} else {
lo = mid + 1;
}
}
for (int j = 1; j < i; j++) {
if (a[j] >= val) {
a[j]++;
}
}
a[i] = val;
}
cout << "! ";
for (int i = 1; i <= n; i++) {
cout << a[i] << ' ';
}
cout << endl;
}
Details
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Test #1:
score: 100
Accepted
time: 4ms
memory: 19396kb
input:
3 0 1 0
output:
? 1 2 ? 2 3 ? 1 3 ! 2 3 1
result:
ok OK, guesses=3
Test #2:
score: -100
Time Limit Exceeded
input:
1993 0 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 1 0 0 0 1 0 1 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 1 1 0 1 1 1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 1 0 1 1 0 0 1 0 1 1 1 0 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 0 1 0 1 1 0 1 0 0 1 1 1 1 0 0 1 1 0 0 0 1 0 0 1 1 1 0 0 1 0 1 0 0 1 0 0 1 1 0 0 0 1 1 1 1 1 1 0 0 0...
output:
? 1 2 ? 2 3 ? 1 3 ? 3 4 ? 2 4 ? 3 5 ? 2 5 ? 1 5 ? 3 6 ? 2 6 ? 5 6 ? 1 6 ? 2 7 ? 1 7 ? 6 7 ? 5 7 ? 2 8 ? 1 8 ? 4 8 ? 3 8 ? 2 9 ? 1 9 ? 8 9 ? 3 9 ? 9 10 ? 6 10 ? 5 10 ? 8 10 ? 7 10 ? 2 11 ? 1 11 ? 9 11 ? 8 11 ? 10 11 ? 11 12 ? 9 12 ? 8 12 ? 10 12 ? 3 12 ? 2 12 ? 12 13 ? 11 13 ? 4 13 ? 3 13 ? 5 13 ? 10...