poj 1051（水题，注意memset的使用和字符串操作）

#include<iostream>
#include<cctype>
#include<cstring>
#include<string>
using namespace std;
int main(){
    char a[][5] = {".-","-...","-.-.","-..",".","..-.","--.",
                   "....","..",".---","-.-",".-..","--","-.",
                   "---",".--.","--.-",".-.","...","-","..-",
                   "...-",".--","-..-","-.--","--..",
                   "..--",".-.-","---.","----"};
    int tmp,start,i,j,len,count = 0,n,data[105];
    char source[105],target[405],mid[5];
    scanf("%d",&n);
    while(count<n){
        memset(target,0,sizeof(target));
        scanf("%s",source);
        len = strlen(source);
        for(i=0;i<len;i++){
            if(isalpha(source[i])){
                data[i] = strlen(a[source[i]-'A']);
                strcat(target,a[source[i]-'A']);
            }
            else{
                data[i] = 4;
                if(source[i]=='_')    strcat(target,a[26]);
                if(source[i]==',')    strcat(target,a[27]);
                if(source[i]=='.')    strcat(target,a[28]);
                if(source[i]=='?')    strcat(target,a[29]);
            }
        }
        for(i=0;i<(len+1)/2;i++){
            tmp = data[i];
            data[i] = data[len-1-i];
            data[len-1-i] = tmp;
        }
//        cout<<target<<endl;
//        for(i=0;i<len;i++)
//            cout<<data[i];
//        cout<<endl;
        printf("%d: ",++count);
        start = 0;
        for(i=0;i<len;i++){
            if(i>0)    start += data[i-1];
            for(j=start;j<start+data[i];j++){
                mid[j-start] = target[j];
            }
            mid[data[i]] = '\0';
            for(j=0;j<=29;j++){
                if(strcmp(a[j],mid)==0){
                    if(j<26)    printf("%c",'A'+j);
                    if(j==26)    printf("_");
                    if(j==27)    printf(",");
                    if(j==28)    printf(".");
                    if(j==29)    printf("?");
                }
            }
        }
        printf("\n");
    }
    return 0;
}