Matrix
0 1 0 0 0
-2 0 7 0 1
0 0 -9 0 0
-6 0 0 6 4
7 -6 0 6 0
vector<t> e
1 -2 7 1 -9 -6 6 4 7 -6 6
iMap[1] (2, 0)
iMap[2] (1, 1) (3, 2) (5, 3)
iMap[3] (3, 4)
iMap[4] (1, 5) (4, 6) (5, 7)
iMap[5] (1, 8) (2, 9) (4, 10)
jMap[1] (2, 1) (4, 5) (5, 8)
jMap[2] (1, 0) (5, 9)
jMap[3] (2, 2) (3, 4)
jMap[4] (4, 6) (5, 10)
jMap[5] (2, 3) (4, 7)