#include <bits/stdc++.h>
#include "garden.h"
#include "gardenlib.h"
//#include "grader.cpp"
using namespace std ;
const int MAX = 2 * 150010 ;
int mark[MAX] , par[MAX] , vis[MAX] , to[MAX] , best[MAX] , best2[MAX] , dist[MAX][2] , cycleid[MAX] , cycle_sz[MAX] , edge[MAX][2] ;
vector< vector<int> >rev_adj(MAX) ;
int n , m ;
void Addedge(int x , int y , int val)
{
if(best[x] == val)
{
if(best[y] == val)
to[x] = y+n ;
else
to[x] = y ;
}
else if(best2[x] == val)
{
if(best[y] == val)
to[x+n] = y+n ;
else
to[x+n] = y ;
}
}
void ConstructGraph()
{
for(int i = 0 ; i < m ; ++i)
{
int x = edge[i][0] ;
int y = edge[i][1] ;
int val = i+1 ;
++x , ++y ;
if(!best[x])
best[x] = val ;
else if(!best2[x])
best2[x] = val ;
if(!best[y])
best[y] = val ;
else if(!best2[y])
best2[y] = val ;
Addedge(x , y , val) ;
Addedge(y , x , val) ;
}
}
void bfs(int src , bool t)
{
for(int i = 1 ; i <= n+n ; ++i)
dist[i][t] = -1 ;
dist[src][t] = 0 ;
queue<int>q ;
q.push(src) ;
while(!q.empty())
{
int node = q.front() ;
q.pop() ;
for(auto &child : rev_adj[node])
{
if(dist[child][t] == -1)
{
dist[child][t] = dist[node][t] + 1 ;
q.push(child) ;
}
}
}
}
int id = 0 ;
vector<int>v ;
void dfs(int node)
{
vis[node] = 1 ;
if(to[node])
{
if(mark[to[node]])
{
v.clear() ;
++id ;
int a = to[node] ;
while(node != a)
{
v.push_back(node) ;
node = par[node] ;
}
v.push_back(node) ;
for(auto &i : v)
cycleid[i] = id ;
cycle_sz[id] = v.size() ;
return ;
}
mark[node] = 1 ;
if(!vis[to[node]])
{
par[to[node]] = node ;
dfs(to[node]) ;
}
}
mark[node] = 0 ;
}
void find_cycle()
{
for(int i = 1 ; i <= n+n ; ++i)
{
if(vis[i])
continue ;
dfs(i) ;
}
}
void count_routes(int N, int M, int P, int R[][2], int Q, int G[])
{
for(int i = 0 ; i < M ; ++i)
edge[i][0] = R[i][0] , edge[i][1] = R[i][1] ;
P++ ;
n = N , m = M ;
ConstructGraph() ;
for(int i = 1 ; i <= n+n ; ++i)
{
if(to[to[i]] == 0 && to[i] > 0)
to[i] = to[i] - n ;
}
for(int i = 1 ; i <= n+n ; ++i)
rev_adj[to[i]].push_back(i) ;
bfs(P , 0) ;
bfs(P+n , 1) ;
find_cycle() ;
for(int i = 0 ; i < Q ; ++i)
{
int x = G[i] ;
int ans = 0 ;
for(int j = 1 ; j <= n ; ++j)
{
bool flag = false ;
if(dist[j][0] != -1)
{
if(dist[j][0] == x)
flag = true ;
if(cycleid[j] > 0 && cycleid[j] == cycleid[P] && dist[j][0] == x % cycle_sz[cycleid[j]])
flag = true ;
}
if(dist[j][1] != -1)
{
if(dist[j][1] == x)
flag = true ;
if(cycleid[j] > 0 && cycleid[j] == cycleid[P+n] && dist[j][1] == x % cycle_sz[cycleid[j]])
flag = true ;
}
ans += flag ;
}
answer(ans) ;
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
9 ms |
7424 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
9 ms |
7424 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
9 ms |
7424 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
