A. Add Odd or Subtract Even

题目

AC代码

#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <set>
#include <cmath>
using namespace std;
typedef unsigned long long ll;

ll T;
ll a,b;
int main(){
    cin>>T;
    while(T--){
        scanf("%lld %lld",&a,&b);
        if(a == b) puts("0");
        else if(a<b){
            if(a%2 ^ b%2) puts("1");
            else puts("2");
        }else{
            if(a%2 ^ b%2) puts("2");
            else puts("1");
        }
    }
    return 0;
}