This commit is contained in:
Barrett Ruth 2025-10-09 21:52:13 -04:00
parent d923953692
commit 02eaf3965e
36 changed files with 49 additions and 1242 deletions

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@ -39,14 +39,34 @@ template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
// }}}
void solve() {
int n;
cin >> n;
u32 n;
string s;
cin >> s;
int ans = n - 1;
for (int i = 0; i < n - 2; ++i) {
ans -= s[i] == s[i + 2];
}
cin >> n >> s;
u64 ans = MAX<u64>;
auto f = [&](string &t) {
vector<u64> pos;
for (u64 i = 0; i < n; i++)
if (t[i] == 'a')
pos.push_back(i);
u64 m = pos.size();
vector<u64> pref(m + 1), suff(m + 1);
for (u64 i = 0; i < m; i++)
pref[i + 1] = pref[i] + pos[i] - i;
for (u64 i = m; i--;)
suff[i] = suff[i + 1] + (n - (m - i)) - pos[i];
for (u64 i = 0; i <= m; i++)
ans = min<u64>(ans, pref[i] + suff[i]);
};
f(s);
transform(s.begin(), s.end(), s.begin(),
[](char c) { return c ^ 'a' ^ 'b'; });
f(s);
cout << ans << '\n';
}

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@ -0,0 +1,11 @@
5
4
abab
6
bababa
7
abababa
2
ab
1
b

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@ -0,0 +1,11 @@
5
4
abab
6
bababa
7
abababa
2
ab
1
b

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@ -1,86 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
constexpr string meow{"meow"};
void solve() {
u32 n;
cin >> n;
string s;
cin >> s;
u32 i = 0, j = 0;
while (j < meow.size() && i < n && tolower(s[i]) == meow[j]) {
while (i < n && tolower(s[i]) == meow[j])
++i;
++j;
}
if (i == n && j == meow.size()) {
cout << "YES";
} else {
cout << "NO";
}
cout << '\n';
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,89 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
void solve() {
u32 n, k;
cin >> n >> k;
string s;
cin >> s;
vector<i32> f(26, 0);
u32 ans = 0;
for (auto letter : s) {
if (isupper(letter)) {
if (f[letter - 'a']++ < 0) {
++ans;
}
} else {
if (f[letter]-- > 0) {
++ans;
}
}
}
u32 matches = 0;
// for (auto freq : f) {
// matches += freq / 2;
// }
cout << ans + min(k, matches) << '\n';
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,66 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T>
constexpr T MIN = std::numeric_limits<T>::min();
template <typename T>
constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
void solve() {
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,67 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T>
constexpr T MIN = std::numeric_limits<T>::min();
template <typename T>
constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
void solve() {
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,67 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T>
constexpr T MIN = std::numeric_limits<T>::min();
template <typename T>
constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
void solve() {
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,95 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
bitset<2 * 100000> seen;
void solve() {
seen.reset();
u32 n, k;
cin >> n >> k;
string s, t;
cin >> s >> t;
u32 ans = 0;
vector<u32> f(26, 0);
auto dfs = [&](auto &&self, i32 i) -> void {
if (i < 0 || i >= n || seen[i])
return;
seen[i] = true;
++f[s[i] - 'a'];
--f[t[i] - 'a'];
for (auto d : {i - k, i - k - 1, i + k, i + k + 1}) {
self(self, d);
}
};
bool ok = true;
for (i32 i = 0; i < n && ok; ++i) {
if (!seen[i]) {
dfs(dfs, i);
ok &= count(f.begin(), f.end(), 0) == 26;
f.assign(26, 0);
}
}
cout << (ok ? "YES" : "NO") << '\n';
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,94 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
vector<u32> parities(200000, 0);
vector<bitset<32>> present(200000);
void solve() {
u32 n;
cin >> n;
string s;
for (u32 i = 0; i < n; ++i) {
cin >> s;
for (auto c : s) {
parities[i] ^= 1 << (c - 'a');
present[i].set(c - 'a');
}
}
u64 ans = 0;
unordered_map<u32, u64> f;
for (u32 c = 0; c < 26; ++c) {
u32 mask = ((1 << 26) - 1) ^ (1 << c);
for (u32 i = 0; i < n; i++) {
if (present[i].test(c))
continue;
ans += f[parities[i] ^ mask];
++f[parities[i]];
}
f.clear();
}
cout << ans << '\n';
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
// std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,67 +0,0 @@
#include <bits/stdc++.h> // {{{
#include <version>
#ifdef __cpp_lib_ranges_enumerate
#include <ranges>
namespace rv = std::views;
namespace rs = std::ranges;
#endif
// https://codeforces.com/blog/entry/96344
#pragma GCC optimize("O2,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f64 = double;
using f128 = long double;
#if __cplusplus >= 202002L
template <typename T>
constexpr T MIN = std::numeric_limits<T>::min();
template <typename T>
constexpr T MAX = std::numeric_limits<T>::max();
#endif
#ifdef LOCAL
#define db(...) std::print(__VA_ARGS__)
#define dbln(...) std::println(__VA_ARGS__)
#else
#define db(...)
#define dbln(...)
#endif
// }}}
void solve() {
}
int main() { // {{{
std::cin.exceptions(std::cin.failbit);
#ifdef LOCAL
std::cerr.rdbuf(std::cout.rdbuf());
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
#else
std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
u32 tc = 1;
std::cin >> tc;
for (u32 t = 0; t < tc; ++t) {
solve();
}
return 0;
}
// }}}

