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78 changes: 78 additions & 0 deletionscpp/0008-string-to-integer.cpp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| #include<bits/stdc++.h> | ||
| using namespace std; | ||
| /* | ||
| Implement the myAtoi(string s) function, which converts a string to a 32-bit signed integer. | ||
| The algorithm for myAtoi(string s) is as follows: | ||
| Whitespace: Ignore any leading whitespace (" "). | ||
| Signedness: Determine the sign by checking if the next character is '-' or '+', assuming positivity if neither present. | ||
| Conversion: Read the integer by skipping leading zeros until a non-digit character is encountered or the end of the string is reached. If no digits were read, then the result is 0. | ||
| Rounding: If the integer is out of the 32-bit signed integer range [-231, 231 - 1], then round the integer to remain in the range. Specifically, integers less than -231 should be rounded to -231, and integers greater than 231 - 1 should be rounded to 231 - 1. | ||
| Return the integer as the final result. | ||
| Example : | ||
| Input: s = " -042" | ||
| Output: -42 | ||
| Explanation: | ||
| Step 1: " -042" (leading whitespace is read and ignored) | ||
| ^ | ||
| Step 2: " -042" ('-' is read, so the result should be negative) | ||
| ^ | ||
| Step 3: " -042" ("042" is read in, leading zeros ignored in the result) | ||
| */ | ||
| class Solution { | ||
| public: | ||
| int myAtoi(string s) { | ||
| int sign=1; | ||
| bool tag=false; | ||
| int j=0,ind; | ||
| double ans=0; | ||
| // trim the string till we get number | ||
| for (int i=0;i<s.size();i++){ | ||
| if (s[i]==' ') { | ||
| continue;} | ||
| else{ | ||
| if (s[i]=='-') { | ||
| sign =-1; | ||
| j=i+1; | ||
| break; | ||
| } | ||
| else if(s[i]=='+'){ | ||
| sign=1; | ||
| j=i+1; | ||
| break; | ||
| } | ||
| else{ | ||
| j=i; | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| // convert string to integer | ||
| for (int i=j;i<s.size();i++){ | ||
| if (int(s[i])>47 && int(s[i])<58){ | ||
| ans=ans*10; | ||
| ans=ans+int(s[i])-48; | ||
| } | ||
| else { | ||
| break; | ||
| } | ||
| } | ||
| ans=sign*ans; | ||
| long long y=pow(2,31); | ||
| if (ans <-1*y) return -1*y; | ||
| else if (ans > y-1) return y-1; | ||
| else return ans; | ||
| } | ||
| }; |
51 changes: 51 additions & 0 deletionspython/0008-string-to-integer.py
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| ''' | ||
| Implement the myAtoi(string s) function, which converts a string to a 32-bit signed integer. | ||
| The algorithm for myAtoi(string s) is as follows: | ||
| Whitespace: Ignore any leading whitespace (" "). | ||
| Signedness: Determine the sign by checking if the next character is '-' or '+', assuming positivity if neither present. | ||
| Conversion: Read the integer by skipping leading zeros until a non-digit character is encountered or the end of the string is reached. If no digits were read, then the result is 0. | ||
| Rounding: If the integer is out of the 32-bit signed integer range [-231, 231 - 1], then round the integer to remain in the range. Specifically, integers less than -231 should be rounded to -231, and integers greater than 231 - 1 should be rounded to 231 - 1. | ||
| Return the integer as the final result. | ||
| Example : | ||
| Input: s = " -042" | ||
| Output: -42 | ||
| Explanation: | ||
| Step 1: " -042" (leading whitespace is read and ignored) | ||
| ^ | ||
| Step 2: " -042" ('-' is read, so the result should be negative) | ||
| ^ | ||
| Step 3: " -042" ("042" is read in, leading zeros ignored in the result) | ||
| ''' | ||
| class Solution: | ||
| def myAtoi(self, s: str) -> int: | ||
| s=s.strip() | ||
| sign=1 | ||
| if len(s)==0: | ||
| return 0 | ||
| if s[0]=="-" or s[0]=="+" : | ||
| sign=-1 if s[0]=="-" else 1 | ||
| s=s[1:] | ||
| l=0 | ||
| for c in s: | ||
| k=ord(c)-48 | ||
| if k in range(0,10): | ||
| l=l*10 | ||
| l=l+k | ||
| else: | ||
| break | ||
| n=sign*l | ||
| if n>=(2**31): | ||
| return (2**31)-1 | ||
| elif n<(-(2**31)): | ||
| return -(2**31) | ||
| return n |
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