SystemVerilog Testbench Introduction

SystemVerilog Testbench Architecture

APB Interface

APB Transaction

APB Generator

APB Driver

APB Driver Phase 2

APB Monitor

APB Scoreboard

APB Environment

APB Testbench Top

RISC-V Processor (YARP) Interface

YARP Transaction

YARP Generator

YARP Driver

YARP Data Memory Model

YARP Monitor

YARP Scoreboard

YARP Testbench Top

DVCon 26 Hackathon Problem

Array Sum Limit

Array Index Sum Limit

Ball Draw No Repeat

Conditional Even Probability

Even Odd Index Value

Five Consecutive Ones

Frequency Constraint

Grouped Ones

Index Value Range

Leap Year

Matrix Rotation

Non Adjacent Ones

Power of 4

Dynamic Ranges

Recent Four Unique

Row Max Unique

Subarray Max Sum

Three Duplicates Only

Tic Tac Toe

Unique 3D Array

Weighted Popcount

Unique Sum

Split Array into Queues

# Three Duplicates Only

## Problem Statement

Given an array of 5 elements, exactly one value must appear exactly 3 times, and all other distinct values must appear exactly 1 time.

For a valid array:
- Choose one value that appears 3 times
- The remaining 2 elements must each have unique values (different from each other and from the repeated value)

## Constraints
- Array size: 5 elements
- Element type: byte (0-255)
- Pattern: One value appears exactly 3 times, two other values appear exactly 1 time each
- Total distinct values: 3 (one appearing 3 times, two appearing 1 time each)

## Examples

### Example 1:
```
[5, 5, 5, 3, 7]
Valid
Explanation:
- Value 5 appears 3 times ✓
- Value 3 appears 1 time ✓
- Value 7 appears 1 time ✓
- All constraints satisfied
```

### Example 2:
```
[1, 2, 1, 3, 1]
Valid
Explanation:
- Value 1 appears 3 times (indices 0, 2, 4) ✓
- Value 2 appears 1 time ✓
- Value 3 appears 1 time ✓
```

### Example 3:
```
[10, 10, 10, 10, 5]
Invalid
Explanation: Value 10 appears 4 times, should be exactly 3
```

### Example 4:
```
[2, 2, 2, 3, 3]
Invalid
Explanation: Value 2 appears 3 times ✓, but value 3 appears 2 times (should be 1)
```

### Example 5:
```
[7, 7, 8, 9, 7]
Valid
Explanation:
- Value 7 appears 3 times (indices 0, 1, 4) ✓
- Value 8 appears 1 time ✓
- Value 9 appears 1 time ✓
```

### Example 6:
```
[0, 0, 0, 0, 0]
Invalid
Explanation: All elements are the same; duplicated value appears 5 times, not 3
```
