1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | class Solution {public: string replaceSpace(string str) { stack<int> Mystack; int length=str.length(); int blankCount=0; for(int i=0;i<length;i++) { if(str[i]==' ') { Mystack.push(i); blankCount++; } } int newLength=length+blankCount*2; string newstr(newLength,'0'); int blankIndex=0; int i=length-1; int j=newLength-1; while(!Mystack.empty()) { blankIndex=Mystack.top(); Mystack.pop(); while(i>blankIndex) { newstr[j]=str[i]; j--; i--; } newstr[j--]='0'; newstr[j--]='2'; newstr[j--]=(char)(37); i--; } while(i>=0) { newstr[j]=str[i]; j--; i--; } return newstr; }}; |