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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#740932 | #6303. Inversion | OIer_kzc# | WA | 61ms | 7872kb | C++17 | 1.2kb | 2024-11-13 12:30:13 | 2024-11-13 12:30:19 |
Judging History
answer
#include <stdio.h>
#include <string.h>
#include <random>
#include <chrono>
#include <algorithm>
#define LOG(FMT...) fprintf(stderr, FMT)
using namespace std;
typedef long long LL;
constexpr int N = 2005;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
int n;
int a[N], b[N];
int cur;
bool f[N][N];
bool Q(int x) {
int s, t;
printf("? %d %d\n", x, cur);
fflush(stdout);
scanf("%d", &s);
if (x == cur - 1) {
return s;
}
printf("? %d %d\n", x + 1, cur);
fflush(stdout);
scanf("%d", &t);
s ^= t;
return s ^ f[x][cur - 1] ^ f[x + 1][cur - 1];
}
int main() {
scanf("%d", &n);
b[1] = 1;
for (cur = 2; cur <= n; ++cur) {
int l = 1, r = cur, md;
while (l < r) {
int md = l + r >> 1;
if (Q(b[md])) {
r = md;
} else {
l = md + 1;
}
}
for (int j = cur; j > r; --j) {
b[j] = b[j - 1];
}
b[r] = cur;
for (int i = 1; i <= cur; ++i) {
a[b[i]] = i;
}
f[cur - 1][cur] = (a[cur - 1] > cur);
for (int x = cur - 2; x; --x) {
f[x][cur] = (a[x] > a[cur]) ^ f[x + 1][cur] ^ f[x][cur - 1] ^ f[x + 1][cur - 1];
}
}
printf("!");
for (int i = 1; i <= n; ++i) {
printf(" %d", a[i]);
}
puts("");
fflush(stdout);
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3948kb
input:
3 0 1 0 1
output:
? 1 2 ? 2 3 ? 1 3 ? 2 3 ! 2 3 1
result:
ok OK, guesses=4
Test #2:
score: -100
Wrong Answer
time: 61ms
memory: 7872kb
input:
1993 0 0 0 0 0 0 1 1 0 0 1 0 0 0 0 0 1 0 1 0 1 0 1 0 0 1 0 1 1 0 1 1 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 1 0 1 1 0 1 0 1 1 1 1 1 1 0 1 0 1 1 0 1 1 0 1 0 0 0 0 0 1 0 0 1 0 1 0 0 1 1 0 1 1 0 0 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 1 0 1 1 1 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 1 1 0 0...
output:
? 1 2 ? 2 3 ? 2 4 ? 3 4 ? 3 4 ? 3 5 ? 4 5 ? 2 5 ? 3 5 ? 1 5 ? 2 5 ? 2 6 ? 3 6 ? 1 6 ? 2 6 ? 5 6 ? 2 7 ? 3 7 ? 6 7 ? 5 7 ? 6 7 ? 1 8 ? 2 8 ? 3 8 ? 4 8 ? 2 8 ? 3 8 ? 2 9 ? 3 9 ? 6 9 ? 7 9 ? 5 9 ? 6 9 ? 1 10 ? 2 10 ? 3 10 ? 4 10 ? 8 10 ? 9 10 ? 2 11 ? 3 11 ? 3 11 ? 4 11 ? 10 11 ? 2 12 ? 3 12 ? 11 12 ? ...
result:
wrong answer Wa.