13题,String availableTriangle = "";改为StringBuffer availableTriangle = "";
最后return availableTriangle.toString();
long aTmp = a * a;扔到循环外面
long cTmp = c * c;写long cTmp = 0放到循环外
ctmp=c*c放到2个循环之间
for (int c = a + 1; c < maxc; c++) {
ctmp=c*c;
for (int b = c - a + 1; b < c; b++) {
最后return availableTriangle.toString();
long aTmp = a * a;扔到循环外面
long cTmp = c * c;写long cTmp = 0放到循环外
ctmp=c*c放到2个循环之间
for (int c = a + 1; c < maxc; c++) {
ctmp=c*c;
for (int b = c - a + 1; b < c; b++) {
toDo(4,10)就什么也得不到~~~