This documentation is automatically generated by online-judge-tools/verification-helper
// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/discrete_logarithm_mod
#include "../../template/template.hpp"
#include "../../math/combinatorics/mod-log.hpp"
int main() {
int T;
cin >> T;
while(T--) {
int64_t X, Y, M;
cin >> X >> Y >> M;
cout << mod_log(X, Y, M) << endl;
}
}
#line 1 "test/verify/yosupo-discrete-logarithm-mod.test.cpp"
// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/discrete_logarithm_mod
#line 1 "template/template.hpp"
#include <bits/stdc++.h>
using namespace std;
using int64 = long long;
const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;
struct IoSetup {
IoSetup() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
cout << fixed << setprecision(10);
cerr << fixed << setprecision(10);
}
} iosetup;
template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
os << p.first << " " << p.second;
return os;
}
template <typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) {
is >> p.first >> p.second;
return is;
}
template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v) {
for (int i = 0; i < (int)v.size(); i++) {
os << v[i] << (i + 1 != v.size() ? " " : "");
}
return os;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v) {
for (T &in : v) is >> in;
return is;
}
template <typename T1, typename T2>
inline bool chmax(T1 &a, T2 b) {
return a < b && (a = b, true);
}
template <typename T1, typename T2>
inline bool chmin(T1 &a, T2 b) {
return a > b && (a = b, true);
}
template <typename T = int64>
vector<T> make_v(size_t a) {
return vector<T>(a);
}
template <typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}
template <typename T, typename V>
typename enable_if<is_class<T>::value == 0>::type fill_v(T &t, const V &v) {
t = v;
}
template <typename T, typename V>
typename enable_if<is_class<T>::value != 0>::type fill_v(T &t, const V &v) {
for (auto &e : t) fill_v(e, v);
}
template <typename F>
struct FixPoint : F {
explicit FixPoint(F &&f) : F(forward<F>(f)) {}
template <typename... Args>
decltype(auto) operator()(Args &&...args) const {
return F::operator()(*this, forward<Args>(args)...);
}
};
template <typename F>
inline decltype(auto) MFP(F &&f) {
return FixPoint<F>{forward<F>(f)};
}
#line 4 "test/verify/yosupo-discrete-logarithm-mod.test.cpp"
#line 1 "math/combinatorics/mod-log.hpp"
/**
* @brief Mod Log(離散対数問題)
*
*/
int64_t mod_log(int64_t a, int64_t b, int64_t p) {
int64_t g = 1;
for (int64_t i = p; i; i /= 2) (g *= a) %= p;
g = __gcd(g, p);
int64_t t = 1, c = 0;
for (; t % g; c++) {
if (t == b) return c;
(t *= a) %= p;
}
if (b % g) return -1;
t /= g;
b /= g;
int64_t n = p / g, h = 0, gs = 1;
for (; h * h < n; h++) (gs *= a) %= n;
unordered_map<int64_t, int64_t> bs;
for (int64_t s = 0, e = b; s < h; bs[e] = ++s) {
(e *= a) %= n;
}
for (int64_t s = 0, e = t; s < n;) {
(e *= gs) %= n;
s += h;
if (bs.count(e)) return c + s - bs[e];
}
return -1;
}
#line 6 "test/verify/yosupo-discrete-logarithm-mod.test.cpp"
int main() {
int T;
cin >> T;
while(T--) {
int64_t X, Y, M;
cin >> X >> Y >> M;
cout << mod_log(X, Y, M) << endl;
}
}
Env | Name | Status | Elapsed | Memory |
---|---|---|---|---|
g++ | even_mod_00 | AC | 149 ms | 5 MB |
g++ | even_mod_01 | AC | 188 ms | 5 MB |
g++ | even_mod_impossible_00 | AC | 6 ms | 4 MB |
g++ | even_mod_impossible_01 | AC | 6 ms | 4 MB |
g++ | example_00 | AC | 6 ms | 4 MB |
g++ | max_random_00 | AC | 228 ms | 5 MB |
g++ | max_random_01 | AC | 218 ms | 5 MB |
g++ | max_random_02 | AC | 192 ms | 5 MB |
g++ | random_00 | AC | 69 ms | 5 MB |
g++ | random_01 | AC | 111 ms | 5 MB |
g++ | random_02 | AC | 147 ms | 5 MB |
g++ | small_00 | AC | 6 ms | 4 MB |
g++ | small_01 | AC | 6 ms | 4 MB |
g++ | small_02 | AC | 6 ms | 4 MB |
clang++ | even_mod_00 | AC | 147 ms | 5 MB |
clang++ | even_mod_01 | AC | 186 ms | 5 MB |
clang++ | even_mod_impossible_00 | AC | 6 ms | 4 MB |
clang++ | even_mod_impossible_01 | AC | 6 ms | 4 MB |
clang++ | example_00 | AC | 6 ms | 4 MB |
clang++ | max_random_00 | AC | 229 ms | 5 MB |
clang++ | max_random_01 | AC | 217 ms | 5 MB |
clang++ | max_random_02 | AC | 193 ms | 5 MB |
clang++ | random_00 | AC | 68 ms | 5 MB |
clang++ | random_01 | AC | 111 ms | 5 MB |
clang++ | random_02 | AC | 147 ms | 5 MB |
clang++ | small_00 | AC | 6 ms | 4 MB |
clang++ | small_01 | AC | 6 ms | 4 MB |
clang++ | small_02 | AC | 6 ms | 4 MB |