#include<bits/stdc++.h>
using namespace std;
#define inf 0x3f3f3f3f
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#define sz(x) int((x).size())
#define fi first
#define se second
typedef long long ll;
typedef pair<int, int> ii;
template<class X, class Y>
inline bool maximize(X &x, const Y &y) {return (x < y ? x = y, 1 : 0);}
template<class X, class Y>
inline bool minimize(X &x, const Y &y) {return (x > y ? x = y, 1 : 0);}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Random(int l, int r) {
return uniform_int_distribution<int>(l, r)(rng);
}
const int MAXN = 150005;
struct Edge {
int u, v;
} edge[MAXN];
vector<ii> adj[MAXN];
vector<int> comp[MAXN];
int firstToLoop[2 * MAXN], firstInLoop[2 * MAXN], loopOf[2 * MAXN], posInComp[2 * MAXN];
int deg[2 * MAXN], pa[2 * MAXN], P[2 * MAXN][19], idc[MAXN], idn[MAXN], numNode, numEdge, numQuery, lastNode;
bool dx[MAXN];
inline int getLeftNode(int id) {
return (id >= numEdge) ? edge[id - numEdge].v : edge[id].u;
}
int getLCA(int u, int k) {
for (int i1 = k; i1 > 0; i1 ^= i1 & -i1) {
int i = __builtin_ctz(i1 & -i1);
u = P[u][i];
}
return u;
}
void count_routes(int _N, int _M, int _P, int _R[][2], int _Q, int _G[]) {
numNode = _N, numEdge = _M, lastNode = _P, numQuery = _Q;
for (int i = 0; i < _M; ++i) {
int u(_R[i][0]), v(_R[i][1]);
edge[i] = {u, v};
adj[u].push_back({v, i});
adj[v].push_back({u, i});
}
for (int u = 0; u < numNode; ++u) {
int id0 = adj[u][0].se;
int id1 = (adj[u].size() > 1 ? adj[u][1].se : 1e9+7);
bool type0 = (u == edge[adj[u][0].se].v);
bool type1 = (adj[u].size() > 1 && (u == edge[adj[u][1].se].v));
for (int it = 0; it < int(adj[u].size()); ++it) {
int v(adj[u][it].fi), id(adj[u][it].se);
bool type = !(u == edge[id].v);
if(it == 0)
idn[u] = id + !type * numEdge;
pa[id + type * numEdge] = (id != id0 || id1 >= 1e9+7) ? id0 + type0 * numEdge : id1 + type1 * numEdge;
++deg[pa[id + type * numEdge]];
P[id + type * numEdge][0] = pa[id + type * numEdge];
//cout << id + type * numEdge << ' ' << pa[id + type * numEdge] << '\n';
}
}
for (int j = 1; j < 19; ++j) {
for (int i = 0; i < 2 * numEdge; ++i) {
P[i][j] = P[P[i][j - 1]][j - 1];
}
}
int numComp(0);
for (int id = 0; id < 2 * numEdge; ++id) {
if(deg[id] || dx[id])
continue;
vector<int> tmpn;
int tmp(id);
while(!dx[tmp]) {
dx[tmp] = 1;
tmpn.push_back(tmp);
tmp = pa[tmp];
}
int szn(tmpn.size());
//cout << szn << '\n';
for (int it = 0; it <= szn; ++it) {
if(it == szn || tmpn[it] == tmp) {
if(it < szn) {
//cout << "LOOP COMP: ";
for (int jt = it; jt < szn; ++jt) {
posInComp[tmpn[jt]] = jt - it;
comp[numComp].push_back(tmpn[jt]);
firstInLoop[tmpn[jt]] = tmpn[jt];
loopOf[tmpn[jt]] = szn - it;
firstToLoop[tmpn[jt]] = 0;
idc[tmpn[jt]] = numComp;
//cout << tmpn[jt] << " \n"[jt + 1 == szn];
}
++numComp;
}
if(it > 0) {
//cout << "COMP TO " << firstInLoop[tmp] << ": ";
for (int jt = 0; jt < it; ++jt) {
posInComp[tmpn[jt]] = jt;
comp[numComp].push_back(tmpn[jt]);
firstToLoop[tmpn[jt]] = it - jt + firstToLoop[tmp];
firstInLoop[tmpn[jt]] = firstInLoop[tmp];
idc[tmpn[jt]] = numComp;
//cout << tmpn[jt] << " \n"[jt + 1 == it];
}
//cout << '\n';
++numComp;
}
break;
}
}
}
for (int id = 0; id < 2 * numEdge; ++id) {
if(!deg[id] || dx[id])
continue;
int tmp(id);
while(!dx[tmp]) {
dx[tmp] = 1;
posInComp[tmp] = comp[numComp].size();
comp[numComp].push_back(tmp);
idc[tmp] = numComp;
firstToLoop[tmp] = 0;
firstInLoop[tmp] = tmp;
tmp = pa[tmp];
}
int szn(comp[numComp].size());
for (int it = 0; it < szn; ++it)
loopOf[comp[numComp][it]] = szn;
/*cout << "LOOP COMP: ";
for (int it = 0; it < szn; ++it)
cout << comp[numComp][it] << " \n"[it + 1 == szn];*/
++numComp;
}
for (int t = 0; t < numQuery; ++t) {
int K(_G[t]), cnt(0);
//cout << K << ": ";
for (int u = 0; u < numNode; ++u) {
int id(idn[u]);
if(K < firstToLoop[id]) {
cnt += (getLeftNode(getLCA(id, K)) == lastNode);
continue;
}
int kNow(K - firstToLoop[id]);
id = firstInLoop[id];
//cout << '.' << id << '\n';
//continue;
cnt += (getLeftNode(comp[idc[id]][(posInComp[id] + kNow) % loopOf[id]]) == lastNode);
}
answer(cnt);
}
}
Compilation message
garden.cpp:6: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
6 | #pragma GCC optimization ("O3")
|
garden.cpp:7: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
7 | #pragma GCC optimization ("unroll-loops")
|
garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:65:17: warning: unused variable 'v' [-Wunused-variable]
65 | int v(adj[u][it].fi), id(adj[u][it].se);
| ^
garden.cpp:179:9: error: 'answer' was not declared in this scope
179 | answer(cnt);
| ^~~~~~
