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Submission #17985

# Submission time Handle Problem Language Result Execution time Memory
17985 2016-01-18T06:42:08 Z comet Dancing Elephants (IOI11_elephants) C++
10 / 100
 98 ms 23216 KB 
#include <cstdio>
#include <algorithm>
using namespace std;

int N,M,L;
int B=3;

struct group{
	int sz,p[710],cnt[710],nxt[710];
	group():sz(0){}
	void init(){
		int id=sz-1;
		for(int i=sz-1;i>=0;i--){
			if(p[sz-1]-p[i]<=L)cnt[i]=1,nxt[i]=p[i]+L+1;
			else{
				while(p[id]-p[i]>L)id--;
				cnt[i]=cnt[id+1]+1;
				nxt[i]=nxt[id+1];
			}
		}
	}
	void push(int x){
		int id=0;
		while(p[id]<=x&&id<sz)id++;
		sz++;
		for(int i=sz-1;i>id;i--)p[i]=p[i-1];
		p[id]=x;
		init();
	}
	void pop(int x){
		int id=0;
		while(p[id]<=x)id++;
		for(int i=id;i<sz;i++)p[i-1]=p[i];
		sz--;
		init();
	}
}a[500];

struct elephant{
	int p,group_id,id;
	bool operator<(const elephant& r)const{
		return p<r.p;
	}
}b[150010];

int ID[150010];

void renewal(){
	sort(b,b+N);
	for(int i=0;i<M;i++)a[i].sz=0;
	for(int i=0;i<N;i++){
		ID[b[i].id]=i;
		a[i/B].p[a[i/B].sz++]=b[i].p;
		b[i].group_id=i/B;
		M=max(M,i/B+1);
	}
	for(int i=0;i<M;i++){
		a[i].init();
	}
/*
	puts("renewal");
	for(int i=0;i<N;i++)printf("%d ",ID[i]);
		puts("");
	for(int i=0;i<N;i++)printf("%d ",b[i].group_id);
		puts("");
	for(int i=0;i<M;i++){
		for(int j=0;j<a[i].sz;j++){
			printf("(%d,%d,%d) ",a[i].p[j],a[i].cnt[j],a[i].nxt[j]);
		}
		puts("");
	}
*/
}

void init(int N_, int L_, int X[]){
	N=N_;
	L=L_;
	for(int i=0;i<N;i++)b[i]=elephant{X[i],i/B,i};
	renewal();
}

int findGroup(int x){
	if(a[0].p[0]>x)return 0;
	for(int i=0;i<M;i++)
		if(a[i].p[0]<=x&&a[i].p[a[i].sz-1]>=x)
			return i;
	
	return M-1;
}

int calc(){
	int x=0,ret=0;
	for(int i=0;i<M;i++){
		int id=lower_bound(a[i].p,a[i].p+a[i].sz,x)-a[i].p;
		if(id==a[i].sz)continue;
		ret+=a[i].cnt[id];
		x=a[i].nxt[id];
	}
	return ret;
}

int update(int i, int y){
	int id=b[ID[i]].group_id;
	a[id].pop(b[ID[i]].p);
	b[ID[i]].p=y;
	int new_id=b[i].group_id=findGroup(y);
	a[new_id].push(b[ID[i]].p);
/*
	puts("update");
	for(int i=0;i<N;i++)printf("%d ",ID[i]);
		puts("");
	for(int i=0;i<N;i++)printf("%d ",b[i].group_id);
		puts("");
	for(int i=0;i<M;i++){
		for(int j=0;j<a[i].sz;j++){
			printf("(%d,%d,%d) ",a[i].p[j],a[i].cnt[j],a[i].nxt[j]);
		}
		puts("");
	}
*/
	if(a[id].sz==0||a[id].sz>700)renewal();
	if(a[new_id].sz==0||a[new_id].sz>700)renewal();


	return calc();
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 23216 KB Output is correct
2 Correct 0 ms 23216 KB Output is correct
3 Correct 0 ms 23216 KB Output is correct

Subtask #2
0.0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 23216 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 24.0

# Verdict Execution time Memory Grader output
1 Runtime error 13 ms 23212 KB SIGSEGV Segmentation fault
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 47.0

# Verdict Execution time Memory Grader output
1 Runtime error 25 ms 23212 KB SIGSEGV Segmentation fault
2 Halted 0 ms 0 KB -

Subtask #5
0.0 / 3.0

# Verdict Execution time Memory Grader output
1 Runtime error 98 ms 23212 KB SIGSEGV Segmentation fault
2 Halted 0 ms 0 KB -