#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
const int MOD = 998244353;
const int maxN = 150000;
pair<int, int> oradj[maxN];
vector<int> adj;
vector<vector<int>> radj;
pair<int, int> ind[maxN]; //First, can take the best, second can't take it.
int rel[2 * maxN];
int dist1[2 * maxN];
int dist2[2 * maxN];
int sz, first, important;
//~ void answer(int x);
bool find_cycle(int x, vector<bool>& vis, vector<bool>& stck){
if(x == -1) return 0;
vis[x] = 1;
stck[x] = 1;
if(stck[adj[x]]){
first = adj[x];
sz = 1;
return 1;
}
if(!vis[adj[x]]){
bool cyc = find_cycle(adj[x], vis, stck);
if(cyc){
sz++;
if(first == x) return 0;
else return 1;
}
}
stck[x] = 0;
if(x == important) sz = -1;
return 0;
}
void DFS(int x, vector<bool>& vis, int type, int dist){
if(x == -1) return;
//~ cout << "X " << x << " dist " << dist << endl;
if(type == 1) dist1[x] = dist;
else dist2[x] = dist;
vis[x] = 1;
for(int node : radj[x]){
if(!vis[node]) DFS(node, vis, type, dist + 1);
}
}
void count_routes(int N, int M, int P, int R[][2], int Q, int G[]){
for(int i = 0; i < N; i++) oradj[i] = {-1, -1};
for(int i = 0; i < M; i++){
int u = R[i][0]; int v = R[i][1];
if(oradj[u].first == -1) oradj[u].first = v;
else if(oradj[u].second == -1) oradj[u].second = v;
if(oradj[v].first == -1) oradj[v].first = u;
else if(oradj[v].second == -1) oradj[v].second = u;
}
int curr = 0;
for(int i = 0; i < N; i++){
if(oradj[i].second != -1){
ind[i] = {curr, curr + 1};
rel[curr] = i; rel[curr + 1] = i;
curr += 2;
}else{
ind[i] = {curr, -1};
rel[curr] = i;
curr++;
}
}
adj.resize(curr); radj.resize(curr);
for(int i = 0; i < curr; i++){
int node = rel[i];
if(ind[node].first == i){
int go;
if(oradj[oradj[node].first].first == node){
if(oradj[oradj[node].first].second == -1) go = ind[oradj[node].first].first;
else go = ind[oradj[node].first].second;
}else{
go = ind[oradj[node].first].first;
}
adj[i] = go;
radj[go].push_back(i);
}else{
int go;
if(oradj[oradj[node].second].first == node){
if(oradj[oradj[node].second].second == -1) go = ind[oradj[node].second].first;
else go = ind[oradj[node].second].second;
}else{
go = ind[oradj[node].second].first;
}
adj[i] = go;
radj[go].push_back(i);
}
}
//~ for(int i = 0; i < N; i++){
//~ cout << "I " << i << " ind " << ind[i].first << " " << ind[i].second << endl;
//~ }
//~ for(int i = 0; i < curr; i++){
//~ cout << "I " <<i << " adj " << adj[i] << endl;
//~ }
pair<int, int> cycles;
vector<bool> vis(curr, 0);
vector<bool> stck(curr, 0);
sz = -1;
important = ind[P].first;
find_cycle(ind[P].first, vis, stck);
cycles.first = sz;
vis.assign(curr, 0); stck.assign(curr, 0);
sz = -1;
important = ind[P].second;
find_cycle(ind[P].second, vis, stck);
cycles.second = sz;
vis.assign(curr, 0);
for(int i = 0; i < curr; i++){
dist1[i] = -1;
dist2[i] = -1;
}
DFS(ind[P].first, vis, 1, 0);
vis.assign(curr, 0);
DFS(ind[P].second, vis, 2, 0);
//~ cout << "cycles " << cycles.first << " " << cycles.second << endl;
//~ cout << "Dist1" << endl;
//~ for(int i = 0; i < curr; i++){
//~ cout << "I " << i << " " << dist1[i] << endl;
//~ }
//~ cout << "Dist2" << endl;
//~ for(int i = 0; i < curr; i++){
//~ cout << "I " << i << " " << dist2[i] << endl;
//~ }
for(int q = 0; q < Q; q++){
int k = G[q];
int ans = 0;
for(int i = 0; i < N; i++){
int id = ind[i].first;
if(dist1[id] != -1 && dist1[id] <= k){
int left = k - dist1[id];
if(left == 0 || (cycles.first != -1 && left % cycles.first == 0)) ans++;
}
if(dist2[id] != -1 && dist2[id] <= k){
int left = k - dist2[id];
if(left == 0 || (cycles.second != -1 && left % cycles.second == 0)) ans++;
}
}
//~ cout << "q " << q << " ans " << ans << " k " << k << endl;
answer(ans);
}
}
//~ #define MAX_M 1000000
//~ #define MAX_Q 2000
//~ static int N, M, P, Q;
//~ static int R[MAX_M][2];
//~ static int G[MAX_Q];
//~ static int solutions[MAX_Q];
//~ static int answers[MAX_Q];
//~ static int answer_count;
//~ inline
//~ void my_assert(int e) {if (!e) abort();}
//~ void read_input()
//~ {
//~ int i;
//~ my_assert(3==scanf("%d %d %d",&N,&M,&P));
//~ for(i=0; i<M; i++)
//~ my_assert(2==scanf("%d %d",&R[i][0],&R[i][1]));
//~ my_assert(1==scanf("%d",&Q));
//~ for(i=0; i<Q; i++)
//~ my_assert(1==scanf("%d",&G[i]));
//~ for(i=0; i<Q; i++)
//~ my_assert(1==scanf("%d",&solutions[i]));
//~ }
//~ void answer(int x)
//~ {
//~ if(answer_count>=Q) {
//~ printf("Incorrect. Too many answers.\n");
//~ exit(0);
//~ }
//~ answers[answer_count] = x;
//~ answer_count++;
//~ }
//~ int main()
//~ {
//~ int correct, i;
//~ read_input();
//~ answer_count = 0;
//~ count_routes(N,M,P,R,Q,G);
//~ if(answer_count!=Q) {
//~ printf("Incorrect. Too few answers.\n");
//~ exit(0);
//~ }
//~ correct = 1;
//~ for(i=0; i<Q; i++)
//~ if(answers[i]!=solutions[i])
//~ correct = 0;
//~ if(correct)
//~ printf("Correct.\n");
//~ else {
//~ printf("Incorrect.\n");
//~ printf("Expected: ");
//~ for(i=0; i<Q; i++)
//~ printf("%d ",solutions[i]);
//~ printf("\nReturned: ");
//~ for(i=0; i<Q; i++)
//~ printf("%d ",answers[i]);
//~ }
//~ return 0;
//~ }
Compilation message
garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:151:3: error: 'answer' was not declared in this scope
151 | answer(ans);
| ^~~~~~
