UVa 11946 - Code Number

#include <iostream>
#include <string>
using namespace std;

int main() {

	char decode[256];
	for (char ch = 'A'; ch <= 'Z'; ch++)
		decode[ch] = ch;
	string encoded = "H3LL0 MY L0V3, 1 M H499Y 83C4U53 500N 1 W1LL 83 70 Y0UR 51D3. 7H15 71M3 W17H0U7 Y0U H45 833N 373RN4L. 1 1NV173 Y0U 70 7H3 200 0N3 70 533 7H3 238R45 4ND 60R1L45.";
	string decoded = "HELLO MY LOVE, I M HAPPY BECAUSE SOON I WILL BE TO YOUR SIDE. THIS TIME WITHOUT YOU HAS BEEN ETERNAL. I INVITE YOU TO THE ZOO ONE TO SEE THE ZEBRAS AND GORILAS.";
	for (int i = 0; i < encoded.length(); i++)
		decode[encoded[i]] = decoded[i];

	int cases;
	cin >> cases;
	string line;
	getline(cin, line);
	for (; cases; cases--) {
		getline(cin, line);
		while (line.length() > 0) {
			for (int i = 0; i < line.length(); i++)
				cout << decode[line[i]];
			cout << endl;
			getline(cin, line);
		}
		if (cases > 1)
			cout << endl;
	}

	return 0;
}