#include "highway.h"
#include<bits/stdc++.h>
using namespace std;
int n,m,a,b;std::vector<int>u,v;std::vector<std::pair<int,int>>g[90001];
int sub12(int src,int ban)
{
vector<int>d(n,1e9),e(n,-1);
queue<pair<int,int>>q; q.emplace(d[src]=0,src);
while(q.size()){auto[c,u]=q.front();q.pop();for(auto[v,i]:g[u])if(ban-i&&d[v]>c+1)q.emplace(d[v]=c+1,v),e[v]=i;}
long long need; {vector<int>qq(m,1);for(int i=0;i<n;++i)if(~e[i])qq[e[i]]=0;need=ask(qq);}
vector<int>c;
for(int i=0;i<n;++i)if(d[i]<1e9)c.push_back(i);
sort(c.begin(),c.end(),[&d](int i,int v){return d[i]<d[v];});
int z=0,l=0,r=c.size()-1;
while(l<=r){
int y=(l+r)/2;
vector<int>qq(m,1);
for(int i=1;i<=y;++i)if(~e[c[i]])qq[e[c[i]]]=0;
if (ask(qq)==need)z=c[y],r=y-1;
else l=y+1;
}
return z;
}
void sub1234(){
long long need; {vector<int>qq(m,1); need=ask(qq);}
auto dt = need / b;
long long light = dt * a;
int e1,l=0,r=m-1;
while(l<=r) {
int y=(l+r)/2;
vector<int>qq(m);
for(int i=0;i<=y;++i)qq[i]=1;
if(ask(qq)>light)r=y-1,e1=y;
else l=y+1;
}
int p=u[e1],q=v[e1],s=sub12(p,e1),t=sub12(q,e1);
answer(s,t);
}
void sub6()
{
return sub1234();
long long need; {vector<int>qq(m,1); need=ask(qq);}
int e1,l=0,r=m-1;
while(l<=r) {
int y=(l+r)/2;
vector<int>qq(m);
for(int i=0;i<=y;++i)qq[i]=1;
if(ask(qq)>need)r=y-1,e1=y;
else l=y+1;
}
int p=u[e1],q=v[e1],s=sub12(p,e1),t=sub12(q,e1);
answer(s,t);
}
void sub5(){
int l=0,r=n-1;
auto diffset = [&](vector<int>&grp){
vector<int>qq(m);
for(int i=0;i<m;++i)if(grp[u[i]]^grp[v[i]])qq[i]=0;else qq[i]=1;
if(ask(qq)&1)return 1;return 0;
};
vector<int> gs,gt,grp(n);
for(int b=0;b<=17;++b){
for(int i=0;i<n;++i)
grp[i]=(i>>b)&1;
if(diffset(grp)) {break;}
}
for(int i=0;i<n;++i)if(grp[i])gt.push_back(i);else gs.push_back(i);
while(gs.size()>1){
vector<int>n1,n2,test(n);
for(int i=0;i<gs.size()/2;++i)n1.push_back(gs[i]);
for(int i=gs.size()/2;i<gs.size();++i)n2.push_back(gs[i]);
for(int x:n1)test[x]=1;
if(diffset(test))gs=n1;
else gs=n2;
}
while(gt.size()>1){
vector<int>n1,n2;
for(int i=0;i<gt.size()/2;++i)n1.push_back(gt[i]);
for(int i=gt.size()/2;i<gt.size();++i)n2.push_back(gt[i]);
vector<int> test(n);for(int x:n1)test[x]=1;
if(diffset(test))gt=n1;
else gt=n2;
}
answer(gs[0],gt[0]);
}
void find_pair(int n_, std::vector<int> u_, std::vector<int> v_, int A_, int B_) {
n=n_,u=u_,v=v_,a=A_,b=B_;m=u.size();
for(int i=0;i<m;++i)g[u[i]].push_back({v[i],i}),g[v[i]].push_back({u[i],i});
sub6();
if(a==1&&b==2)return sub5();
sub1234();
}
Compilation message
highway.cpp: In lambda function:
highway.cpp:75:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
75 | if(ask(qq)&1)return 1;return 0;
| ^~
highway.cpp:75:31: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
75 | if(ask(qq)&1)return 1;return 0;
| ^~~~~~
highway.cpp: In function 'void sub5()':
highway.cpp:90:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
90 | for(int i=0;i<gs.size()/2;++i)n1.push_back(gs[i]);
| ~^~~~~~~~~~~~
highway.cpp:91:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
91 | for(int i=gs.size()/2;i<gs.size();++i)n2.push_back(gs[i]);
| ~^~~~~~~~~~
highway.cpp:99:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
99 | for(int i=0;i<gt.size()/2;++i)n1.push_back(gt[i]);
| ~^~~~~~~~~~~~
highway.cpp:100:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
100 | for(int i=gt.size()/2;i<gt.size();++i)n2.push_back(gt[i]);
| ~^~~~~~~~~~
highway.cpp:70:9: warning: unused variable 'l' [-Wunused-variable]
70 | int l=0,r=n-1;
| ^
highway.cpp:70:13: warning: unused variable 'r' [-Wunused-variable]
70 | int l=0,r=n-1;
| ^
highway.cpp: In function 'void sub1234()':
highway.cpp:45:15: warning: 'e1' may be used uninitialized in this function [-Wmaybe-uninitialized]
45 | int p=u[e1],q=v[e1],s=sub12(p,e1),t=sub12(q,e1);
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
2392 KB |
Output is incorrect: answered not exactly once. |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
2612 KB |
Output is incorrect: answered not exactly once. |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
12 ms |
3256 KB |
Output is incorrect: answered not exactly once. |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
2616 KB |
Output is incorrect: answered not exactly once. |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
16 ms |
3432 KB |
Output is incorrect: answered not exactly once. |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
18 ms |
3420 KB |
Output is incorrect: answered not exactly once. |
| 2 |
Halted |
0 ms |
0 KB |
- |
