Submission #707399

#	Time	Username	Problem	Language	Result	Execution time	Memory
707399		EthanKim8683	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	2085 ms	186080 KiB

bitaro

#include<bits/stdc++.h>
using namespace std;
using I=int;
const I N=100000;
const I MIN=-1e9;
vector<I>adjs[N];
map<I,I>pres[N];
vector<pair<I,I>>tops[N];
vector<I>curs;
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);
  }
  I siz=sqrt(n/log2(n));
  for(I i=0;i<n;i++){
    tops[i].push_back({0,i});
    for(auto[j,dis]:pres[i])tops[i].push_back({dis,j});
    sort(tops[i].begin(),tops[i].end());
    while(tops[i].size()>siz)tops[i].pop_back();
    for(auto j:adjs[i])for(auto[dis,k]:tops[i])pres[j][k]=min(pres[j][k],dis-1);
    pres[i].clear();
  }
  while(q--){
    I t,y;cin>>t>>y,t--;
    curs.clear();
    for(I i=0;i<y;i++){I c;cin>>c,curs.push_back(c-1);}
    sort(curs.begin(),curs.end());
    I res=MIN;
    for(auto[dis,i]:tops[t])if(!binary_search(curs.begin(),curs.end(),i)){res=-dis;break;}
    if(res!=MIN){printf("%i\n",res);continue;}
    if(curs.size()<=siz){printf("-1\n");continue;}
    fill_n(dp,t+1,0);
    for(auto c:curs)dp[c]=MIN;
    for(I i=0;i<t;i++)if(dp[i]!=MIN)for(auto j:adjs[i])if(j<=t)dp[j]=max(dp[j],dp[i]+1);
    printf("%i\n",dp[t]==MIN?-1:dp[t]);
  }
}

Compilation message (stderr)

bitaro.cpp: In function 'I main()':
bitaro.cpp:23:25: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'I' {aka 'int'} [-Wsign-compare]
   23 |     while(tops[i].size()>siz)tops[i].pop_back();
      |           ~~~~~~~~~~~~~~^~~~
bitaro.cpp:35:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'I' {aka 'int'} [-Wsign-compare]
   35 |     if(curs.size()<=siz){printf("-1\n");continue;}
      |        ~~~~~~~~~~~^~~~~

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