C 解法, 执行用时: 2ms, 内存消耗: 228KB, 提交时间: 2019-01-14

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
    char head[4];
    char s[21];
    int tel_lab;
    int T;
    int i,j;
    int num_count;
    int len;
    scanf("%d",&T);
    for(i=0;i<T;i++)
    {
        tel_lab = 0;
        num_count = 0;
        memset(s,0,sizeof(s));
        memset(head,0,sizeof(head));
        scanf("%s",&s);
        len = strlen(s);
        if(len!=11)
        {
            printf("-1\n");
            continue;
        }
        for(j=0;j<3;j++)
            head[j] = s[j];
        if(strcmp("133",head)==0||strcmp("153",head)==0||strcmp("180",head)==0||strcmp("181",head)==0||strcmp("189",head)==0)
            tel_lab = 1;
        else if(strcmp("130",head)==0||strcmp("131",head)==0||strcmp("155",head)==0||strcmp("185",head)==0||strcmp("186",head)==0)
            tel_lab = 2;
        else if(strcmp("135",head)==0||strcmp("136",head)==0||strcmp("150",head)==0||strcmp("182",head)==0||strcmp("188",head)==0)
            tel_lab = 3;
        for(j=3;j<11;j++)
        {
            if(s[j]>='0'&&s[j]<='9')
                num_count++;
            else
                continue;
        }
        if(num_count==8&&tel_lab==1)
            printf("China Telecom\n");
        else if(num_count==8&&tel_lab==2)
            printf("China Unicom\n");
        else if(num_count==8&&tel_lab==3)
            printf("China Mobile Communications\n");
        else
            printf("-1\n");
    }
}

C 解法, 执行用时: 2ms, 内存消耗: 328KB, 提交时间: 2021-09-19

#include<stdio.h>
#include<string.h>
int main()
{
    char a[1000];
    int n,i;
    while (scanf("%d",&n)!=EOF)
    {
        getchar();
    	for(i=0;i<n;i++)
    	{
    	gets(a);
        if(strlen(a)!=11) printf("-1\n");
        else 
        {
            if((a[1]=='3'&&a[2]=='3')||(a[1]=='5'&&a[2]=='3')||(a[1]=='8'&&a[2]=='0')||(a[1]=='8'&&a[2]=='1')||(a[1]=='8'&&a[2]=='9'))
            {
                printf("China Telecom\n");
            }
            else if((a[1]=='3'&&a[2]=='0')||(a[1]=='3'&&a[2]=='1')||(a[1]=='5'&&a[2]=='5')||(a[1]=='8'&&a[2]=='5')||(a[1]=='8'&&a[2]=='6'))
            {
                printf("China Unicom\n");
            }
            else if((a[1]=='3'&&a[2]=='5')||(a[1]=='3'&&a[2]=='6')||(a[1]=='5'&&a[2]=='0')||(a[1]=='8'&&a[2]=='2')||(a[1]=='8'&&a[2]=='8'))
            {
                printf("China Mobile Communications\n");
            }
            else printf("-1\n");
        }
		}
    }
    return 0;
}