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用next_permutation加上自己写的cmp函数过了。。cmp的函数,下面Sort和next_permutation直接调用就好了。。。。 bool cmp(char a,char b) { int t='a'-'A'; if(isupper(b)&&islower(a)) { b+=t; if(a==b) return false; return a<b; } else if(isupper(a)&&islower(b)) { a+=t; if(a==b )return true; return a<b; } else return a<b; } Followed by:
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