Exercises from list 6, 7 & partially 8

src/cw6/zad12/slowa.cpp

@@ -0,0 +1,56 @@
+#define STOP_SYNTAX 'c'
+
+#include <iostream>
+#include <queue>
+
+using namespace std;
+
+int slowa(string s)
+{
+    queue<char> q, k;
+    // fill q with default data
+    q.push('a');
+    q.push(STOP_SYNTAX);
+    q.push('b');
+    q.push(STOP_SYNTAX);
+    int count = 1;
+    bool wasB = false;
+
+    for (int i = 0; s[i]; i++)
+    {
+        if (s[i] == 'b' && !wasB)
+            wasB = true;
+
+        // do we encounter next fib letter
+        if (s[i] == q.front())
+        {
+            k.push(s[i]);
+            q.pop();
+
+            // if it was not last letter of word
+            if (q.front() == STOP_SYNTAX)
+            {
+                ++count;
+                k.push(STOP_SYNTAX);
+                // copy finished word to make queue for next one
+                while (k.front() != STOP_SYNTAX)
+                {
+                    q.push(k.front());
+                    k.push(k.front());
+                    k.pop();
+                }
+            }
+        }
+    }
+
+    // free q,k but i cannot do it
+    if (wasB)
+        return count;
+    return 0;
+}
+
+int main()
+{
+    string slowo = "abccxabbbaaxccbbba" + 0;
+    cout << slowa(slowo) << endl;
+}

src/cw6/zad3/zad3_ms.cpp

@@ -0,0 +1,93 @@
+#include <iostream>
+#include <stack>
+
+using namespace std;
+
+bool is_ice(int layer)
+{
+    return layer < 0;
+}
+
+void stack_layer(stack<int> *layers, int layer, bool isIce)
+{
+    if (isIce)
+    {
+        layers->push(-abs(layer));
+    }
+    else
+    {
+        if (!layers->empty())
+            layers->push(abs(layer));
+    }
+}
+
+void put_on_stack(stack<int> *layers, int layer)
+{
+    if (layers->empty())
+    {
+        stack_layer(layers, layer, is_ice(layer));
+        return;
+    }
+
+    int sameType = 0, otherType = 0;
+    while (otherType < abs(layer) && !layers->empty())
+    {
+        int topLayer = layers->top();
+        if (is_ice(layer) != is_ice(topLayer))
+        {
+            otherType += abs(topLayer);
+        }
+        else
+        {
+            sameType += topLayer;
+        }
+        layers->pop();
+    }
+
+    if (otherType < abs(layer))
+    {
+        put_on_stack(layers, layer);
+        return;
+    }
+
+    int remainingLayerOfOtherType = otherType - abs(layer);
+    stack_layer(layers, remainingLayerOfOtherType, !is_ice(layer));
+    stack_layer(layers, sameType+layer, is_ice(layer));
+}
+
+int sadzawka(int size, int arr[])
+{
+    stack<int> layers;
+    for (int i = 0; i < size; i++)
+    {
+        put_on_stack(&layers, arr[i]);
+    }
+
+    // copy results
+    int resultsCount = (int)layers.size();
+    for (int i = 0; i < resultsCount; i++)
+    {
+        arr[i] = layers.top();
+        layers.pop();
+    }
+    return resultsCount;
+}
+
+int main()
+{
+    int size;
+    cin >> size;
+    int *arr = (int *)malloc((size_t)size * sizeof(int));
+    for (int i = 0; i < size; i++)
+    {
+        cin >> arr[i];
+    }
+
+    int results = sadzawka(size, arr);
+    for (int i = 0; i < results; i++)
+    {
+        cout << arr[i] << endl;
+    }
+
+    free(arr);
+}

src/cw6/zad5/wtc_ms.cpp

@@ -0,0 +1,62 @@
+#define NOTHING_HERE -1
+
+#include <iostream>
+#include <stack>
+
+using namespace std;
+
+/*
+5    #
+4  # #
+3  ####
+2 ######
+1 #######
+i 1234567
+k 1214111
+*/
+
+/// @brief
+/// @param arr array with towers [1..n]
+/// @param size elements count n
+/// @param results  array [1..n] with k's, when arr[i] = max(arr[i-results[i]+1], ... arr[i])
+/// @return
+int *katastrofa(int *arr, int size)
+{
+    stack<int> indexes;
+    // if all towers are lower than current, when
+    indexes.push(NOTHING_HERE);
+
+    int *results = (int *)malloc((size_t)(size + 1) * sizeof(int));
+    for (int i = 1; i <= size; i++)
+    {
+        // remove all lower / same towers, because there are irrelevants
+        while (indexes.top() != NOTHING_HERE && arr[indexes.top()] <= arr[i])
+            indexes.pop();
+        // because indexes.top() is the index of first higher than arr[i] tower
+        // if arr[i] is the highest yet then
+        if (indexes.top() == NOTHING_HERE)
+            results[i] = i;
+        else
+            results[i] = i - indexes.top();
+        // add current tower
+        indexes.push(i);
+    }
+    return results;
+}
+
+int main()
+{
+    int n;
+    cin>>n;
+    int* arr = (int*)malloc((size_t)(n+1)*sizeof(int));
+    for(int i = 1; i<=n; i++){
+        cin>>arr[i];
+    }
+    int* results = katastrofa(arr,n);
+    for(int i = 1; i<=n; i++){
+        cout<<results[i]<<endl;
+    }
+
+    free(arr);
+    free(results);
+}

