# Student Study Manager
# Class 11 Python Project
# Easy Version + 2 Extra Features

students = []   # List of students
records = []    # List of study records

while True:
    print("\n===== Student Study Manager =====")
    print("1. Add Student")
    print("2. Add Study Record")
    print("3. View Study Records")
    print("4. Count Subjects Studied")
    print("5. Total Study Time per Student")
    print("6. Strength & Weakness per Student")
    print("7. Exit")

    choice = input("Enter your choice (1-7): ")

    # 1. Add Student
    if choice == "1":
        name = input("Enter student name: ")
        roll = input("Enter roll number: ")
        student = {"name": name, "roll": roll}
        students.append(student)
        print("Student added!")

    # 2. Add Study Record
    elif choice == "2":
        if not students:
            print("Add student first!")
        else:
            roll = input("Enter student roll number: ")
            subject = input("Enter subject name: ")
            time = float(input("Enter time studied (hours): "))
            record = {"roll": roll, "subject": subject, "time": time}
            records.append(record)
            print("Study record added!")

    # 3. View Study Records
    elif choice == "3":
        if not records:
            print("No study records found.")
        else:
            print("\n--- Study Records ---")
            for r in records:
                print("Roll:", r["roll"], "| Subject:", r["subject"], "| Time:", r["time"], "hours")

    # 4. Count Subjects Studied
    elif choice == "4":
        print("Total study records:", len(records))

    # 5. Total Study Time per Student
    elif choice == "5":
        if not records:
            print("No study records found.")
        else:
            print("\n--- Total Study Time per Student ---")
            for s in students:
                total_time = 0
                for r in records:
                    if r["roll"] == s["roll"]:
                        total_time += r["time"]
                print(f"{s['name']} (Roll: {s['roll']}) → {total_time} hours")

    # 6. Strength & Weakness per Student
    elif choice == "6":
        if not records:
            print("No study records found.")
        else:
            print("\n--- Strength & Weakness per Student ---")
            for s in students:
                sub_time = {}
                for r in records:
                    if r["roll"] == s["roll"]:
                        sub_time[r["subject"]] = r["time"]
                if not sub_time:
                    continue
                avg_time = sum(sub_time.values()) / len(sub_time)
                print(f"\n{s['name']} (Roll: {s['roll']})")
                for sub, t in sub_time.items():
                    if t >= avg_time:
                        print(sub, "→ Strength")
                    else:
                        print(sub, "→ Weakness")

    # 7. Exit
    elif choice == "7":
        print("Thank you for using Student Study Manager!")
        break

    else:
        print("Invalid choice! Try again.")