Help him (Bestcoder Round #12) hdu 5059__ Open Your Mind

Help him
Time limit:2000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)
Total submission (s): 1829 accepted submission (s): 137


Problem Description

As you know the want to hack someone's program, you must submit your test data. However Sometimes you are submit invalid data, so we need a data checker to check your data. Now small W has prepared a problem for BC, but his is too busy to write the data checker. Please help him to write a data check which judges whether the ' input is ' an integer ranged from A to B (inclusive). Note:a string represents a valid integer when it follows below rules. 1. When it represents a non-negative an integer, it contains only digits without leading. 2. When it represents a negative an integer, it contains exact one negative sign ('-') followed by digits without leading OS and there are no characters before '-'. 3. Otherwise it is not a valid integer. Input

Multi test Cases (about), every case occupies two lines, the "a" contain a string which represents the input St Ring, then second line contains a and b separated by space. Process to the end of file. Length of string is no more than 100. The string may contain any characters other than ' \ n ', ' \ R '. -1000000000≤a≤b≤1000000000 Output

For each case output ' YES ' (without quote) when the ' string is ' an integer ranged from a to B, otherwise output ' NO ' (Withou T quote). Sample Input

10-100 1a0-100 Sample Output

YES NO

The following:

Determine if the string you are converting to numbers is legal, and the number size is within [a,b] range.

Analysis:

At first I wrote a lot of things to judge all kinds of illegal situations, and there may be escape characters, so write to the end or WA ... It turned out to be a very simple idea: simply convert the string to numbers first, use the Itoa function or the sprintf function, because the conversion will stop if an illegal character appears (for example: -10a54, the middle A is illegal, So this string is going to be-10 when converted to a number. And then convert the number to a string, and finally compare the string to the string it gives, and in [a,b], output yes if yes, or No.

conclusion: Ideas are important!!!

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main ()
{
    int a , b;
    Char m[110], c[110];

    while (gets (m))
    {
        scanf ("%d%d", &a,&b);
        GetChar ();
        int x = atoi (m);
        sprintf (c, "%d", x);
        Itoa (x,c,10);
        if (strcmp (m,c) = = 0 && x >=a && x <= B) puts ("YES");
        Else puts ("NO");
    return 0;
}