uva10115 Automatic Editing

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <map>
#include <vector>
#include <set>
using namespace std;
#define N 300
char Find[100000][N];
char Replace[100000][N];
int main()
{
    int n;
    while(~scanf("%d", &n))
    {
        getchar();
        if(!n)
            break;
        char tmp[N];
        for(int i = 0; i < n; i++)
        {
            gets(tmp); strcpy(Find[i], tmp);
            gets(tmp);
            if(tmp[0]=='\n')
                Replace[i][0]==-1;
            else
                strcpy(Replace[i], tmp);
        }
        char a[N];
        gets(a); int len = strlen(a);
        for(int i = 0; i < n; i++)
        {
            int j = 0;
            while(j<len)
            {
                if(Find[i][0]==a[j])
                {
                    int len2 = strlen(Find[i]);
                    int k;
                    for(k = 0; k < len2; k++)
                        if(Find[i][k]!=a[j+k])
                            break;
                    if(k==len2)
                    {
                        for(k = 0; k < j; k++)
                            tmp[k] = a[k];
                        if(Replace[i][0]!=-1)
                            for(int g = 0; g < strlen(Replace[i]); g++)
                                tmp[k++] = Replace[i][g];
                        for(int g = j+len2; g < len; g++)
                            tmp[k++] = a[g];
                        tmp[k] = '\0';
                        //printf("tmp = %s\n", tmp);
                        strcpy(a, tmp);
                        len = strlen(a);
                        j = -1;
                    }
                }
                j++;
            }
        }
        printf("%s\n", a);
    }
    return 0;
}