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Submission #71702

# Submission time Handle Problem Language Result Execution time Memory
71702 2018-08-25T12:12:23 Z the_general(#2235, dbtlswkdrnss) Cross on the Grid (FXCUP3_cross) C++
0 / 100
 3 ms 404 KB 
#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)+b(x-1)-a(x-2)+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)+a(x-1)-b(x-2)+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;
}

int main(){
	scanf("%d", &n);
	printf("%d", (d(n))%MOD);
}

Compilation message

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
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Incorrect 3 ms 404 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Incorrect 3 ms 404 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Incorrect 3 ms 404 KB Output isn't correct
5 Halted 0 ms 0 KB -