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007_Reverse_Integer.java

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class Solution {

public int reverse(int x) {

if (x == 0) return 0;

long res = 0;

while (x != 0) {

res = res * 10 + x % 10;

if (res > Integer.MAX_VALUE || res < Integer.MIN_VALUE)

return 0;

x /= 10;

}

return (int) res;

}

}