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X is a good number if after rotating each digit individually by 180 degrees, we get a valid number that is different from X. Each digit must be rotated - we cannot choose to leave it alone.
A number is valid if each digit remains a digit after rotation. 0, 1, and 8 rotate to themselves; 2 and 5 rotate to each other; 6 and 9 rotate to each other, and the rest of the numbers do not rotate to any other number and become invalid.
Now given a positive number N, how many numbers X from 1 to N are good?
Example:
Input: 10
Output: 4
Explanation:
There are four good numbers in the range [1, 10] : 2, 5, 6, 9.
Note that 1 and 10 are not good numbers, since they remain unchanged after rotating.
The text was updated successfully, but these errors were encountered:
varrotatedDigits=function(N){letcounter=0;for(leti=1;i<=N;i++){letstrNumber=i.toString();//console.log("strNumber", strNumber)letrotation="";letdigit;for(letnum=0;num<strNumber.length;num++){digit=strNumber[num];if(digit==="3"||digit==="4"||digit==="7"){num+=strNumber.length;rotation=strNumber;}elseif(digit==="2"){rotation+="5"}elseif(digit==="5"){rotation+="2"}elseif(digit==="6"){rotation+="9"}elseif(digit==="9"){rotation+="6"}else{rotation+=digit;}}// console.log('strNumber is: ', strNumber)// console.log('rotation is: ', rotation)if(rotation!==strNumber){counter++;}}returncounter;};
X is a good number if after rotating each digit individually by 180 degrees, we get a valid number that is different from X. Each digit must be rotated - we cannot choose to leave it alone.
A number is valid if each digit remains a digit after rotation. 0, 1, and 8 rotate to themselves; 2 and 5 rotate to each other; 6 and 9 rotate to each other, and the rest of the numbers do not rotate to any other number and become invalid.
Now given a positive number N, how many numbers X from 1 to N are good?
Example:
Input: 10
Output: 4
Explanation:
There are four good numbers in the range [1, 10] : 2, 5, 6, 9.
Note that 1 and 10 are not good numbers, since they remain unchanged after rotating.
The text was updated successfully, but these errors were encountered: