Submission #707377

#	Time	Username	Problem	Language	Result	Execution time	Memory
707377		EthanKim8683	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	1701 ms	524288 KiB

bitaro

#include<bits/stdc++.h>
using namespace std;
using I=int;
const I N=100000;
const I Q=100000;
const I MIN=-1e9;
vector<I>adjs[N];
set<I>bsys[Q];
vector<I>inds[N];
set<pair<I,I>>tops[N];
I ress[Q];
I dp[N];
I main(){
  cin.tie(0)->sync_with_stdio(0);
  I n,m,q;cin>>n>>m>>q;
  for(I i=0;i<m;i++){
    I s,e;cin>>s>>e,s--,e--;
    adjs[s].push_back(e);
  }
  fill_n(ress,q,MIN);
  for(I i=0;i<q;i++){
    I t,y;cin>>t>>y,t--;
    inds[t].push_back(i);
    for(I j=0;j<y;j++){
      I c;cin>>c,c--;
      bsys[i].insert(c);
    }
  }
  I siz=sqrt(n);
  for(I i=0;i<n;i++)tops[i].insert({0,i});
  for(I i=0;i<n;i++){
    for(auto j:inds[i]){
      for(auto[dis,k]:tops[i])if(!bsys[j].count(k)){ress[j]=-dis;break;}
      if(ress[j]!=MIN)continue;
      if(bsys[j].size()<=siz)continue;
      fill_n(dp,i+1,0);
      for(auto c:bsys[j])dp[c]=MIN;
      for(I k=0;k<i;k++)if(dp[k]!=MIN)for(auto l:adjs[k])if(l<=i)dp[l]=max(dp[l],dp[k]+1);
      ress[j]=dp[i];
    }
    for(auto j:adjs[i])for(auto[dis,k]:tops[i]){
      tops[j].insert({dis-1,k});
      while(tops[j].size()>siz)tops[j].erase(prev(tops[j].end()));
    }
  }
  for(I i=0;i<q;i++)printf("%i\n",ress[i]==MIN?-1:ress[i]);
}

Compilation message (stderr)

bitaro.cpp: In function 'I main()':
bitaro.cpp:35:24: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'I' {aka 'int'} [-Wsign-compare]
   35 |       if(bsys[j].size()<=siz)continue;
      |          ~~~~~~~~~~~~~~^~~~~
bitaro.cpp:43:27: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'I' {aka 'int'} [-Wsign-compare]
   43 |       while(tops[j].size()>siz)tops[j].erase(prev(tops[j].end()));
      |             ~~~~~~~~~~~~~~^~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86