LightOJ1014 Ifter Party

Description
I have an Ifter party at the 5th day of Ramadan for the contestants. For this reason I have invited C contestants and arranged P piaju's (some kind of food, specially made for Ifter). Each contestant ate Q piaju's and L piaju's were left (L < Q).
Now you have to find the number of piaju's each contestant ate.
Input
Input starts with an integer T (≤ 325), denoting the number of test cases.
Each case contains two non-negative integers P and L (0 ≤ L < P < 231).
Output
For each case, print the case number and the number of possible integers in ascending order. If no such integer is found print 'impossible'.
Sample Input
4
10 0
13 2
300 98
1000 997
Sample Output
Case 1: 1 2 5 10
Case 2: 11
Case 3: 101 202
Case 4: impossible

求n - l 比l 大的约数,暴力即可。


#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
#define INF 0x3f3f3f3f
typedef long long LL;
int s[1000005];
int main() {
    LL a,b;
    int t;
    scanf("%d",&t);
    for(int i=1;i<=t;i++){
        scanf("%lld%lld",&a,&b);
        LL n=a-b;
        if(2*b>a){
            printf("Case %d: impossible\n",i);
            continue;
        }
        LL m=sqrt(n+0.5);
        int cnt=0;
        int flag=0;
        for(int i=1;i<=m;i++){
            if(n%i==0){
                s[cnt++]=i;
                if(i>b||n/i>b){
                    flag=1;
                }
            }
        }
        if(!flag){
            printf("Case %d: impossible\n",i);
        }else{
            printf("Case %d:",i);
            for(int i=0;ib){
                    printf(" %d",s[i]);
                }
            }
            if(n/s[cnt-1]==s[cnt-1]){
                cnt--;
            }
            for(int i=cnt-1;i>=0;i--){
                if(n/s[i]>b){
                    printf(" %d",n/s[i]);
                }
            }
            printf("\n");
        }
    }
    return 0;
}


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