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ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#303724 | #6303. Inversion | hammer | WA | 1ms | 3796kb | C++17 | 2.1kb | 2024-01-12 22:16:47 | 2024-01-12 22:16:48 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
constexpr int mod = 1e9 + 7;
const int N = 2e3 + 10;
int asked[N][N];
int res[N][N];
int id2rank[N];
int rank2id[N];
int now;
int qcnt;
int query(int l, int r)
{
// printf("q %d %d\n",l,r);
if (l >= r)
return 0;
if (asked[l][r])
return res[l][r];
int ans = 0;
if (r <= now) {
for (int i = l; i < r; i++) {
for (int j = i + 1; j <= r; j++) {
if (id2rank[i] > id2rank[j]) {
ans ^= 1;
}
}
}
} else {
qcnt++;
assert(qcnt<=40000);
printf("? %d %d\n", l, r);
fflush(stdout);
scanf("%d", &ans);
}
asked[l][r] = 1;
res[l][r] = ans;
return ans;
}
int cmp(int l, int r)
{
int af = query(l, r);
int sf = query(l + 1, r);
int ad = query(l, r - 1);
int sd = query(l + 1, r - 1);
int ans = af ^ sf ^ ad ^ sd;
// printf("ans %d\n", ans);
return ans;
}
int main()
{
int n;
scanf("%d", &n);
id2rank[1] = 1;
rank2id[1] = 1;
for (int i = 2; i <= n; i++) {
now=i-1;
int L = 1, R = i;
while (L < R) {
int mid = L + R >> 1;
// printf("L %d R %d cmp %d %d\n",L,R,rank2id[mid],i);
if (!cmp(rank2id[mid], i)) {
L = mid + 1;
} else {
R = mid;
}
}
// L--;
// printf("L %d\n", L);
for (int x = i - 1; x >= L; x--) {
id2rank[rank2id[x]]++;
// rank2id[x+1]=rank2id[x];
}
id2rank[i] = L;
for (int x = 1; x <= i; x++)
rank2id[id2rank[x]] = x;
// rank2id[L]=i;
// puts("====");
// for (int x = 1; x <= n; x++) {
// printf(" %d", rank2id[x]);
// }
// puts("--");
}
printf("!");
for (int i = 1; i <= n; i++)
printf(" %d", rank2id[i]);
puts("");
fflush(stdout);
return 0;
}
Details
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Test #1:
score: 0
Wrong Answer
time: 1ms
memory: 3796kb
input:
3 0 1 0
output:
? 1 2 ? 2 3 ? 1 3 ! 3 1 2
result:
wrong answer Wa.