cpp/cs102/duplicate Source

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Description
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<p>Given an array of n integers, in which only one number in the array
has a duplicate, write a program to output the number that is duplicated.</p>

<p>If the user enters array values:</p>

<pre>
4 5 12 -3 1 12 6 7
</pre>

Output:

<pre>
12
</pre>

Epilogue
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shown when solved

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Remarks
Comments, history, license, etc.

Copied from problem cpp/cs102/practice4/apy (author: redekopp@usc.edu)
Copied from problem cpp/cin/average (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/in_n_days (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/char_arith (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/hello (author: daveagp@gmail.com)

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Engine
Choices
json list of string, bool pairs
e.g. [["good", true], ["bad", false]]

Correct answer
Template / Reference solution

Template / Reference solution

#include <iostream>
#include <cmath>
using namespace std;

int main() {
const int MAX = 40;
int data[MAX];
int n;
cin >> n;

// Read in n integers
for(int i=0; i < n; i++){
cin >> data[i];
}

\[
for(int i=0; i < n; i++){
for(int j = i+1; j < n; j++){
if(data[i] == data[j]){
cout << data[i] << endl;
}
}
}
]\

return 0;
}

Java test suite
See manual

C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]
to just run once with no input use [{}]

[
{"stdin":"8 4 5 12 -3 1 12 6 7", "args":[]},
{"stdin":"2 -3 -3", "args":[]}
]

C++ test suite
See manual

Forbidden substrings
json list of strings
e.g. ["for","while"]

remove
Solution visibility remove
Java imports
json list of importables
e.g. ["java.util.*"]

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Override Java classname
else defaults to
websheet name
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Dependent on other websheets?
json list of websheet names in this folder
e.g. ["DataStructure"]

remove
Is example?
i.e., just a demo
remove
Add compiler flag(s)
json list of flags
e.g. ["-Wno-unused-variable"]

remove
Remove default compiler flag(s)
json list of flags
see default_cppflags
e.g. ["-Wno-write-strings"]

remove

Property	Value
Description html markup shown to student	<p>Given an array of n integers, in which only one number in the array has a duplicate, write a program to output the number that is duplicated.</p> <p>If the user enters array values:</p> <pre> 4 5 12 -3 1 12 6 7 </pre> Output: <pre> 12 </pre>
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/cs102/practice4/apy (author: redekopp@usc.edu) Copied from problem cpp/cin/average (author: redekopp@usc.edu) Copied from problem cpp/var-expr/in_n_days (author: redekopp@usc.edu) Copied from problem cpp/var-expr/char_arith (author: redekopp@usc.edu) Copied from problem cpp/var-expr/hello (author: daveagp@gmail.com) remove
Engine
Choices json list of string, bool pairs e.g. `[["good", true], ["bad", false]]`
Correct answer
Template / Reference solution
Template / Reference solution	#include <iostream> #include <cmath> using namespace std; int main() { const int MAX = 40; int data[MAX]; int n; cin >> n; // Read in n integers for(int i=0; i < n; i++){ cin >> data[i]; } \[ for(int i=0; i < n; i++){ for(int j = i+1; j < n; j++){ if(data[i] == data[j]){ cout << data[i] << endl; } } } ]\ return 0; }
Java test suite See manual
C++ test suite json list of stdin/args tests e.g. `[{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]` to just run once with no input use `[{}]`	[ {"stdin":"8 4 5 12 -3 1 12 6 7", "args":[]}, {"stdin":"2 -3 -3", "args":[]} ]
C++ test suite See manual
Forbidden substrings json list of strings e.g. `["for","while"]`	remove
Solution visibility	remove
Java imports json list of importables e.g. `["java.util.*"]`	remove
Override Java classname else defaults to websheet name	remove
Dependent on other websheets? json list of websheet names in this folder e.g. `["DataStructure"]`	remove
Is example? i.e., just a demo	remove
Add compiler flag(s) json list of flags e.g. `["-Wno-unused-variable"]`	remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. `["-Wno-write-strings"]`	remove

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