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>
#define fi first
#define se second
using namespace std;
const int N=1e5;
vector<pair<int,int>> ev;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n,k,x;
cin>>n>>k>>x;
for(int i=1;i<=n;i++)
{
int l,r,t;
cin>>l>>t>>r;
if(l+t<=r)
{
ev.emplace_back(l+t,0);
ev.emplace_back(r+1,1);
}
ev.emplace_back(l,2);
ev.emplace_back(r+1,3);
}
sort(ev.begin(),ev.end());
int l=-x,r=0;
int cntl=0,cntr=0;
int opl=0,opr=0;
long long ans=0,tmp=0;
for(int i=0,j=0;i<ev.size();)
{
if(j>=ev.size() || ev[i].fi-l<ev[j].fi-r)
{
long long d=ev[i].fi-l;
if(opr>=k)
tmp+=d*cntr;
if(opl>=k)
tmp-=d*cntl;
l+=d;
r+=d;
if(ev[i].se==0)
cntl++;
else if(ev[i].se==1)
cntl--;
else if(ev[i].se==2)
opl++;
else
opl--;
i++;
}
else
{
long long d=ev[j].fi-r;
if(opr>=k)
tmp+=d*cntr;
if(opl>=k)
tmp-=d*cntl;
l+=d;
r+=d;
if(ev[j].se==0)
cntr++;
else if(ev[j].se==1)
cntr--;
else if(ev[j].se==2)
opr++;
else
opr--;
j++;
}
//cerr<<l<<" "<<r<<" "<<tmp<<"\n";
ans=max(ans,tmp);
}
cout<<ans<<"\n";
return 0;
}
Compilation message (stderr)
autobahn.cpp: In function 'int main()':
autobahn.cpp:31:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
31 | for(int i=0,j=0;i<ev.size();)
| ~^~~~~~~~~~
autobahn.cpp:33:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
33 | if(j>=ev.size() || ev[i].fi-l<ev[j].fi-r)
| ~^~~~~~~~~~~
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