Submission #1574480


Source Code Expand

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#define ll long long
using namespace std;

const int mod=1000000007;
const int N=100005;

int n,k,l,r,ans;
ll x,y;
int dp1[N],dp2[N],f[2][N],p1[N],p2[N];
ll a[N];

void add(bool b,int x,int y){
	for (;x<=n+5;x+=x&-x){
		f[b][x]+=y;
		(f[b][x]>=mod)?f[b][x]-=mod:0;
	}
}

int query(bool b,int x){
	int s=0;
	for (;x;x-=x&-x){
		s+=f[b][x];
		(s>=mod)?s-=mod:0;
	}
	return s;
}

int ask(bool b,int x,int y){
	int s;
	if (x>y) return 0;
	s=(query(b,y)-query(b,x-1)+mod)%mod;
	return s;
}

int main(){
	scanf("%d%lld%lld",&n,&x,&y);
	if (x>y) swap(x,y);
	for (int i=1;i<=n;i++) scanf("%lld",&a[i]);
	l=r=n;
	for (int i=n;i>=1;i--){
		if (a[i+1]-a[i]<x) l=i;
		if (a[i+1]-a[i]<y) r=i;
		p1[i]=l;
		p2[i]=r;
	}
	for (int i=n;i>1;i--){
		if (p2[i]==n) dp1[i]=1;
		if (p1[i]==n) dp2[i]=1;
		
		l=lower_bound(a+1,a+1+n,a[i-1]+x)-a; l=max(l,i+1);
		r=p2[i]+1;
		dp1[i]+=ask(1,l,r);
		(dp1[i]>=mod)?dp1[i]-=mod:0;
		
		l=lower_bound(a+1,a+1+n,a[i-1]+y)-a; l=max(l,i+1);
		r=p1[i]+1;
		dp2[i]+=ask(0,l,r);
		(dp2[i]>=mod)?dp2[i]-=mod:0;
		
		add(0,i,dp1[i]);
		add(1,i,dp2[i]);
		if (p1[1]>=i-1) ans+=dp1[i];
		(ans>=mod)?ans-=mod:0;
		if (p2[1]>=i-1) ans+=dp2[i];
		(ans>=mod)?ans-=mod:0;
	}
	if (p1[1]==n) ans++;
	if (p2[1]==n) ans++;
	ans%=mod;
	printf("%d\n",ans);
	return 0;
}

Submission Info

Submission Time
Task C - Division into Two
User vjudge3
Language C++14 (GCC 5.4.1)
Score 1100
Code Size 1377 Byte
Status AC
Exec Time 44 ms
Memory 3328 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:42:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%lld%lld",&n,&x,&y);
                              ^
./Main.cpp:44:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for (int i=1;i<=n;i++) scanf("%lld",&a[i]);
                                            ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 1100 / 1100
Status
AC × 4
AC × 68
Set Name Test Cases
Sample s1.txt, s2.txt, s3.txt, s4.txt
All 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 35.txt, 36.txt, 37.txt, 38.txt, 39.txt, 40.txt, 41.txt, 42.txt, 43.txt, 44.txt, 45.txt, 46.txt, 47.txt, 48.txt, 49.txt, 50.txt, 51.txt, 52.txt, 53.txt, 54.txt, 55.txt, 56.txt, 57.txt, 58.txt, 59.txt, 60.txt, 61.txt, 62.txt, 63.txt, 64.txt, s1.txt, s2.txt, s3.txt, s4.txt
Case Name Status Exec Time Memory
01.txt AC 43 ms 3328 KB
02.txt AC 42 ms 3328 KB
03.txt AC 42 ms 3328 KB
04.txt AC 41 ms 3328 KB
05.txt AC 42 ms 3328 KB
06.txt AC 39 ms 3328 KB
07.txt AC 43 ms 3328 KB
08.txt AC 42 ms 3328 KB
09.txt AC 42 ms 3328 KB
10.txt AC 43 ms 3328 KB
11.txt AC 38 ms 3328 KB
12.txt AC 42 ms 3328 KB
13.txt AC 42 ms 3328 KB
14.txt AC 41 ms 3328 KB
15.txt AC 41 ms 3328 KB
16.txt AC 28 ms 3328 KB
17.txt AC 30 ms 3328 KB
18.txt AC 32 ms 3328 KB
19.txt AC 32 ms 3328 KB
20.txt AC 36 ms 3328 KB
21.txt AC 37 ms 3328 KB
22.txt AC 32 ms 3328 KB
23.txt AC 33 ms 3328 KB
24.txt AC 34 ms 3328 KB
25.txt AC 40 ms 3328 KB
26.txt AC 39 ms 3328 KB
27.txt AC 39 ms 3328 KB
28.txt AC 38 ms 3328 KB
29.txt AC 36 ms 3328 KB
30.txt AC 36 ms 3328 KB
31.txt AC 35 ms 3328 KB
32.txt AC 35 ms 3328 KB
33.txt AC 35 ms 3328 KB
34.txt AC 31 ms 3328 KB
35.txt AC 34 ms 3328 KB
36.txt AC 35 ms 3328 KB
37.txt AC 36 ms 3328 KB
38.txt AC 35 ms 3328 KB
39.txt AC 44 ms 3328 KB
40.txt AC 31 ms 3328 KB
41.txt AC 30 ms 3328 KB
42.txt AC 21 ms 3328 KB
43.txt AC 42 ms 3328 KB
44.txt AC 42 ms 3328 KB
45.txt AC 42 ms 3328 KB
46.txt AC 42 ms 3328 KB
47.txt AC 41 ms 3328 KB
48.txt AC 38 ms 3328 KB
49.txt AC 1 ms 256 KB
50.txt AC 1 ms 256 KB
51.txt AC 1 ms 256 KB
52.txt AC 1 ms 256 KB
53.txt AC 1 ms 256 KB
54.txt AC 1 ms 256 KB
55.txt AC 1 ms 256 KB
56.txt AC 1 ms 256 KB
57.txt AC 1 ms 256 KB
58.txt AC 1 ms 256 KB
59.txt AC 1 ms 256 KB
60.txt AC 1 ms 256 KB
61.txt AC 1 ms 256 KB
62.txt AC 1 ms 256 KB
63.txt AC 1 ms 256 KB
64.txt AC 1 ms 256 KB
s1.txt AC 1 ms 256 KB
s2.txt AC 1 ms 256 KB
s3.txt AC 1 ms 256 KB
s4.txt AC 1 ms 256 KB