#include "bulb.h"
using namespace std;
int N, dlr[303030][2], dcn, par[303030], sw[303030], qsc, cha, ch[2], valid=-1, lose[303030];
vector<int> L, R;
int lca(int a, int b){
if(a==-1) return b;
if(a==-2) return a;
while(a>=0){
if(dlr[a][0] <= dlr[b][0] && dlr[b][0] <= dlr[a][1]) break;
a=par[a];
}
return a;
}
void pre(int ix){
if(ix<0) return;
dlr[ix][0]=dcn++;
pre(L[ix]), pre(R[ix]);
dlr[ix][1]=dcn-1;
}
void dfs(int pv, int ix){
if(ix==-1) return;
if(ix==-2){
if(cha==0) valid=-2;
if(cha==1 && qsc) valid=lca(valid,pv), lose[ch[0]]=1;
if(cha==2) lose[ch[0]]=lose[ch[1]]=1;
return;
}
par[ix]=pv;
sw[ix]=0, qsc--;
dfs(ix, L[ix]);
if(cha<2) ch[cha]=ix;
sw[ix]=1, cha++;
dfs(ix, R[ix]);
sw[ix]=2, cha--, qsc++;
}
int FindWinner(int N_, int T, std::vector<int> L_, std::vector<int> R_){
N=N_, L=L_, R=R_;
for(int i=0; i<N; i++) sw[i]=2; qsc=N;
pre(0);
dfs(-1, 0);
if(valid==-2) return 0;
if(valid==-1){
for(int i=0; i<N; i++){
if(!lose[i]) return 1;
}
return 0;
}
for(int i=valid; i>=0; i=par[i]){
if(!lose[i]) return 1;
}
return 0;
}
Compilation message
bulb.cpp: In function 'int FindWinner(int, int, std::vector<int>, std::vector<int>)':
bulb.cpp:43:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
for(int i=0; i<N; i++) sw[i]=2; qsc=N;
^~~
bulb.cpp:43:34: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
for(int i=0; i<N; i++) sw[i]=2; qsc=N;
^~~
/tmp/cclif1wp.o: In function `main':
grader.cpp:(.text.startup+0x159): undefined reference to `FindWinner(int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status
