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3-1-3.cpp

+#include<iostream>
+#include<string>
+#include<algorithm>
+using namespace std;
+#define n 10
+string dezero(string a)
+{
+	long int i;
+	for (i = 0;i < a.length();i++)
+	{
+		if (a.at(i) > 48) break;
+	}
+	if (i == a.length()) return "0";
+	a.erase(0, i);
+	return a;
+}
+string add(string a, string b)
+{
+	a = dezero(a);
+	b = dezero(b);
+	string c;
+	string d = "0";
+	long int kmin, kmax, i;
+	reverse(a.begin(), a.end());
+	reverse(b.begin(), b.end());
+	if (a.length() > b.length()) { kmin = b.length();kmax = a.length();c = a; }
+	else { kmin = a.length();kmax = b.length();c = b; }
+	c.insert(c.length(), d);
+	for (i = 0;i < kmin;i++)
+	{
+		if (a.at(i) >= 48 && a.at(i) <= 57) a.at(i) -= 48;
+		if (a.at(i) >= 97 && a.at(i) <= 122) a.at(i) -= 87;
+		if (b.at(i) >= 48 && b.at(i) <= 57) b.at(i) -= 48;
+		if (b.at(i) >= 97 && b.at(i) <= 122) b.at(i) -= 87;
+		c.at(i) = a.at(i) + b.at(i);
+	}
+	for (i = kmin;i < kmax + 1;i++)
+	{
+		if (c.at(i) >= 48 && c.at(i) <= 57) c.at(i) -= 48;
+		if (c.at(i) >= 97 && c.at(i) <= 122) c.at(i) -= 87;
+	}
+	for (i = 0;i < kmax;i++)
+	{
+		if (c.at(i) >= n)
+		{
+			c.at(i + 1) += c.at(i) / n;
+			c.at(i) = c.at(i) % n;
+		}
+	}
+	if (c.at(kmax) == 0)
+	{
+		c.erase(kmax, kmax + 1);
+	}
+	for (i = 0;i < c.length();i++)
+	{
+		if (c.at(i) >= 10) c.at(i) += 87;
+		if (c.at(i) < 10) c.at(i) += 48;
+	}
+	reverse(c.begin(), c.end());
+	return c;
+}
+int main()
+{
+	string a, b;
+	while (cin >> a >> b)
+	{
+		cout << add(a, b);
+	}
+	return 0;
+}
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