CodeForces - 1194A ： Remove a Progression

 

题目链接：https://vjudge.net/problem/CodeForces-1194A
　　往后发现每回都只有偶数被留下来，而且第n个数就是2*n

#include<set>
#include<map>
#include<stack>
#include<queue>
#include<cmath>
#include<cstdio>
#include<cctype>
#include<string>
#include<vector>
#include<climits>
#include<cstring>
#include<cstdlib>
#include<iostream>
#include<algorithm>
#define max(a, b) (a > b ? a : b)
#define min(a, b) (a < b ? a : b)
#define mst(a) memset(a, 0, sizeof(a))
#define _test printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n")
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const double eps = 1e-7;
const int INF = 0x3f3f3f3f;
const ll ll_INF = 233333333333333;
const int maxn = 1e3 + 10;
int main(void) {
    int t;
    scanf("%d", &t);
    while(t--) {
        ll n, k;
        scanf("%lld%lld", &n, &k);
        printf("%lld\n", 2*k);
    }
    return 0;
}