97 lines
1.8 KiB
C++
97 lines
1.8 KiB
C++
#include <bits/stdc++.h> // {{{
|
|
|
|
// https://codeforces.com/blog/entry/96344
|
|
|
|
#pragma GCC optimize("O2,unroll-loops")
|
|
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
|
|
|
|
using namespace std;
|
|
|
|
using i32 = int32_t;
|
|
using u32 = uint32_t;
|
|
using i64 = int64_t;
|
|
using u64 = uint64_t;
|
|
using f64 = double;
|
|
using f128 = long double;
|
|
|
|
template <typename T>
|
|
constexpr T MIN = std::numeric_limits<T>::min();
|
|
|
|
template <typename T>
|
|
constexpr T MAX = std::numeric_limits<T>::max();
|
|
|
|
template <typename T>
|
|
[[nodiscard]] static T sc(auto&& x) {
|
|
return static_cast<T>(x);
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] static T sz(auto&& x) {
|
|
return static_cast<T>(x.size());
|
|
}
|
|
|
|
static void NO() {
|
|
std::cout << "NO\n";
|
|
}
|
|
|
|
static void YES() {
|
|
std::cout << "YES\n";
|
|
}
|
|
|
|
#define all(x) (x).begin(), (x).end()
|
|
#define rall(x) (x).rbegin(), (x).rend()
|
|
#define ff first
|
|
#define ss second
|
|
|
|
#ifdef LOCAL
|
|
#define db(...) std::print(__VA_ARGS__)
|
|
#define dbln(...) std::println(__VA_ARGS__)
|
|
#else
|
|
#define db(...)
|
|
#define dbln(...)
|
|
#endif
|
|
// }}}
|
|
|
|
void solve() {
|
|
vector<u32> shell_locs(3), shell_counts(3, 0);
|
|
iota(all(shell_locs), 0);
|
|
|
|
u32 n, a, b, g;
|
|
cin >> n;
|
|
for (u32 i = 0; i < n; ++i) {
|
|
cin >> a >> b >> g;
|
|
|
|
--a;
|
|
--b;
|
|
--g;
|
|
for (u32 j = 0; j < shell_locs.size(); ++j) {
|
|
if (shell_locs[j] == a)
|
|
shell_locs[j] = b;
|
|
else if (shell_locs[j] == b)
|
|
shell_locs[j] = a;
|
|
shell_counts[j] += shell_locs[j] == g;
|
|
}
|
|
}
|
|
|
|
cout << *max_element(all(shell_counts)) << '\n';
|
|
}
|
|
|
|
int main() { // {{{
|
|
cin.tie(nullptr)->sync_with_stdio(false);
|
|
cin.exceptions(cin.failbit);
|
|
|
|
#define PROBLEM_NAME "shell"
|
|
|
|
#ifdef LOCAL
|
|
freopen("io/" PROBLEM_NAME ".in", "r", stdin);
|
|
freopen("io/" PROBLEM_NAME ".out", "w", stdout);
|
|
#else
|
|
freopen(PROBLEM_NAME ".in", "r", stdin);
|
|
freopen(PROBLEM_NAME ".out", "w", stdout);
|
|
#endif
|
|
|
|
solve();
|
|
|
|
return 0;
|
|
}
|
|
// }}}
|