105 lines
1.9 KiB
C++
105 lines
1.9 KiB
C++
#include <bits/stdc++.h> // {{{
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// https://codeforces.com/blog/entry/96344
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#pragma GCC optimize("O2,unroll-loops")
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#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
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using namespace std;
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using i32 = int32_t;
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using u32 = uint32_t;
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using i64 = int64_t;
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using u64 = uint64_t;
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using f64 = double;
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using f128 = long double;
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#if __cplusplus >= 202002L
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template <typename T>
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constexpr T MIN = std::numeric_limits<T>::min();
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template <typename T>
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constexpr T MAX = std::numeric_limits<T>::max();
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template <typename T>
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[[nodiscard]] static T sc(auto&& x) {
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return static_cast<T>(x);
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}
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template <typename T>
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[[nodiscard]] static T sz(auto&& x) {
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return static_cast<T>(x.size());
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}
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#endif
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static void NO() {
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std::cout << "NO\n";
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}
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static void YES() {
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std::cout << "YES\n";
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}
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template <typename T>
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using vec = std::vector<T>;
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#define all(x) (x).begin(), (x).end()
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#define rall(x) (x).rbegin(), (x).rend()
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#define ff first
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#define ss second
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#ifdef LOCAL
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#define db(...) std::print(__VA_ARGS__)
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#define dbln(...) std::println(__VA_ARGS__)
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#else
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#define db(...)
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#define dbln(...)
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#endif
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// }}}
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void solve() {
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u32 n;
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cin >> n;
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vec<vec<u32>> tree(n + 1);
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for (u32 i = 2; i <= n; ++i) {
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u32 a;
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cin >> a;
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tree[i].push_back(a);
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tree[a].push_back(i);
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}
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string s;
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cin >> s;
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s = ' ' + s;
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auto dfs = [&](auto&& self, u32 u, u32 p) -> vec<u32> {
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vec<u32> dp(2);
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dp[0] = (s[u] == 'P') ? 1 << 30 : 0;
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dp[1] = (s[u] == 'S') ? 1 << 30 : 0;
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for (u32 v : tree[u]) {
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if (v == p)
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continue;
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auto prev = self(self, v, u);
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dp[0] += min(prev[0], prev[1] + 1);
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dp[1] += min(prev[1], prev[0] + 1);
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}
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return dp;
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};
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auto ans = dfs(dfs, 1, 0);
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cout << *min_element(all(ans)) << '\n';
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}
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int main() { // {{{
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cin.tie(nullptr)->sync_with_stdio(false);
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cin.exceptions(cin.failbit);
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u32 tc = 1;
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cin >> tc;
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for (u32 t = 0; t < tc; ++t) {
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solve();
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}
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return 0;
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}
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// }}}
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