Problem:
Score : 100 points

Problem Statement

There is an N-car train.

You are given an integer i. Find the value of j such that the following statement is true: "the i-th car from the front of the train is the j-th car from the back."

Constraints

1 \leq N \leq 100

1 \leq i \leq N

Input

Input is given from Standard Input in the following format:

N i

Output

Print the answer.

Sample Input 1

4 2

Sample Output 1

3

The second car from the front of a 4-car train is the third car from the back.

Sample Input 2

1 1

Sample Output 2

1

Sample Input 3

15 11

Sample Output 3

5

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>

main(){
    int n,k;
    scanf("%d%d",&n,&k);
    int x[n],grp[n],flg=0;

    for (int i = 0; i < n; ++i) {
        scanf("%d",&x[i]);
    }

    for (int i = 0; i < n-k+1; ++i) {
        if(x[i]<0 && 0<x[i+k-1]){
            grp[i]=-x[i]+x[i+k-1]+(-x[i]<x[i+k-1]?-x[i]:x[i+k-1]);
        } else if(x[i]<0){
            grp[i]=-x[i];
        } else
            grp[i]=x[i+k-1];
    }

    int min=grp[0];
    for (int i = 0; i < n - k + 1; ++i) {
        min=(min>grp[i]?grp[i]:min);
    }
    printf("%d",min);
}