POJ2351-Time Zones

http://poj.org/problem?id=2351

烦烦更健康。。。

#include<stdio.h>
#include<string.h>
char *x[]={
"WET","0",
"UTC","0",
"GMT","0",
"BST","+1",
"IST","+1",
"WEST","+1",
"CET","+1",
"CEST","+2",
"EET","+2",
"EEST","+3",
"MSK","+3",
"MSD","+4",
"AST","-4",
"ADT","-3",
"NST","-3.5",
"NDT","-2.5",
"EST","-5",
"EDT","-4",
"CST","-6",
"CDT","-5",
"MST","-7",
"MDT","-6",
"PST","-8",
"PDT","-7",
"HST","-10",
"AKST","-9",
"AKDT","-8",
"AEST","+10",
"AEDT","+11",
"ACST","+9.5",
"ACDT","+10.5",
"AWST","+8"};
int i,j,k,h,m,n,N,time;
char buf[100];
float off;
int main(void)
{
    scanf("%d",&N);
    while(N--)
    {
        scanf("%s",buf);
        if(!strcmp(buf,"noon")) 
           time=12*60;
        else if(!strcmp(buf,"midnight"))
           time=0;
        else 
        {
            sscanf(buf,"%d:%d",&h,&m);
            if(h==12) 
               h=0;
            time=h*60+m;
            scanf("%s",buf);
            if(!strcmp(buf,"p.m.")) 
               time+=12*60;
        }
        scanf("%s",buf);
        for(i=0;*x[i]&&strcmp(x[i],buf);i++);
           sscanf(x[i+1],"%f",&off);
        time-=60*off; 
        scanf("%s",buf);
        for(i=0;*x[i]&&strcmp(x[i],buf);i++);
           sscanf(x[i+1],"%f",&off);
        time+=60*off; 
        time=(time+24*60)%(24*60);
        if(time==0) 
           printf("midnight\n");
        else if(time==12*60) 
           printf("noon\n");
        else
        {
            h=time/60%12;
            if(h==0) 
               h=12;
            m=time%60;
            printf("%d:%02d %s\n",h,m,time>12*60?"p.m.":"a.m.");
        }
     }
     return 0;
}