実行結果例：

happpy_2[1]_% gcc -o kadai10-3 kadai10-3.c
happpy_2[2]_% kadai10-3
node[9].data = 1.63546 
node[8].data = 2.98526 
node[5].data = 3.18693 
node[1].data = 3.90478 
node[0].data = 5.8409 
node[6].data = 6.04144 
node[2].data = 6.91004 
node[3].data = 8.40485 
node[7].data = 8.46476 
node[4].data = 8.57378 
-----------------------
        sowa = 55.9482