// #pragma GCC target ("avx,avx2,fma")
// #pragma GCC optimize ("Ofast,inline") // O1 - O2 - O3 - Os - Ofast
// #pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define rep(i, a, b) for (int i = (a); i < (b); ++i)
#define per(i, a, b) for (int i = (b - 1); i >= (a); --i)
#define trav(a, x) for (auto &a : x)
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define pb push_back
#define debug(x) cout << #x << " = " << x << endl
#define umap unordered_map
#define uset unordered_set
typedef pair<int, int> ii;
typedef pair<int, ii> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
typedef vector<pll> vpll;
const ll INF = 1'000'000'007, MAXN = 3000;
const ll num_bases = 2, bases[] = {31, 47};
ll base_pow[num_bases][MAXN];
string jill, jane;
int main() {
cin.tie(0)->sync_with_stdio(0);
cin.exceptions(cin.failbit);
rep(i, 0, num_bases) base_pow[i][0] = 1;
rep(i, 0, num_bases) rep(j, 1, MAXN) base_pow[i][j] = base_pow[i][j - 1] * bases[i] % INF;
cin >> jill >> jane;
map<ii, int> possible;
int n = min(sz(jill), sz(jane));
int lo = 0, hi = n;
int start_jill = 0, start_jane = 0;
while (lo != hi) {
int mid = (lo + hi + 1) / 2;
vll hash_val = {0, 0};
rep(j, 0, num_bases) rep(i, 0, mid - 1) hash_val[j] = (hash_val[j] * bases[j] + jill[i]) % INF;
rep(i, mid - 1, sz(jill)) {
rep(j, 0, num_bases) hash_val[j] = (hash_val[j] * bases[0] + jill[i]) % INF;
possible.insert({{hash_val[0], hash_val[1]}, i - mid + 1});
rep(j, 0, num_bases) hash_val[j] = ((hash_val[j] - base_pow[j][mid - 1] * jill[i - mid + 1]) % INF + INF) % INF;
}
int sjill = -1, sjane = -1;
rep(k, 0, 2) {
hash_val = {0, 0};
rep(j, 0, num_bases) rep(i, 0, mid - 1) hash_val[j] = (hash_val[j] * bases[j] + jane[i]) % INF;
rep(i, mid - 1, sz(jane)) {
rep(j, 0, num_bases) hash_val[j] = (hash_val[j] * bases[0] + jane[i]) % INF;
vll tmp_val = hash_val;
rep(j, 0, mid) {
if (possible.count({tmp_val[0], tmp_val[1]})) {
if (k) {
sjane = i - mid + 1;
sjane = sz(jane) - sjane;
sjane -= mid;
} else
sjane = i - mid + 1;
sjill = possible[{tmp_val[0], tmp_val[1]}];
}
rep(base, 0, 2) {
tmp_val[base] = ((tmp_val[base] - base_pow[base][mid - 1] * jane[i - mid + 1 + j]) % INF + INF) % INF;
tmp_val[base] = (tmp_val[base] * bases[base] + jane[i - mid + 1 + j]) % INF;
}
}
rep(j, 0, num_bases) hash_val[j] = ((hash_val[j] - base_pow[j][mid - 1] * jane[i - mid + 1]) % INF + INF) % INF;
}
reverse(all(jane));
}
if (sjill == -1)
hi = mid - 1;
else {
lo = mid;
start_jill = sjill;
start_jane = sjane;
}
possible.clear();
}
string s1 = jill.substr(start_jill, lo);
string s2 = jane.substr(start_jane, lo);
bool yes = 0;
rep(k, 0, 2) {
string cur = s2 + s2;
rep(i, 0, lo) if (s1 == cur.substr(i, lo)) yes = 1;
reverse(all(s2));
}
cout << lo << endl;
cout << start_jill << ' ' << start_jane << endl;
return 0;
}
Compilation message
necklace.cpp: In function 'int main()':
necklace.cpp:8:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
8 | #define rep(i, a, b) for (int i = (a); i < (b); ++i)
| ^
necklace.cpp:56:9: note: in expansion of macro 'rep'
56 | rep(i, mid - 1, sz(jill)) {
| ^~~
necklace.cpp:8:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
8 | #define rep(i, a, b) for (int i = (a); i < (b); ++i)
| ^
necklace.cpp:67:13: note: in expansion of macro 'rep'
67 | rep(i, mid - 1, sz(jane)) {
| ^~~
necklace.cpp:105:10: warning: variable 'yes' set but not used [-Wunused-but-set-variable]
105 | bool yes = 0;
| ^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
332 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
