bool home = 1;
bool verbose = 1;
#include <bits/stdc++.h>
using namespace std;
mt19937 rng(7777);
typedef double ld;
const ld PI = 3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196442881097566593344612847564823378678316527120190914;
using cd = complex<ld>;
int getlog2(int x) {
if (x == 1) return 0;
assert(x >= 2);
assert(x % 2 == 0);
return 1 + getlog2(x / 2);
}
void fft(vector<cd>& a, bool inv) {
int n = (int)a.size(), k = getlog2(n);
assert((1 << k) == n);
for (int i = 0; i < n; i++) {
int j = 0;
for (int bit = 0; bit < k; bit++) {
if (i & (1 << bit)) {
j += (1 << (k - 1 - bit));
}
}
if (i < j) {
swap(a[i], a[j]);
}
}
for (int l = 2; l <= n; l *= 2) {
ld ang = 2 * PI / (ld)l;
if (inv) ang *= -1;
cd mlt(cos(ang), sin(ang));
for (int i = 0; i < n; i += l) {
cd cur(1);
for (int j = 0; j < l / 2; j++) {
cd x = a[i + j];
cd y = a[i + l / 2 + j] * cur;
a[i + j] = x + y;
a[i + l / 2 + j] = x - y;
cur *= mlt;
}
}
}
if (inv) {
for (auto& x : a) {
x /= n;
}
}
}
void conv_smart(vector<cd> x, vector<cd> y, vector<cd> &sol) {
int n = 1;
while (n <= (int)x.size() + (int)y.size()) n *= 2;
x.resize(n, 0);
y.resize(n, 0);
vector<cd> a(x.begin(), x.end());
vector<cd> b(y.begin(), y.end());
fft(a, 0);
fft(b, 0);
for (int i = 0; i < n; i++) a[i] *= b[i];
fft(a, 1);
sol.clear();
for (int i = 0; i < n; i++) {
sol.push_back(a[i]);
}
}
ld values[26];
const ld eps = 1e-6;
vector<cd> lol, cs, a;
vector<ld> place(string s, int len) {
int n = (int) s.size();
if (len > n) {
return {};
}
ld ang = 2 * PI / len;
cd c(cos(ang), sin(ang));
cs.resize(len);
a.resize(n);
cs[0] = 1;
for (int i = 1; i < len; i++) {
cs[i] = cs[i - 1] * c;
}
for (int i = 0; i < n; i++) {
a[i] = values[s[i] - 'a'];
}
vector<ld> sol(n - len + 1);
conv_smart(cs, a, lol);
for (int i = 0; i < n - len + 1; i++) {
sol[i] = norm(lol[i + len - 1]);
}
return sol;
}
string s, t;
bool isok(int len) {
vector<ld> norms_s = place(s, len);
vector<ld> norms_t = place(t, len);
int n = (int) norms_s.size();
int m = (int) norms_t.size();
sort(norms_s.begin(), norms_s.end());
sort(norms_t.begin(), norms_t.end());
int j = 0;
for (int i = 0; i < n; i++) {
while (j < m && norms_t[j] < norms_s[i]) {
j++;
}
if (0 <= j && j < m && abs(norms_s[i] - norms_t[j]) < eps) {
return 1;
}
if (0 <= j - 1 && j - 1 < m && abs(norms_s[i] - norms_t[j - 1]) < eps) {
return 1;
}
}
return 0;
}
void print(int len) {
vector<ld> norms_s = place(s, len);
vector<ld> norms_t = place(t, len);
int n = (int) norms_s.size();
int m = (int) norms_t.size();
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
if (abs(norms_s[i] - norms_t[j]) < eps) {
cout << i << " " << j << "\n";
exit(0);
}
}
}
}
int main() {
for (int x = 0; x < 26; x++) {
values[x] = cos(rng()) * 10;
}
if (!home) {
verbose = 0;
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
}
if (home) {
verbose = 1;
freopen ("___input___.txt", "r", stdin);
}
cin >> s >> t;
int n = (int) s.size(), m = (int) t.size();
int len = min(n, m);
while (!isok(len)) {
///cout << "len = " << len << "\n";
len--;
}
cout << len << "\n";
print(len);
return 0;
}
Compilation message
necklace.cpp: In function 'int main()':
necklace.cpp:171:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
171 | freopen ("___input___.txt", "r", stdin);
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
1 ms |
340 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
