generated from threeal/project-starter
-
Notifications
You must be signed in to change notification settings - Fork 1
/
solution.cpp
79 lines (71 loc) · 2.73 KB
/
solution.cpp
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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
#include <vector>
class Solution {
public:
int numMagicSquaresInside(std::vector<std::vector<int>>& grid) {
int num{0};
for (int i = grid.size() - 2; i > 0; --i) {
for (int j = grid[i].size() - 2; j > 0; --j) {
if (grid[i][j] != 5) continue;
switch (grid[i - 1][j - 1]) {
case 2:
switch (grid[i - 1][j]) {
case 9:
if (grid[i - 1][j + 1] == 4 && grid[i][j - 1] == 7 &&
grid[i][j + 1] == 3 && grid[i + 1][j - 1] == 6 &&
grid[i + 1][j] == 1 && grid[i + 1][j + 1] == 8) ++num;
break;
case 7:
if (grid[i - 1][j + 1] == 6 && grid[i][j - 1] == 9 &&
grid[i][j + 1] == 1 && grid[i + 1][j - 1] == 4 &&
grid[i + 1][j] == 3 && grid[i + 1][j + 1] == 8) ++num;
break;
}
break;
case 4:
switch (grid[i - 1][j]) {
case 3:
if (grid[i - 1][j + 1] == 8 && grid[i][j - 1] == 9 &&
grid[i][j + 1] == 1 && grid[i + 1][j - 1] == 2 &&
grid[i + 1][j] == 7 && grid[i + 1][j + 1] == 6) ++num;
break;
case 9:
if (grid[i - 1][j + 1] == 2 && grid[i][j - 1] == 3 &&
grid[i][j + 1] == 7 && grid[i + 1][j - 1] == 8 &&
grid[i + 1][j] == 1 && grid[i + 1][j + 1] == 6) ++num;
break;
}
break;
case 6:
switch (grid[i - 1][j]) {
case 7:
if (grid[i - 1][j + 1] == 2 && grid[i][j - 1] == 1 &&
grid[i][j + 1] == 9 && grid[i + 1][j - 1] == 8 &&
grid[i + 1][j] == 3 && grid[i + 1][j + 1] == 4) ++num;
break;
case 1:
if (grid[i - 1][j + 1] == 8 && grid[i][j - 1] == 7 &&
grid[i][j + 1] == 3 && grid[i + 1][j - 1] == 2 &&
grid[i + 1][j] == 9 && grid[i + 1][j + 1] == 4) ++num;
break;
}
break;
case 8:
switch (grid[i - 1][j]) {
case 1:
if (grid[i - 1][j + 1] == 6 && grid[i][j - 1] == 3 &&
grid[i][j + 1] == 7 && grid[i + 1][j - 1] == 4 &&
grid[i + 1][j] == 9 && grid[i + 1][j + 1] == 2) ++num;
break;
case 3:
if (grid[i - 1][j + 1] == 4 && grid[i][j - 1] == 1 &&
grid[i][j + 1] == 9 && grid[i + 1][j - 1] == 6 &&
grid[i + 1][j] == 7 && grid[i + 1][j + 1] == 2) ++num;
break;
}
break;
}
}
}
return num;
}
};