#include <iostream>
#include <vector>

namespace {

class Solution {
public:
    bool isPalindrome(int x) {
        if (x < 0)
            return false;       

        std::vector<int> v;       
        v.reserve(32);

        while (x > 0) {
            int z = x % 10;
            x = x / 10;
            v.emplace_back(z);
        }

        for (size_t i = 0; i < v.size(); ++i) {
            if (v[i] != v[v.size() - 1 - i])
                return false;
        }

        return true;
    }
};

};

#include <gtest/gtest.h>

Solution s;

TEST(P9, 1) {
    EXPECT_EQ(s.isPalindrome(121), true);
}

TEST(P9, 2) {
    EXPECT_EQ(s.isPalindrome(-121), false);
}

TEST(P9, 3) {
    EXPECT_EQ(s.isPalindrome(10), false);
}