ACM/ICPC ZOJ1006-Do the Untwist 解题代码

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;
int main()
{
	string array[30][2];
	string a,b;
	int t=0;
	while( cin >> a )
	{
		if ( a == "0" )
		{
			break;
		}
		else
		{
			cin >> b;
		}
		array[t][0] = a;
		array[t][1] = b;
		t++;
	}

	for ( int i = 0; i < t; i++ )
	{
		const char *p = array[i][0].c_str();
		int k = atoi(p);
		int len = array[i][1].size();
		int *ciphercode = new int[len];
		for ( int s = 0; s <len; s++ )
		{
			if ( array[i][1][s] == '.')
			{
				ciphercode[s] = 27;
			}
			else if ( array[i][1][s] == '_')
			{
				ciphercode[s] = 0;
			}
			else
			{
				ciphercode[s] = array[i][1][s] - 96;
			}
		}

		int *plaincode = new int[len];
		for ( int s = 0; s < len; s++ )
		{
			int pt = ( k*s )%len;
			plaincode[pt] = (ciphercode[s] + s)%28;
			
			//cout <<pt <<" "<< plaincode[pt] << " ";
		}
		//cout << endl;

		char *plaintext = new char[len];
		//cout << plaintext << endl;
		for ( int s = 0; s < len; s++ )
		{
			if (plaincode[s] == 0 )
			{
				plaintext[s] = '_';
			}
			else if (plaincode[s] == 27 )
			{
				plaintext[s] = '.';
			}
			else
			{
				plaintext[s] = plaincode[s] + 96;
			}
		}
		//string resut(plaintext);
		for ( int m = 0; m < len; m++ )
		{
			cout << plaintext[m];
		}
		cout << endl;
		delete [] plaincode;
		delete [] plaintext;
		delete [] ciphercode;
	}
	return 0;
}