Puzzle UVa227（分析和问题解决）

#include<stdio.h>
#include<string.h>
//#define LOCAL

char puzzle[35];


// the function to change position.
// A is the movement.
// B is the array of Puzzle.
int chposition(char a, char b[])
{
    char c(‘0‘);
    char* temp = strchr(b, ‘ ‘);
    // return 1 when occurs the wrong move or out of the range.
    if( a == ‘A‘)
    {    if(temp-5 < b) return 1; c = *(temp-5); *(temp-5) = *temp; *temp = c; temp = temp - 5;}
    else if( a == ‘B‘)
    {    if(temp+5 > b+24) return 1;    c = *(temp+5); *(temp+5) = *temp; *temp = c; temp = temp + 5; }
    else if( a == ‘L‘)
    {    if((temp-b)%5-1 < 0) return 1; c = *(temp-1); *(temp-1) = *temp; *temp = c; temp = temp - 1; }
    else if( a == ‘R‘)
    {    if((temp-b)%5+1 > 4 ) return 1; c = *(temp+1); *(temp+1) = *temp; *temp = c; temp = temp + 1;}
    else return 1;
    return 0;
    
}

int main()
{
    //overload the printf and scanf.
    #ifdef LOCAL
    freopen("data.in", "r", stdin);
    freopen("data.out", "w", stdout);
    #endif
    int count = 0;
    int first = 1;
    while(true)
    {
        memset(puzzle,0,35);
        count++;
        char c = getchar();
        //if ( c == ‘\n‘) c = getchar();    //ignore the ‘\n‘
        if( c == ‘Z‘) break;              //‘Z‘ the signal of the end.
        else puzzle[0] = c;
        int i = 1;
        for(; i < 25; i++)
        {
            puzzle[i] = getchar();
            if(puzzle[i] == ‘\n‘) i--;
        }
        int flag = 0;
        int taq(0);
        while( (c = getchar()) && c != ‘0‘)
        {
            if(c == ‘\n‘)continue;
            flag = chposition(c, puzzle);
            if(flag == 1)  taq = 1; 
        }
        getchar();
        if( first == 1) {
            first = 0;
        }
        else{
            putchar(‘\n‘);
        }    
        printf("Puzzle #%d:\n",count);
        if(taq) 
            printf("This puzzle has no final configuration.\n");
        else
        {
            for(i = 0; i <25; i++)
            {
                if((i+1)%5 == 0)printf("%c\n", puzzle[i]);
                else
                {
                    printf("%c ", puzzle[i]);
                }
            }
        }
    }
    return 0;
}