234A - Lefthanders and Righthanders - CodeForces Solution

if __name__ == "__main__":
        
    f = open("input.txt", "r")
    n = int(f.readline())
    students = list(f.readline())

    f = open("output.txt", "w")
    for i in range(int(n/2)):

        if i + int(n/2) <= n:
            a = students[i]
            b = students[i + int(n/2)]
            arr = [[i + 1, a], [i + int(n/2) + 1, b]]
            arr.sort(key=lambda x: x[1])
                        print(arr[0][0], arr[1][0], file=f)
        else:
            a = students[i]
            b = students[i - int(n/2)]
            arr = [[i + 1, a], [i - int(n/2) - 1, b]]
            arr.sort(key=lambda x: x[1])
                        print(arr[0][0], arr[1][0], file=f)