#include <iostream>
#include <algorithm>
#include <vector>
#include <random>
#include <chrono>
#include <set>
#include <map>
#include <stack>
#include <functional>
#include <iomanip>
#include <queue>
#include <cassert>
#include <complex>
#include <cstring>
#include <memory>
#include <bitset>
#include <sstream>
#include <cmath>
#include <numeric>
#include <numbers>
#include <fstream>
using namespace std;
#ifndef template
#ifndef define
#define ll long long
#define ld long double
#define pl pair<ll, ll>
#define pi pair<int, int>
#define nl cout << '\n';
#define x first
#define y second
#define cbit(x) __builtin_popcountll(x)
#define uid(a, b) uniform_int_distribution<ll>(a, b)(rng)
#define siz(x) (int)x.size()
#endif
#ifndef print
void print(size_t x) {cout << x << ' ';}
void print(int x) {cout << x << ' ';}
void print(long long x) {cout << x << ' ';}
void print(float x) {cout << x << ' ';}
void print(long double x) {cout << x << ' ';}
void print(char x) {cout << x << ' ';}
void print(const char* x) {cout << x << ' ';}
void print(bool x) {cout << x << ' ';}
void print(string &x) {cout << x << ' ';}
template<typename T, typename V>
void print(pair<T, V> &p) {print(p.x); print(p.y);}
template<typename T>
void print(vector<T> v) {for (int i = 0; i < v.size(); i++) print(v[i]);}
template<typename T>
void print(vector<vector<T>> v) {
for (int i = 0; i < v.size(); i++){
for (int j = 0; j < v[i].size(); j++)
print(v[i][j]);
nl;
}
}
template <typename T, typename... V>
void print(T t, V&&... v) {print(t); print(v...);}
#endif
#ifndef read
void read(int &x) {cin >> x;}
void read(long long &x) {cin >> x;}
void read(unsigned &x) {cin >> x;}
void read(unsigned long long &x) {cin >> x;}
void read(float &x) {cin >> x;}
void read(long double &x) {cin >> x;}
void read(char &x) {cin >> x;}
void read(string &x) {cin >> x;}
void read(bool &x) {cin >> x;}
template<typename T>
void read(vector<T> &v) {
for (int i = 0; i < v.size(); i++)
read(v[i]);
}
template <typename T, typename... V>
void read(T &t, V&... v) {read(t); read(v...);}
#endif
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> bool maxi(T& a, const T& b) {
return a < b ? a = b, 1 : 0;
}
template<class T> bool mini(T& a, const T& b) {
return a > b ? a = b, 1 : 0;
}
template<class... Args>
auto vec(size_t n, Args&&... args) {
if constexpr(sizeof...(args) == 1)
return vector(n, args...);
else
return vector(n, vec(args...));
}
#endif
using namespace std;
const ll inf = 1e18;
const ll def = 1e5+1;
const ll mod = 1e9+9;
using namespace std;
int block = 300;
vector<vector<pi>> best(def);
void solve(){
int n, m, q;
read(n, m, q);
vector<vector<int>> edg(n);
for (int i = 0; i < m; i++){
int u, v;
read(u, v);
u--; v--;
edg[v].push_back(u);
}
for (int i = 0; i < n; i++)
best[i].push_back({0, i});
auto marked = vec(n, 0);
for (int u = 0; u < n; u++){
for (int v : edg[u]){
vector<pi> newbest;
int j = 0;
for (int i = 0; i <= best[v].size(); i++){
while (j < best[u].size() && (best[u][j].x > best[v][i].x + 1 || i == best[v].size())){
if (newbest.size() == block)
break;
if (!marked[best[u][j].y])
newbest.push_back(best[u][j]);
marked[best[u][j++].y] = 1;
}
if (newbest.size() == block || i == best[v].size())
break;
if (!marked[best[v][i].y])
newbest.push_back({best[v][i].x + 1, best[v][i].y});
marked[best[v][i].y] = 1;
}
for (auto it : newbest)
marked[it.y] = 0;
best[u] = newbest;
}
}
while (q--){
int u, s;
read(u, s);
u--;
vector<int> blocked(s);
read(blocked);
for (int x : blocked)
marked[x - 1] = 1;
int res = -1;
if (s < block){
for (int i = 0; i < best[u].size(); i++){
if (marked[best[u][i].y])
continue;
res = best[u][i].x;
break;
}
}
else{
auto dp = vec(n, -1);
for (int i = 0; i < n; i++){
if (marked[i])
continue;
maxi(dp[i], 0);
for (int v : edg[i])
maxi(dp[i], dp[v] + 1);
}
res = dp[u];
}
for (int x : blocked)
marked[x - 1] = 0;
print(res); nl;
}
}
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
if (ifstream("input.txt").good()){
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
}
int t = 1;
while (t--){
solve();
nl;
}
return 0;
}
Compilation message (stderr)
bitaro.cpp: In function 'int32_t main()':
bitaro.cpp:197:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
197 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:198:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
198 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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