Submission #38712

#	Time	Username	Problem	Language	Result	Execution time	Memory
38712		khohko	Divide and conquer (IZhO14_divide)	C++14	100 / 100	243 ms	10824 KiB

divide

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define fr first
#define sc second
#define N ((ll)(2e5+100))
#define MAX ((ll)(1e16+100))
#define ARRS ((ll)(2e5+100))
#define MOD ((ll)(1e9+7))
#define pb push_back

ll n;
struct va{
	ll x,g,c;
};
va a[ARRS];
ll pas=0;
void slv(ll l,ll r){
	if(l>=r)return;
	if(l==r-1){
		pas=max(a[l].g,pas);
		return;
	}
	ll m=(l+r)>>1;
	vector<pair<ll,ll> > v;
	vector<pair<ll,ll> > g;
	ll s=0,sg=0;
	for(int i=m+1; i<r; i++){
		s+=a[i].c;
		sg+=a[i].g;
		v.pb({s-(a[i].x-a[m].x),sg});
	}
	v.pb({0,0});
	s=sg=0;
	for(int i=m; i>=l; i--){
		s+=a[i].c;
		sg+=a[i].g;
		g.pb({s-(a[m].x-a[i].x),sg});
	}
	sort(v.begin(),v.end());
	sort(g.begin(),g.end());
	reverse(g.begin(),g.end());
	//cout<<m<<endl;
	//for(auto x:v){
		//cout<<x.fr<<"  "<<x.sc<<endl;
	//}
	//cout<<endl;
	//for(auto x:g){
		//cout<<x.fr<<"  "<<x.sc<<endl;
	//}
	//cout<<endl;
	ll mx=-MAX;
	ll ps=0;
	for(int i=0,j=0; i<v.size(); i++){
		while(j!=g.size()&&v[i].fr+g[j].fr>=0)mx=max(mx,g[j].sc),j++;
		//cout<<i<<" "<<j<<" "<<mx<<endl; 
		ps=max(ps,mx+v[i].sc);
	}
	pas=max(pas,ps);
	slv(l,m);
	slv(m+1,r);
	return;
}


int main(){
	//freopen("divide.in","r",stdin);
	//freopen("divide.out","w+",stdout);
	cin>>n;
	for(int i=0; i<n; i++){
		cin>>a[i].x>>a[i].g>>a[i].c;
	}
	slv(0,n);
	cout<<pas;
}

Compilation message (stderr)

divide.cpp: In function 'void slv(long long int, long long int)':
divide.cpp:55:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0,j=0; i<v.size(); i++){
                    ^
divide.cpp:56:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(j!=g.size()&&v[i].fr+g[j].fr>=0)mx=max(mx,g[j].sc),j++;
          ^

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52