Submission #14696

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
146962015-06-05 04:51:52minsuTropical Garden (IOI11_garden)C++14
100 / 100
2313 ms15644 KiB
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <queue>
#include "garden.h"
#include "gardenlib.h"
using namespace std;
const int MAXN=1e6;
int elast[MAXN], eprev[MAXN], eadj[MAXN], eind;
int bpath[MAXN][2], bpathn[MAXN];
int L[MAXN], C[MAXN];
void add_edge(int u, int v){
eadj[eind]=v; eprev[eind]=elast[u]; elast[u]=eind++;
}
void count_routes(int N, int M, int P, int R[][2], int Q, int G[])
{
for(int i=0;i<M;i++){
int u=R[i][0], v=R[i][1];
if(bpathn[u]<2) bpath[u][bpathn[u]++]=v;
if(bpathn[v]<2) bpath[v][bpathn[v]++]=u;
}
for(int i=0;i<N;i++) if(bpathn[i]==1) bpath[i][1]=bpath[i][0], bpathn[i]++;
memset( elast, -1, sizeof elast );
// Vertex 0 to 2*N-1
for(int u=0;u<N;u++){
if(bpathn[u]==0) continue;
int F=bpath[u][0], S=bpath[u][1];
if(bpath[F][0]!=u) add_edge(F*2, u*2); else add_edge(F*2+1, u*2);
if(bpath[S][0]!=u) add_edge(S*2, u*2+1); else add_edge(S*2+1, u*2+1);
}
 
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