Submission #62608

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
62608	2018-07-29 10:22:29	imsifile	Cross on the Grid (FXCUP3_cross)	C++14	100 / 100	3 ms	540 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>
#include<memory.h>
typedef long long lld;
const lld mod = 1000000007;
struct mat {
  lld ba[9][9];
  mat operator* (const mat &c){
    mat res; memset(res.ba, 0, sizeof(res.ba));
    for(int i=0; i<9; i++){
      for(int j=0; j<9; j++){
        for(int k=0; k<9; k++) res.ba[i][j] += ba[i][k]*c.ba[k][j];
        res.ba[i][j] %= mod;
      }
    }
    return res;
  }
} base, res;
int N;
int main(){
  scanf("%d", &N); N-=4;
  if(N<0){ puts("4"); return 0; }
  memset(base.ba, 0, sizeof(base.ba));
  memset(res.ba, 0, sizeof(res.ba));
  for(int i=0; i<9; i++) res.ba[i][i] = 1;
  base.ba[0][0] = base.ba[0][1] = base.ba[0][2] = base.ba[0][3] = 1;
  base.ba[1][4] = base.ba[1][5] = base.ba[2][6] = base.ba[3][7] = base.ba[3][8] = 1;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Compilation message (stderr)

cross.cpp: In function 'int main()':
cross.cpp:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N); N-=4;
  ~~~~~^~~~~~~~~~

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