Missing Number

Problem Statement

Input Format

First line contains N. Second line contains N-1 space-separated integers.

Output Format

Print the missing number.

Constraints

2 <= N <= 1000

Sample Input

5
1 2 4 5

Sample Output

3

Explanation

Expected sum of 1 to 5 is 15. Actual sum is 12. Missing number is 15 - 12 = 3.

Starter Code

#include <stdio.h>

int main() {
    int n;
    if (scanf("%d", &n) == 1) {
        int sum = 0;
        for (int i = 0; i < n - 1; i++) {
            int val;
            scanf("%d", &val);
            sum += val;
        }
        // Write your code here
    }
    return 0;
}

Limits

• Time Limit: 1s
• Memory Limit: 256MB