Test Bank - Data Structures & Algorithm Analysis in C++ 4th Edition by Mark Weiss, Chapter 1-12

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Test Bank for Data Structures & Algorithm
Analysis in C++ 4th Edition by Mark Weiss
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All Chapters Included (1-12)
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♦️♦️♦️INSTANT DOWNLOAD
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♦️♦️♦️COMPLETE ANSWERS
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CHAPTER 1


Introduction
1.1
/*
Exercise 1.1 All Chapters Included
Selection of integers with k = N/2
select1 => sorting and selecting
select2 => keeping top k
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*/ All Answers Included
#include <iostream>
#include <ctime>
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#include <cmath>
#include <vector>
#include <algorithm>
using namespace std;
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void sort(vector<int> & vec)
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{ // bubble sort ascending
bool sorted = false;
while (!sorted)
{
sorted = true;
for (auto i = 1; i < vec.size(); i++)
{
if (vec[i-1]> vec[i])
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{
swap(vec[i],vec[i-1]);
sorted = false;
}
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}
}
}
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void sortDec(vector<int> & vec)
{ // bubble sort descending
bool sorted = false;
while (!sorted)
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{
sorted = true;
for (auto i = 1; i < vec.size(); i++)
{
if (vec[i-1]< vec[i])
{
swap(vec[i],vec[i-1]);
sorted = false;
}
}
}
}




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int select1(vector<int> nums)
{
int k = (nums.size()+1)/2;
sort(nums);
return nums[k];
}


int select2(const vector<int> &nums)
{
int k = nums.size()/2;
vector<int> topK(nums.begin(), nums.begin() + k);
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sortDec(topK);
for (auto i = k; i < nums.size(); i++)
{
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if (nums[i] > topK[k-1])
{
for (auto j = k-2; j >=0 ; j--)
if (nums[i] < topK[j])
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{topK[j+1] = nums[i]; break;}
else
topK[j+1] = topK[j];
if (topK[0] < nums[i])
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topK[0] = nums[i];
}
}
return topK[k-1];
}

int main()
{
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vector<int> nums;
int selected;
time_t start, end;
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srand(time(NULL));
for (auto numInts = 1000; numInts<=10000; numInts+=1000)
// sizes 1,000, 2,000, 3,000, ...10,000
{
nums.resize(numInts);
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start = time(NULL);
for (auto i = 0; i < 10; i++) // run 10 times
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{
for (auto j = 0; j < numInts; j++)
nums[j] = rand()%(2*numInts);
selected = select1(nums); // or selected = select2(nums);
}
end = time(NULL);
cout<<numInts<<"\t"<<difftime(end,start)<<endl;
}
return 0;
}




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180
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Time of Select1
80 Time of Select2
60
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0
0 2000 4000 6000 8000 10000 12000

2. /*
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Word Puzzle problem
from the example in figure 1.1
*/
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#include<iostream>
#include<fstream>
#include<string>
#include<vector>
#include "matrix.h"
#include<algorithm>

using namespace std;
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const int MAXROWS = 4;
const int MAXCOLS = 4;
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struct Orientation
{
Orientation() : delRow(0), delCol(0) {}
Orientation operator() (int direction)
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{
switch (direction)
{
case 0 : delRow = -1; delCol = -1; break;
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case 1 : delRow = -1; delCol = 0; break;
case 2 : delRow = -1; delCol = 1; break;
case 3 : delRow = 0; delCol = -1; break;
case 4 : delRow = 0; delCol = 1; break;
case 5 : delRow = 1; delCol = -1; break;
case 6 : delRow = 1; delCol = 0; break;
case 7 : delRow = 1; delCol = 1; break;
}
return *this;
}
int delRow;
int delCol;




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