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leetcode-algorithms/src/Maximum69Number.java at master · prashanthigupta/leetcode-algorithms · GitHub

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public class Maximum69Number {

public int maximum69Number (int num) {

int result = 0;

int divisor = 10_000;

boolean changed = false;

while (num > 0) {

result *= 10;

if (!changed && num / divisor == 6) {

result += 9;

changed = true;

} else {

result += num / divisor;

}

num -= (num / divisor) * divisor;

divisor /= 10;

}

return result;

}