规律题，这规律无力吐槽了…
1 /************************************************************** 2 Problem: 1432 3 User: zhuohan123 4 Language: C++ 5 Result: Accepted 6 Time:0 ms 7 Memory:804 kb 8 ****************************************************************/ 9 10 #include <cstdio> 11 using namespace std; 12 inline int imin(int a,int b){return a<b?a:b;} 13 int main(int argc, char *argv[]) 14 { 15 int n,k;scanf("%d%d",&n,&k); 16 printf("%d ",n==1?1:2*imin(k,n-k+1)); 17 return 0; 18 }