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#include "math/matrix/binary-basis.hpp"
template <typename T>
struct BinaryBasis {
vector<T> basis;
bool update;
BinaryBasis() : update(false) {}
bool add(T bit) {
for (auto &p : basis) {
bit = min(bit, bit ^ p);
}
if (bit) {
basis.emplace_back(bit);
return update = true;
} else {
return false;
}
}
bool check(T bit) const {
for (auto &p : basis) {
bit = min(bit, bit ^ p);
}
return bit == 0;
}
void normalize() {
sweep();
for (int i = (int)basis.size() - 1; i >= 0; i--) {
for (int j = i - 1; j >= 0; j--) chmin(basis[i], basis[i] ^ basis[j]);
}
}
void sweep() {
if (exchange(update, false)) {
sort(begin(basis), end(basis));
}
}
bool operator==(BinaryBasis<T> &a) {
normalize(), a.normalize();
return basis == a.basis;
}
T get_kth(int64_t k) { /* 0-indexed */
if ((1LL << basis.size()) <= k) {
return -1;
}
T ret = T();
sweep();
for (int i = (int)basis.size() - 1; i >= 0; i--) {
if (k < (1LL << i)) {
ret = min(ret, ret ^ basis[i]);
} else {
k -= 1LL << i;
ret = max(ret, ret ^ basis[i]);
}
}
return ret;
}
size_t size() const { return basis.size(); }
};
#line 1 "math/matrix/binary-basis.hpp"
template <typename T>
struct BinaryBasis {
vector<T> basis;
bool update;
BinaryBasis() : update(false) {}
bool add(T bit) {
for (auto &p : basis) {
bit = min(bit, bit ^ p);
}
if (bit) {
basis.emplace_back(bit);
return update = true;
} else {
return false;
}
}
bool check(T bit) const {
for (auto &p : basis) {
bit = min(bit, bit ^ p);
}
return bit == 0;
}
void normalize() {
sweep();
for (int i = (int)basis.size() - 1; i >= 0; i--) {
for (int j = i - 1; j >= 0; j--) chmin(basis[i], basis[i] ^ basis[j]);
}
}
void sweep() {
if (exchange(update, false)) {
sort(begin(basis), end(basis));
}
}
bool operator==(BinaryBasis<T> &a) {
normalize(), a.normalize();
return basis == a.basis;
}
T get_kth(int64_t k) { /* 0-indexed */
if ((1LL << basis.size()) <= k) {
return -1;
}
T ret = T();
sweep();
for (int i = (int)basis.size() - 1; i >= 0; i--) {
if (k < (1LL << i)) {
ret = min(ret, ret ^ basis[i]);
} else {
k -= 1LL << i;
ret = max(ret, ret ^ basis[i]);
}
}
return ret;
}
size_t size() const { return basis.size(); }
};