이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#ifdef evenvalue
#include "debug.h"
#else
#define debug(...)
#endif
using int64 = long long;
using ld = long double;
template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using max_heap = priority_queue<T, vector<T>, less<T>>;
namespace Read {
int Int() {
int x;
cin >> x;
return x;
}
int64 Int64() {
int64 x;
cin >> x;
return x;
}
char Char() {
char c;
cin >> c;
return c;
}
string String() {
string s;
cin >> s;
return s;
}
double Double() {
return stod(String());
}
ld LongDouble() {
return stold(String());
}
template<typename T1, typename T2>
pair<T1, T2> Pair() {
pair<T1, T2> p;
cin >> p.first >> p.second;
return p;
}
template<typename T>
vector<T> Vec(const int n) {
vector<T> v(n);
for (T &x : v) {
cin >> x;
}
return v;
}
template<typename T>
vector<vector<T>> VecVec(const int n, const int m) {
vector<vector<T>> v(n);
for (vector<T> &vec : v) {
vec = Vec<T>(m);
}
return v;
}
}//namespace Read
constexpr int kInf = 1e9 + 10;
constexpr int64 kInf64 = 1e15 + 10;
constexpr int kMod = 1e9 + 7;
constexpr int kMaxN = 2e5 + 10;
constexpr int kSqrtN = 150;
inline void solution() {
const int n = Read::Int();
const int m = Read::Int();
const int q = Read::Int();
vector<basic_string<int>> in(n);
for (int i = 0; i < m; i++) {
const int x = Read::Int() - 1;
const int y = Read::Int() - 1;
in[y].push_back(x);
}
vector<bool> busy(n);
vector<vector<pair<int, int>>> best_paths(n);
for (int x = 0; x < n; x++) {
vector<pair<int, int>> best;
if (not busy[x]) best.emplace_back(-1, x);
for (const int y : in[x]) {
best.insert(best.end(), best_paths[y].begin(), best_paths[y].end());
}
sort(best.rbegin(), best.rend());
for (const auto [dist, y] : best) {
if (busy[y]) continue;
busy[y] = true;
best_paths[x].emplace_back(dist + 1, y);
if (best_paths[x].size() == kSqrtN) break;
}
for (const auto [dist, y] : best_paths[x]) {
busy[y] = false;
}
}
vector<int> dp(n);
for (int qry = 0; qry < q; qry++) {
const int x = Read::Int() - 1;
const vector<int> nerds = Read::Vec<int>(Read::Int());
for (const int nerd : nerds) {
busy[nerd - 1] = true;
}
if (nerds.size() >= kSqrtN) {
fill(dp.begin(), dp.begin() + x + 1, 0);
for (const int nerd : nerds) {
dp[nerd - 1] = -kInf;
}
for (int y = 0; y <= x; y++) {
for (const int z : in[y]) {
dp[y] = max(dp[y], dp[z] + 1);
}
}
cout << max(dp[x], -1) << '\n';
} else {
bool found = false;
for (const auto [dist, y] : best_paths[x]) {
if (busy[y]) continue;
found = true;
cout << dist << '\n';
break;
}
if (not found) cout << -1 << '\n';
}
for (const int nerd : nerds) {
busy[nerd - 1] = false;
}
}
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
//freopen(".in", "r", stdin);
//freopen(".out", "w", stdout);
cout << fixed << setprecision(10);
int testcases = 1;
//cin >> testcases;
while (testcases--) {
solution();
}
}
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