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@ -1,15 +0,0 @@
7
4
meOw
14
mMmeoOoWWWwwwW
3
mew
7
MmeEeUw
4
MEOW
6
MmyaVW
5
meowA

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@ -1,7 +0,0 @@
YES
YES
NO
NO
YES
NO
NO

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@ -1,11 +0,0 @@
5
11 2
aAaaBACacbE
2 2
ab
4 1
aaBB
6 0
abBAcC
5 3
cbccb

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@ -1,5 +0,0 @@
5
0
1
3
2

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@ -1,11 +0,0 @@
5
5
3 3 3 0 0
6
0 3 3 0 0 3
7
1 2 3 0 4 5 0
7
1 2 5 0 4 3 0
5
3 1 0 0 4

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@ -1,5 +0,0 @@
6
6
8
9
4

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@ -1,11 +0,0 @@
5
5
3 3 3 0 0
6
0 3 3 0 0 3
7
1 2 3 0 4 5 0
7
1 2 5 0 4 3 0
5
3 1 0 0 4

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@ -1,5 +0,0 @@
6
6
8
9
4

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@ -1,15 +0,0 @@
7
6
aaabcc
10
aaaaaaaaaa
6
abcdef
7
abacaba
6
cccfff
4
abba
5
ababa

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@ -1,7 +0,0 @@
4
1
5
3
3
3
1

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@ -1,22 +0,0 @@
7
6 3
talant
atltna
7 3
abacaba
aaaabbc
12 3
abracadabraa
avadakedavra
5 3
accio
cicao
5 3
lumos
molus
4 3
uwjt
twju
4 3
kvpx
vxpk

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@ -1,7 +0,0 @@
YES
YES
NO
YES
NO
YES
NO

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@ -1,22 +0,0 @@
7
6 3
talant
atltna
7 1
abacaba
aaaabbc
12 6
abracadabraa
avadakedavra
5 3
accio
cicao
5 4
lumos
molus
4 3
uwjt
twju
4 3
kvpx
vxpk

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@ -1,7 +0,0 @@
YES
YES
NO
YES
NO
YES
NO

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@ -1,11 +0,0 @@
10
ftl
abcdefghijklmnopqrstuvwxy
abcdeffghijkllmnopqrsttuvwxy
ffftl
aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyy
thedevid
bcdefghhiiiijklmnopqrsuwxyz
gorillasilverback
abcdefg
ijklmnopqrstuvwxyz

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@ -1 +0,0 @@
5

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@ -1,44 +0,0 @@
6
6
1 5
1 6
1 2
2 3
2 4
7
1 5
1 3
3 6
1 4
4 7
4 2
9
1 2
2 4
2 3
3 5
1 7
7 6
7 8
8 9
10
2 9
9 10
2 3
6 7
4 3
1 2
3 8
2 5
6 5
10
3 2
8 10
9 7
4 2
8 2
2 1
4 5
6 5
5 7
1

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@ -1,6 +0,0 @@
YES
NO
YES
NO
NO
YES