Submission #99318

#	Time	Username	Problem	Language	Result	Execution time	Memory
99318		TadijaSebez	Arranging Tickets (JOI17_arranging_tickets)	C++11	0 / 100	3 ms	384 KiB

arranging_tickets

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N=200050;
const int M=2*N;
const int inf=1e9+7;
int ls[M],rs[M],tsz,root,lzy[M],mx[M];
void Add(int &c, int ss, int se, int qs, int qe, int f)
{
	if(qs>qe || qs>se || ss>qe) return;
	if(!c) c=++tsz;
	if(qs<=ss && qe>=se){ lzy[c]+=f;mx[c]+=f;return;}
	int mid=ss+se>>1;
	Add(ls[c],ss,mid,qs,qe,f);
	Add(rs[c],mid+1,se,qs,qe,f);
	mx[c]=max(mx[ls[c]],mx[rs[c]])+lzy[c];
}
int Get(int c, int ss, int se, int qs, int qe)
{
	if(qs>qe || qs>se || ss>qe) return -inf;
	if(qs<=ss && qe>=se) return mx[c];
	int mid=ss+se>>1;
	return max(Get(ls[c],ss,mid,qs,qe),Get(rs[c],mid+1,se,qs,qe))+lzy[c];
}
int a[N],b[N],c[N];
int main()
{
	int n,m,i;
	scanf("%i %i",&n,&m);
	ll ans=0;
	for(i=1;i<=m;i++)
	{
		scanf("%i %i %i",&a[i],&b[i],&c[i]);
		ans+=c[i]/2;
		if(a[i]>b[i]) swap(a[i],b[i]);
		b[i]--;
		if(c[i]&1) Add(root,1,n,a[i],b[i],1);
	}
	for(i=1;i<=m;i++) if(c[i]&1)
	{
		int pre=mx[root],nxt=max(Get(root,1,n,1,a[i]-1),Get(root,1,n,b[i]+1,n))+1;
		if(pre>nxt) Add(root,1,n,1,n,1),Add(root,1,n,a[i],b[i],-2);
	}
	ans+=mx[root];
	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

arranging_tickets.cpp: In function 'int main()':
arranging_tickets.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~
arranging_tickets.cpp:33:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i %i %i",&a[i],&b[i],&c[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 35
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 15