Substring with Concatenation of All Words:判断目标串包含排列组合的模式串的起始位置
Youaregivenastring,s,andalistofwords,words,thatareallofthesamelength.Findallstartingindicesofsubstring(s)insthatisaconcatenationofeachwordinwordsexactlyonceandwithoutanyinterveningcharacters.Example1