algorithm
判断整数乘法会不会溢出：
// rev * multi
// 正数溢出
if (rev > INT_MAX/10 || (rev == INT_MAX / 10 &&multi > 7)){
return 0;
}
// 负数溢出
if (rev < INT_MIN/10 || (rev == INT_MIN / 10 && multi < -8)) {
return 0;
}
判断整数乘法会不会溢出：
// rev * multi
// 正数溢出
if (rev > INT_MAX/10 || (rev == INT_MAX / 10 &&multi > 7)){
return 0;
}
// 负数溢出
if (rev < INT_MIN/10 || (rev == INT_MIN / 10 && multi < -8)) {
return 0;
}
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本文标题：7. Reverse Integer
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