51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
#include <bits/stdc++.h>
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using namespace std;
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class Solution {
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public:
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bool isLessThan(string a, string b) {
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bool aIsNeg = false, bIsNeg = false;
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if (a[0] == '-') {
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aIsNeg = true;
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a = a.substr(1);
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}
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if (b[0] == '-') {
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bIsNeg = true;
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b = b.substr(1);
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}
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bool aIsPos = !aIsNeg, bIsPos = !bIsNeg;
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if (aIsNeg && bIsPos) return true;
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if (aIsPos && bIsNeg) return false;
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if (a.length() < b.length()) return aIsPos;
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if (a.length() > b.length()) return aIsNeg;
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for (int i = 0; i < a.length(); i++) {
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if (a[i] < b[i]) return aIsPos;
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if (a[i] > b[i]) return aIsNeg;
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}
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return false;
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}
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int reverse(int x) {
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bool isNeg = x < 0;
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string s = to_string(x);
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if (isNeg) s = s.substr(1);
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std::reverse(s.begin(), s.end());
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if (isNeg) {
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s = "-" + s;
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if (isLessThan(s, to_string(INT32_MIN))) s = "0";
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} else {
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if (isLessThan(to_string(INT32_MAX), s)) s = "0";
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}
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return atoi(s.c_str());
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}
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};
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