为什么测试数据1的输入数据是这样的啊

8 15
8.46 6.03 3.73 0.32 7.43 3.71 8.04 8.22 
3 1 8
1 2 8 -2.7566713364794850E+0000
1 2 8  2.1308819339610636E+0000
1 1 6  1.5912831262685359E+0000
1 1 8 -2.7779214559122920E+0000
1 1 8 -6.5134523715823889E-0001
3 2 8
1 1 6 -8.5440817382186651E-0001
3 2 8
2 2 8
3 2 7
1 3 8 -1.8737916438840330E+0000
1 1 7  2.5193137815222144E+0000
1 3 8  1.2835426828823984E+0000
3 3 8

为什么是科学计数法