10082 - WERTYU UVA Online Judge

#include <stdio.h>
#include <string.h>
#include <ctype.h>

#define LIM 10001

int buscaVet(char c, char vet[]);

int main()
{
    int i, a;
    char alf1[] = "qwertyuiop[]";
    char alf2[] = "asdfghjkl;'";
    char alf3[] = "zxcvbnm,./";
    char str[LIM], carac;

    fflush(stdin);
    gets(str);

    while(strcmp(str, "") != 0)
    {
        for(i = 0; str[i] != '\0'; i++)
        {
                a = buscaVet(str[i], alf1);

                if(a == -1)
                {
                    a = buscaVet(str[i], alf2);

                    if(a == -1)
                    {
                        a = buscaVet(str[i], alf3);

                        if(a != -1)
                            carac = alf3[a - 1];
                    }
                    else
                        carac = alf2[a - 1];
                }
                else
                    carac = alf1[a - 1];

                if(a != -1)
                    str[i] = toupper(carac);
        }

        printf("%s\n", str);

        fflush(stdin);
        gets(str);
    }

    return 0;
}

int buscaVet(char c, char vet[])
{
    int pos = 0;

    while(pos < strlen(vet) && vet[pos] != tolower(c))
        pos++;

    if(pos == strlen(vet))
        pos = -1;

    return pos;
}