Submission #213124

#TimeUsernameProblemLanguageResultExecution timeMemory
213124usernameMaking Friends on Joitter is Fun (JOI20_joitter2)C++14
0 / 100
5 ms384 KiB
#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector") #include<ext/pb_ds/assoc_container.hpp> #include<ext/pb_ds/tree_policy.hpp> #include<ext/rope> using namespace __gnu_pbds; using namespace __gnu_cxx; #define tr(it,a) for(auto it:a) #define pob pop_back #define pf push_front #define pof pop_front #define umin(x,y) (x=min(x,(y))) #define umax(x,y) (x=max(x,(y))) #define mid ((l+r)/2) #define lch (idx*2+1) #define rch (idx*2+2) // #include<bits/stdc++.h> #define int int_fast64_t using namespace std; typedef pair<int,int> pii; #define REP(i,j,k) for(int i=(j);i<(k);++i) #define RREP(i,j,k) for(int i=int(j)-1;i>=(k);--i) #define ALL(a) a.begin(),a.end() #define pb push_back #define f first #define s second #define endl '\n' // #define __db #ifdef __db #define IOS #define prt(...) cerr<<__VA_ARGS__ #define ary(s,t)\ for(auto it=(s);it!=(t);++it)prt(*it<<" ");\ prt(endl); #else #define IOS cin.tie(0),cout.tie(0),ios_base::sync_with_stdio(false) #define prt(...) #define ary(...) #endif // const int maxn=1e5+9,maxm=3e5+9; int n,m,res=0,fa[maxn],sz[maxn]; set<pii>*ex[maxn],*re[maxn]; int find(int x){ return x==fa[x]?x:fa[x]=find(fa[x]); } main(){ IOS; cin>>n>>m; REP(i,0,n)fa[i]=i,sz[i]=1,ex[i]=new set<pii>,re[i]=new set<pii>; while(m--){ int a,b,pa,pb;cin>>a>>b,--a,--b,pa=find(a),pb=find(b); if(pa==pb||ex[pa]->count({pb,a})){ cout<<res<<endl; continue; } ex[pa]->insert({pb,a}); re[pb]->insert({pa,a}); res+=sz[pb]; auto it=ex[pb]->lower_bound({pa,0}); if(it!=ex[pb]->end()&&it->f==pa){ res-=sz[pa]*re[pa]->size(); res-=sz[pb]*re[pb]->size(); while(1){ it=ex[pa]->lower_bound({pb,0}); if(it!=ex[pa]->end()&&it->f==pb)ex[pa]->erase(it); else break; } while(1){ it=re[pa]->lower_bound({pb,0}); if(it!=re[pa]->end()&&it->f==pb)re[pa]->erase(it); else break; } while(1){ it=ex[pb]->lower_bound({pa,0}); if(it!=ex[pb]->end()&&it->f==pa)ex[pb]->erase(it); else break; } while(1){ it=re[pb]->lower_bound({pa,0}); if(it!=re[pb]->end()&&it->f==pa)re[pb]->erase(it); else break; } if(ex[pa]->size()+re[pa]->size()>ex[pb]->size()+re[pb]->size())swap(a,b),swap(pa,pb); tr(x,*ex[pa]){ re[x.f]->erase({pa,x.s}); re[x.f]->insert({pb,x.s}); } tr(x,*re[pa]){ ex[x.f]->erase({pa,x.s}); ex[x.f]->insert({pb,x.s}); } tr(x,*ex[pa])ex[pb]->insert(x); tr(x,*re[pa])re[pb]->insert(x); res+=2*sz[pa]*sz[pb]; res+=(sz[pa]+sz[pb])*re[pb]->size(); fa[pa]=pb,sz[pb]+=sz[pa]; } // REP(i,0,n){ // cout<<i+1<<"->"<<find(i)+1<<endl; // } // REP(i,0,n){ // if(i==find(i)){ // cout<<i+1<<":"; // tr(it,*ex[i])cout<<it.f+1<<","<<it.s+1<<" ";cout<<endl; // tr(it,*re[i])cout<<it.f+1<<","<<it.s+1<<" ";cout<<endl; // } // } // cout<<endl; cout<<res<<endl; } }

Compilation message (stderr)

joitter2.cpp:49:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
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