HDU 6124 17多校7 Euler theorem（简单思维题）

Posted 2020-10-03 Annetree的博客

Problem Description

HazelFan is given two positive integers a,b， and he wants to calculate amodb. But now he forgets the value of b and only remember the value of a, please tell him the number of different possible results.

 

 

Input

The first line contains a positive integer T(1≤T≤5), denoting the number of test cases.
For each test case:
A single line contains a positive integer a(1≤a≤109).

 

 

Output

For each test case:
A single line contains a nonnegative integer, denoting the answer.

 

 

Sample Input

2

1

3

 

 

 

Sample Output

2

3

 

题意：有两个正整数a,b。a已知，b未知,求a mod b有几种情况

题解：手算几个即可发现规律。以7为例，有如下5种情况 7(b>7),1(b==6||b==3||b==2),2(b==5),3(b==4),0(b==1||b==7);

 

 1 #include<iostream>
 2 #include<cstdio>
 3 using namespace std;
 4 
 5 int T;
 6 long long a;
 7 int main()
 8 {
 9     scanf("%d",&T);
10     while(T--)
11     {
12         scanf("%lld",&a);
13         printf("%lld\n",(a+1)/2+1);
14     }
15     return 0;
16 }