Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
int reverse(int x) {
if (0 == x) return 0;
bool sign = x > 0 ? true : false;
long long r = 0;
long long t = x;
t = t > 0 ? t : -t;
for (;t;t/=10) {
r = r * 10 + t % 10;
}
if (sign && r > 2147483647 || !sign && r > 2147483648)
return 0;
return sign ? (int)r : (int)(-r);
}
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本文标题：7. Reverse Integer
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