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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#398269 | #5434. Binary Substrings | caijianhong | WA | 2ms | 16548kb | C++20 | 1.8kb | 2024-04-25 10:07:17 | 2024-04-25 10:07:18 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#define debug(...) fprintf(stderr, ##__VA_ARGS__)
#else
#define endl "\n"
#define debug(...) void(0)
#endif
typedef long long LL;
int n, k, to[1000010], repr[1000010], bel[1000010];
vector<int> g[1000010];
vector<int> ans;
void dfs(int u) {
while (!g[u].empty()) {
int v = g[u].back();
g[u].pop_back();
dfs(v);
ans.push_back(v & 1);
}
}
int main() {
#ifndef LOCAL
cin.tie(nullptr)->sync_with_stdio(false);
#endif
cin >> n;
if (n == 1) return cout << "1" << endl, 0;
if (n == 2) return cout << "10" << endl, 0;
while (k + (1 << (k + 1)) <= n) ++k;
int pk1 = 1 << (k - 1), pk2 = pk1 << 2, pk = pk2 >> 1;
for (int i = 0; i < pk1; i++) {
g[i] = {(i << 1 | 1) % pk1, (i << 1) % pk1};
}
dfs(0);
reverse(ans.begin(), ans.end());
ans.insert(ans.begin(), k - 1, 0);
memset(to, -1, sizeof to);
int lst = 0;
for (int i = 0, now = 0; i < ans.size(); i++) {
now = (now << 1 | ans[i]) % pk2;
if (i >= k) to[lst] = now;
lst = now;
}
to[lst] = (lst << 1) % pk2;
for (int i = 0; i < pk; i++) {
if (~to[i] && to[i + pk] == -1) to[i + pk] = to[i] ^ 1;
if (~to[i + pk] && to[i] == -1) to[i] = to[i + pk] ^ 1;
}
memset(repr, -1, sizeof repr);
memset(bel, -1, sizeof bel);
for (int i = 0; i < pk2; i++) {
if (~repr[i]) continue;
bel[i] = i;
for (int j = i; repr[j] == -1; j = to[j]) repr[j] = i;
}
for (int i = 0; i < pk; i++) {
if (bel[repr[i]] != bel[repr[i + pk]]) {
int u = repr[i], v = repr[i + pk];
if (bel[v] == 0) swap(u, v);
bel[v] = u;
swap(to[i], to[i + pk]);
}
}
ans.assign(k - 1, 0);
for (int now = 0; ans.size() < n; now = to[now]) ans.push_back(now & 1);
for (int x : ans) cout << x;
cout << endl;
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 2ms
memory: 3716kb
input:
2
output:
10
result:
ok meet maximum 3
Test #2:
score: -100
Wrong Answer
time: 0ms
memory: 16548kb
input:
5
output:
00101
result:
wrong answer not meet maximum 11 < 12