Submission #71704

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
71704	2018-08-25 12:30:42	the_general (#119)	Cross on the Grid (FXCUP3_cross)	C++98	22 / 100	1073 ms	576 KiB

cross

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include<stdio.h>
#define MOD 1000000007
int a(int);
int b(int);
int c(int);
int d(int);
int n;
int a(int x){
  if(x<3) return 0;
  if(x==3) return 1;
  return (c(x-2)+d(x-3)-b(x-3)+b(x-2)+d(x-3))%MOD;
}
int b(int x){
  if(x<3) return 0;
  if(x==3) return 1;
  return (c(x-2)+d(x-3)-a(x-3)+a(x-2)+d(x-3))%MOD;
}
int c(int x){
  if(x<3) return 0;
  if(x==3) return 1;
  return (a(x-2)+b(x-2)+d(x-3))%MOD;
}
int d(int x){
  if(x==1 || x==2) return 1;
  return ((a(x)+b(x))%MOD+c(x)+d(x-1))%MOD;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Compilation message (stderr)

cross.cpp: In function 'int main()':
cross.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 0 / 35
• Subtask 3: 0 / 43