Codeforces Round 993A Easy Problem

https://codeforces.com/contest/2044/problem/A

修改地址2044就可以了。

思路很简单，每次-1

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main()
{
	int t = 0,n=0,c1=0;
	cin >> t;
	int a = 0, b = 0;
	while (t--)
	{
		cin >> n;
		c1 = 0;
		for (int i = n-1; i >0; i--)
		{
			a = i - 1;
			b = n - a;
			c1++;
		}
		cout << c1 << endl;
		c1 = 0;
	}
	return 0;
}

/*
Cube is given an integer N.
She wants to know how many ordered pairs of positive integers(a,b),
there are such that a=n-b.
Since Cube is not very good at math,
please help her!


Input
The first line contains an integer t(1≤t≤99) — the number of test cases.

The only line of each test case contains an integer n(2≤n≤100).

Output
For each test case, output the number of ordered pairs (a,b)
on a new line.

Example
Input
3
2
4
6
Output
1
3
5
*/

第二种方法，也是可以，都是AC

#include <iostream>
#include <string>
#include <vector>
using namespace std;
 
int main()
{
	int t = 0,n=0;
	cin >> t;
	int a = 0, b = 0;
	while (t--)
	{
		cin >> n;
		cout << n - 1<<endl;
	}
	return 0;
}