src/cw6/zad7/manhatan_ms.cpp

@@ -0,0 +1,71 @@
+#include <iostream>
+#include <stack>
+
+using namespace std;
+
+int best_area(stack<int> *towers, int arr[], int currentTower, int i)
+{
+    int max = 0;
+    while (!towers->empty() && arr[towers->top()] > currentTower)
+    {
+        int width = (i-1) - towers->top() + 1;
+        int area = width * arr[towers->top()];
+        if (area > max)
+        {
+            max = area;
+        }
+        towers->pop();
+    }
+    return max;
+}
+
+int prostokat(int n, int arr[])
+{
+    if (n <= 0)
+        return 0;
+    stack<int> towers;
+    towers.push(0);
+    int max = 0;
+    for (int i = 1; i < n; i++)
+    {
+        int currArea = best_area(&towers, arr, arr[i], i);
+        if (currArea > max)
+            max = currArea;
+        towers.push(i);
+    }
+    return max;
+}
+
+int prostokat_brut(int n, int arr[])
+{
+    int max = 0;
+    for (int i = 0; i < n; i++)
+    {
+        int currMin = arr[i];
+        for (int j = i; j < n; j++)
+        {
+            if (currMin > arr[j])
+                currMin = arr[j];
+
+            int currArea = (j-i+1) * currMin;
+            if(currArea > max)
+            max=currArea;
+        }
+    }
+    return max;
+}
+
+int main()
+{
+    int n;
+    cin >> n;
+    int *arr = (int *)malloc((size_t)n * sizeof(int));
+    for (int i = 0; i < n; i++)
+    {
+        cin >> arr[i];
+    }
+    int bestArea = prostokat(n, arr);
+    cout << bestArea << endl;
+
+    free(arr);
+}

src/cw6/zad9/zad9_ms.cpp

@@ -0,0 +1,94 @@
+#include <iostream>
+#include <stack>
+
+// let: results fit in arr
+void inc(int n, bool arr[])
+{
+    if (n <= 0)
+        return;
+
+    int j;
+    if (arr[0])
+    {
+        arr[0] = false;
+        arr[1] = true;
+
+        // double 1 can be at arr[1] arr[2]
+        j = 2;
+    }
+    else{
+        arr[0] = true;
+        // double 1 can be at arr[0] arr[1]
+        j = 1;
+
+    }
+
+    while (j < n && arr[j - 1] && arr[j])
+    {
+        // if there are two 1 side by side, then represent them as 1 on arr[j+1]
+        arr[j + 1] = true;
+        arr[j - 1] = false;
+        arr[j] = false;
+
+        j+=2;
+    }
+}
+
+int fib(int n)
+{
+    if (n == 0)
+        return 1;
+    if (n == 2)
+        return 2;
+    return fib(n - 2) + fib(n - 1);
+}
+
+// int to_dec_from_zeckendorf(int n, bool arr[])
+// {
+//     int decValue = 0;
+//     for (int i = 0; i < n; i++)
+//     {
+//         if (arr[i])
+//             decValue += fib(i);
+//     }
+//     return decValue;
+// }
+
+int scan_bool(bool *results)
+{
+    int input;
+    int response = scanf("%d", &input);
+    if (response)
+    {
+        *results = (bool)input;
+    }
+    return response;
+}
+
+int main()
+{
+    int n;
+    if (!scanf("%d", &n))
+    {
+        printf("wrong n");
+        return -1;
+    }
+
+    bool *arr = (bool *)malloc((size_t)n * sizeof(bool));
+    for (int i = 0; i < n; i++)
+    {
+        if (!scan_bool(&arr[i]))
+        {
+            printf("wrong bool");
+            i--;
+        }
+    }
+
+    inc(n, arr);
+    for (int i = 0; i < n; i++)
+    {
+        printf("%d\n", (int)arr[i]);
+    }
+
+    free(arr);
+}