#include <bits/stdc++.h>
#define all(x) x.begin(), x.end()
#define pii pair<int, int>
#define x first
#define y second
using namespace std;
const int N = 1e5+5;
const int INF = 1e9;
const int sz = 10;
int n, m, q;
vector<int> g[N], topo;
vector<pii> block[N];
int pos[N], deg[N];
int d[N];
map<int, int> tod[N];
bool mark[N];
int getInt() {
int num = 0;
register int x = -1;
while(x < '0' || x > '9') x = getchar_unlock();
for(; x >= '0' && x <= '9'; x = getchar_unlock()) num = (num << 1) + (num << 3) + x - '0';
return num;
}
int main() {
n = getInt(); m = getInt(); q = getInt();
for(int i = 0, u, v; i < m; ++i) {
u = getInt(); v = getInt();
if(u > v) swap(u, v);
g[u].emplace_back(v);
deg[v]++;
}
queue<int> Q;
for(int i = 1; i <= n; ++i) if(!deg[i]) Q.emplace(i);
while(!Q.empty()) {
int u = Q.front(); Q.pop();
topo.emplace_back(u);
for(auto x : tod[u]) block[u].emplace_back(x);
block[u].emplace_back(u, 0);
sort(all(block[u]), [&](const pii &a, const pii &b) { return a.y > b.y; });
if(block[u].size() > sz) block[u].resize(sz);
for(int v : g[u]) {
for(pii x : block[u]) tod[v][x.x] = max(tod[v][x.x], x.y + 1);
if(!--deg[v]) Q.emplace(v);
}
}
for(int i = 0, u, t; i < q; ++i) {
scanf("%d %d", &u, &t);
vector<int> vec;
for(int i = 0, v; i < t; ++i) scanf("%d", &v), vec.emplace_back(v);
if(t < sz) {
for(int v : vec) mark[v] ^= 1;
bool st = true;
for(pii v : block[u]) if(!mark[v.x]) {
printf("%d\n", v.y), st = false;
break;
}
if(st) puts("-1");
for(int v : vec) mark[v] ^= 1;
} else {
memset(d, 0, sizeof d);
for(int v : vec) d[v] = -INF;
for(int i = 0; i < n; ++i) {
int u = topo[i];
for(int v : g[u]) d[v] = max(d[v], d[u] + 1);
}
printf("%d\n", d[u] < 0 ? -1 : d[u]);
}
}
}
Compilation message
bitaro.cpp: In function 'int getInt()':
bitaro.cpp:23:33: error: 'getchar_unlock' was not declared in this scope
while(x < '0' || x > '9') x = getchar_unlock();
^~~~~~~~~~~~~~
bitaro.cpp:23:33: note: suggested alternative: 'getchar_unlocked'
while(x < '0' || x > '9') x = getchar_unlock();
^~~~~~~~~~~~~~
getchar_unlocked
bitaro.cpp:24:35: error: 'getchar_unlock' was not declared in this scope
for(; x >= '0' && x <= '9'; x = getchar_unlock()) num = (num << 1) + (num << 3) + x - '0';
^~~~~~~~~~~~~~
bitaro.cpp:24:35: note: suggested alternative: 'getchar_unlocked'
for(; x >= '0' && x <= '9'; x = getchar_unlock()) num = (num << 1) + (num << 3) + x - '0';
^~~~~~~~~~~~~~
getchar_unlocked
bitaro.cpp: In function 'int main()':
bitaro.cpp:50:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &u, &t);
~~~~~^~~~~~~~~~~~~~~~~
bitaro.cpp:52:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i = 0, v; i < t; ++i) scanf("%d", &v), vec.emplace_back(v);
~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
