Submission #1104756

#TimeUsernameProblemLanguageResultExecution timeMemory
1104756sweedTropical Garden (IOI11_garden)C++14
49 / 100
130 ms262144 KiB
#include "garden.h" #include "gardenlib.h" #define pb emplace_back #include<bits/stdc++.h> using namespace std; int up[300005][1000]; vector<int>g[300005]; vector<int>g2[600005]; int jp=0; int g_rev[600005]; void setup(int n) { jp=log2(100000)+1; for(int i=0;i<2*n;i++) { if(!g2[i].empty()) up[i][0]=g2[i][0]; else up[i][0] = i; } for(int i=1;i<jp;i++) { for(int j=0;j<2*n;j++) { up[j][i] = up[up[j][i-1]][i-1]; } } } int jump(int u,int x) { for(int i=jp-1;i>=0;i--) { if((x&(1<<i))==1<<i) { u=up[u][i]; } } return u; } void count_routes(int n, int m, int p, int R[][2], int Q, int G[]) { for(int i=0;i<m;i++) { if(g[R[i][0]].size()<=2) g[R[i][0]].pb(R[i][1]); if(g[R[i][1]].size()<=2) g[R[i][1]].pb(R[i][0]); } for(int i=0;i<n;i++) { int v = g[i][0]; if(i==g[v][0] and g[v].size()!=1) g2[i].pb(v+n); else g2[i].pb(v); int vv; if(g[i].size()!=1) vv = g[i][1]; else vv = g[i][0]; if(i==g[vv][0]) g2[i+n].pb(vv+n); else g2[i+n].pb(vv); } setup(n); for(int k=0;k<Q;k++) { int d = G[k]; int ans=0; for(int i=0;i<n;i++) { int u=i; u = jump(u,d); // for(int j=0;j<d;j++) // { // u = g2[u][0]; // } if(u==p or u==p+n) ans++; } answer(ans); } // for(int i=0; i<Q; i++) // answer(n); }
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