Bestcoder HDU5059 Help him 字符串处理

Help him

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 248    Accepted Submission(s): 58

Problem Description

As you know, when you want to hack someone's program, you must submit your test data. However sometimes you will submit invalid data, so we need a data checker to check your data. Now small W has prepared a problem for BC, but he 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 integer, it contains only digits without leading zeros.
2. When it represents a negative integer, it contains exact one negative sign ('-') followed by digits without leading zeros and there are no characters before '-'.
3. Otherwise it is not a valid integer.

 

Input

Multi test cases (about 100), every case occupies two lines, the first line contain a string which represents the input string, 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$\leq a \leq b \leq 1000000000$

 

Output

For each case output "YES" (without quote) when the string is an integer ranged from a to b, otherwise output "NO" (without quote).

 

Sample Input

10
-100 100
1a0
-100 100

 

Sample Output

YES
NO

 

Source

BestCoder Round #12

 

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heyang   |   We have carefully selected several similar problems for you:  5061 5060 5057 5056 5053 

 

SB了。。

以后 注意点用atoi...  可能过long long 用 strtoll

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char S[200];
char C[200];
int len;
long long a,b;
int getans(char *A)
{
	int i;
	int lena=strlen(A);
	if(lena==0) return 0;
	if(lena!=1&&A[0]=='0') return 0;
	for(i=0;i<lena;i++)
	if(!('0'<=A[i]&&A[i]<='9')) return 0;
	return 1; 
}
int main()
{
	freopen("a.in","r",stdin);
	freopen("a.out","w",stdout);
	int ans;
	long long k;
	while(gets(S)!=NULL)
	{
		scanf("%I64d%I64d",&a,&b);
		gets(C);
		len=strlen(S);
		if(S[0]=='-'&&S[1]=='0')  { printf("NO\n");continue;}	
		if(len>11||len==0) { printf("NO\n");continue;}	
		if(len==11&&S[0]!='-') { printf("NO\n");continue;}	
		if(S[0]=='-')
		ans=getans(S+1);
		else ans=getans(S);
		if(!ans) { printf("NO\n");continue;}
		else
		  {
		  	k=strtoll(S,NULL,10);
			if(a<=k&&k<=b) printf("YES\n");	
			else printf("NO\n");
		  }
		  		memset(S,0,sizeof(S));
	}
	return 0;
}

学长的十分美好的代码

const int N = 105;
char s[N], t[N];
int a, b, c;
bool solve(){
if(sscanf(s, "%d", &c) != 1) return 0;
sprintf(t, "%d", c);
if(strcmp(s, t) != 0) return 0;
return a<=c && c<=b;
}
int main(){
//freopen("in.txt", "r", stdin);
while(gets(s)){
scanf("%d%d", &a, &b);
getchar();
bool ans = solve();
puts(ans ? "YES" : "NO");
}
return 0;
}