This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int bsize = 1000;
struct eveniment
{
int tip,poz,val;
};
int n,m,q;
pair<int,int> e[100005];
int c[100005];
int new_c[100005];
bool ch[100005];
int rez[100005];
int t[100005];
int rang[100005];
stack<pair<int,int>> st;
int reprezentant(int nod)
{
if(nod==t[nod])
{
return nod;
}
return reprezentant(t[nod]);
}
void uneste(int x, int y)
{
x = reprezentant(x);
y = reprezentant(y);
st.push({x,y});
if(x==y)
{
return;
}
if(rang[x] > rang[y])
{
t[y] = x;
rang[x] += rang[y];
}
else
{
t[x] = y;
rang[y] += rang[x];
}
}
void remove_last()
{
int x = st.top().first;
int y = st.top().second;
st.pop();
if(x==y)
{
return;
}
if(x==t[y])
{
t[y] = y;
rang[x] -= rang[y];
}
else
{
t[x] = x;
rang[y] -= rang[x];
}
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cin>>n>>m;
for(int i=1;i<=m;i++)
{
int x,y;
cin>>x>>y>>c[i];
e[i] = {x,y};
}
for(int i=1;i<=n;i++)
{
t[i] = i;
rang[i] = 1;
}
cin>>q;
vector<eveniment> eves;
eves.push_back(eveniment{0,0,0});
for(int i=1;i<=q;i++)
{
eveniment x;
cin>>x.tip>>x.poz>>x.val;
eves.push_back(x);
}
for(int l=1;l<=q;l+=bsize)
{
int r = min(q,l + bsize - 1);
vector<pair<pair<int,int>,int>> queries;
vector<pair<pair<int,int>,int>> sp_upd;
vector<pair<int,pair<int,int>>> upd;
for(int i=l;i<=r;i++)
{
if(eves[i].tip==2)
{
queries.push_back({{eves[i].val,eves[i].poz},i});
}
else
{
ch[eves[i].poz] = true;
sp_upd.push_back({{eves[i].poz, eves[i].val},i});
}
}
for(int i=1;i<=m;i++)
{
if(!ch[i])
{
upd.push_back({c[i],{e[i].first,e[i].second}});
}
ch[i] = false;
}
sort(upd.begin(),upd.end(),greater<pair<int,pair<int,int>>>());
sort(queries.begin(),queries.end(),greater<pair<pair<int,int>,int>>());
int poz = 0;
for(auto it : queries)
{
while(poz<upd.size() && upd[poz].first >= it.first.first)
{
uneste(upd[poz].second.first,upd[poz].second.second);
++poz;
}
int cnt = 0;
for(auto edge : sp_upd)
{
if(edge.second <= it.second)
{
new_c[edge.first.first] = edge.first.second;
}
}
for(auto edge : sp_upd)
{
if(new_c[edge.first.first]==0)
{
if(c[edge.first.first] >= it.first.first)
{
uneste(e[edge.first.first].first,e[edge.first.first].second);
++cnt;
}
continue;
}
if(new_c[edge.first.first] >= it.first.first)
{
uneste(e[edge.first.first].first,e[edge.first.first].second);
++cnt;
}
}
for(auto edge : sp_upd)
{
new_c[edge.first.first] = 0;
}
rez[it.second] = rang[reprezentant(it.first.second)];
while(cnt)
{
remove_last();
--cnt;
}
}
while(!st.empty())
{
remove_last();
}
for(int i=l;i<=r;i++)
{
if(eves[i].tip==1)
{
c[eves[i].poz] = eves[i].val;
}
}
}
for(int i=1;i<=q;i++)
{
if(eves[i].tip==2)
{
cout<<rez[i]<<'\n';
}
}
return 0;
}
Compilation message (stderr)
bridges.cpp: In function 'int main()':
bridges.cpp:134:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
134 | while(poz<upd.size() && upd[poz].first >= it.first.first)
| ~~~^~~~~~~~~~~
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