17暑假多校联赛4.11 HDU 6077 Time To Get Up

Time To Get Up

Time Limit: 2000/1000 MS (Java/Others)
Memory Limit: 524288/524288 K (Java/Others)
 

Problem Description

Little Q’s clock is alarming! It’s time to get up now! However, after reading the time on the clock, Little Q lies down and starts sleeping again. Well, he has 5 alarms, and it’s just the first one, he can continue sleeping for a while.
Little Q’s clock uses a standard 7-segment LCD display for all digits, plus two small segments for the ”:”, and shows all times in a 24-hour format. The ”:” segments are on at all times.

Your job is to help Little Q read the time shown on his clock.
 

Input

The first line of the input contains an integer T(1≤T≤1440), denoting the number of test cases.
In each test case, there is an 7×21 ASCII image of the clock screen.
All digit segments are represented by two characters, and each colon segment is represented by one character. The character ”X” indicates a segment that is on while ”.” indicates anything else. See the sample input for details.
 

Output

For each test case, print a single line containing a string t in the format of HH:MM, where t(00:00≤t≤23:59), denoting the time shown on the clock.
 

Sample Input

1.XX...XX.....XX...XX.X..X....X......X.X..XX..X....X.X....X.X..X......XX.....XX...XX.X..X.X....X....X.X..XX..X.X.........X.X..X.XX...XX.....XX...XX.

Sample Output

02:38

 
题目网址：http://acm.hdu.edu.cn/showproblem.php?pid=6077
 

分析

题意：当时没翻译题目，直接看到了图片还有样例输入输出，就明白是给出矩阵，输出矩阵显示的时间
因为他的输入都是7x21的矩阵，所以每个数的位置是固定的，只用推出是哪个数即可
根据中心两点是否为X可以分为两堆，再根据左上，右上，左下，右下将各个数分辨出来，这种方法直接将4个位置一起考虑，可以直接写一个函数调用4次就行了
因为是时间第一个位置只能为0，1，2，第三个位置只能为0，1，2，3，4，5，6，所以也可以少几次判断
也可以直接将每个数的点给列出，判断满足哪个数的情况就输出谁，不过这样会使代码很长很乱
 

代码

#include <bits/stdc++.h>using namespace std;char alarm[8][22];int change(int x){    if(alarm[3][x]=='X')    {        if(alarm[2][x-1]=='.')        {            if(alarm[4][x-1]=='.')return(3);            return(2);        }        if(alarm[2][x+2]=='.')        {            if(alarm[4][x-1]=='.')return(5);            return(6);        }        if(alarm[4][x-1]=='.')        {            if(alarm[6][x]=='.')return(4);            return(9);        }        return(8);    }    if(alarm[6][x]=='.')    {        if(alarm[0][x]=='.')return(1);        return(7);    }    return(0);}int main(){    int T;    scanf("%d",&T);    getchar();    while(T--)    {        for(int i=0; i<7; i++)        {            for(int j=0; j<21; j++)scanf("%c",&alarm[i][j]);            getchar();        }        printf("%d%d:%d%d\n",change(1),change(6),change(13),change(18));    }}