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Table 3 Problem id, name, and difficulty of Programming Task of AOJ (all problems are from http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?lang=en? id=ProblemID)

From: Student placement and skill ranking predictors for programming classes using class attitude, psychological scales, and code metrics

Problem ID

Problem name

Difficulty level

10000

Hello World

1

10001

X Cubic

1

10002

Rectangle

1

10009

Circle

2

10010

Simple Calculator

3

10003

Small Large or Equal

1

10004

Sorting Three Numbers

1

10005

Print Many Hello World

1

10006

Print Test Cases

1

10012

Print Rectangle

1

10013

Print a Frame

2

10016

Grading

2

10019

Sum of Numbers

2

10017

How many ways?

3

10021

Finding minimum String

3

10028

Sort I

3

0121

Seven Puzzle

4

0030

Sum of Integers

4

10014

Print a Chessboard

1

ITP1_5_D

Structured Program I

1

10023

Shuffle

2

10020

Counting Characters

2

1129

HanafudaShuffle

3

10031

Search II

3

1160

How Many Islands?

4

10026

Standard Deviation

1

10020

Counting Characters

1

0011

Drawing Lots

1

1147

ICPC Score Totalizer Software

2

1129

Hanafuda Shuffle

2

2102

Rummy

3

1173

The Balance of the World

3

1166

Amazing Mazes

3

1144

Curling 2.0

4

1133

Water Tank

4

1302

Twenty Questions

4