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;
const int MXN = 2e5 + 5;
const int B = 500;
int n, m, q;
vector<int> adj[MXN];
int used[MXN], dp[MXN], inq[MXN], in[MXN];
vector<array<int, 2>> b[MXN];
vector<int> o;
void init(int a)
{
used[a] = 1;
b[a].push_back({0, a});
vector<array<int, 2>> nw;
for (int v : adj[a])
{
if (!used[v]) init(v);
nw.clear();
int i = 0, j = 0;
while (nw.size() < B + 1 && i < b[a].size() && j < b[v].size())
{
if (in[b[a][i][1]])
{
i++;
continue;
}
if (in[b[v][j][1]])
{
j++;
continue;
}
if (b[a][i][0] > b[v][j][0] + 1) nw.push_back(b[a][i]), in[b[a][i++][1]] = 1;
else nw.push_back({b[v][j][0] + 1, b[v][j][1]}), in[b[v][j++][1]] = 1;
}
while (nw.size() < B + 1 && i < b[a].size()) if (in[b[a][i][1]] && ++i) continue; else nw.push_back(b[a][i]), in[b[a][i++][1]] = 1;
while (nw.size() < B + 1 && j < b[v].size()) if (in[b[v][j][1]] && ++j) continue; else nw.push_back({b[v][j][0] + 1, b[v][j][1]}), in[b[v][j++][1]] = 1;
swap(nw, b[a]);
for (array<int, 2> &i : b[a]) in[i[1]] = 0;
}
}
void dfs(int a)
{
used[a] = 1;
for (int v : adj[a])
{
if (used[v]) continue;
dfs(v);
}
o.push_back(a);
}
void _()
{
cin >> n >> m >> q;
for (int i = 0; i < m; i++)
{
int u, v;
cin >> u >> v;
adj[v].push_back(u);
}
for (int i = n; i >= 1; i--)
{
if (!used[i]) init(i);
}
while (q--)
{
int t, sz;
cin >> t >> sz;
vector<int> v(sz);
for (int &i : v) cin >> i, inq[i] = 1;
if (sz > B)
{
o.clear();
for (int i = 1; i <= n; i++) used[i] = 0, dp[i] = 0;
dfs(t);
reverse(o.begin(), o.end());
int res = -1;
for (int i : o)
{
if (!inq[i]) res = max(res, dp[i]);
for (int j : adj[i]) dp[j] = max(dp[j], dp[i] + 1);
}
cout << res << '\n';
}
else
{
int res = -1;
for (array<int, 2> &i : b[t])
{
if (!inq[i[1]])
{
res = i[0];
break;
}
}
cout << res << '\n';
}
for (int &i : v) inq[i] = 0;
}
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int t = 1;
// cin >> t;
for (int tt = 1; tt <= t; tt++)
{
_();
}
}
컴파일 시 표준 에러 (stderr) 메시지
bitaro.cpp: In function 'void init(int)':
bitaro.cpp:24:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
24 | while (nw.size() < B + 1 && i < b[a].size() && j < b[v].size())
| ~~^~~~~~~~~~~~~
bitaro.cpp:24:58: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
24 | while (nw.size() < B + 1 && i < b[a].size() && j < b[v].size())
| ~~^~~~~~~~~~~~~
bitaro.cpp:39:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
39 | while (nw.size() < B + 1 && i < b[a].size()) if (in[b[a][i][1]] && ++i) continue; else nw.push_back(b[a][i]), in[b[a][i++][1]] = 1;
| ~~^~~~~~~~~~~~~
bitaro.cpp:40:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
40 | while (nw.size() < B + 1 && j < b[v].size()) if (in[b[v][j][1]] && ++j) continue; else nw.push_back({b[v][j][0] + 1, b[v][j][1]}), in[b[v][j++][1]] = 1;
| ~~^~~~~~~~~~~~~
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