1 for (int c1
= 1; c1
< 2 * M
- 1; c1
+= 1) {
2 for (int c3
= max(-M
+ 1, -c1
+ 1); c3
< 0; c3
+= 1) {
3 for (int c7
= max(1, -M
+ c1
+ 1); c7
<= min(M
- 1, c1
+ c3
); c7
+= 1)
4 S1(c7
, c1
+ c3
- c7
, -c3
);
5 for (int c5
= max(-M
+ c1
+ 1, -c3
); c5
< min(M
, c1
); c5
+= 1)
6 S2(c1
- c5
, c3
+ c5
, c5
);
8 for (int c7
= max(1, -M
+ c1
+ 1); c7
<= min(M
- 1, c1
); c7
+= 1)