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f5c973dfe7
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98d51273d9
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@ -1,32 +0,0 @@
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#include <stdio.h>
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main()
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{
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int c, i, nwhite, nother;
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int ndigit[10];
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nwhite = nother = 0;
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for (i = 0; i < 10; ++i)
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ndigit[i] = 0;
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while ((c = getchar()) != EOF)
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if (c >= '0' && c <= '9')
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++ndigit[c-'0'];
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else if (c == ' ' || c == '\t')
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++nwhite;
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else if (c == '\n')
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{
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++nwhite;
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printf("digits = ");
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for (i = 0; i < 10; ++i)
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printf(" %d", ndigit[i]);
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printf(", white space = %d, other = %d\n", nwhite, nother);
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}
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else
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++nother;
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printf("digits = ");
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for (i = 0; i < 10; ++i)
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printf(" %d", ndigit[i]);
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printf(", white space = %d, other = %d\n", nwhite, nother);
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}
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@ -1,8 +0,0 @@
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Important concepts
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Big O is a way to categorize your algorithms time or memory requirements based on input.
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- Growth is with respect to the input
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- Constants are dropped
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- Worst case is usually the way we measure
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@ -1,17 +0,0 @@
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array [0][]
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a + width * offset
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contigious memory
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```
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int a[3];
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[ jakdf ] [ adsfa ] [ vdsfv ]
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a[1] = 4;
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[ jakdf ] [ 4 ] [ vdsfv ]
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```
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O(1) operations, do not grow by input, we know all the positions and variables, so we just multiply
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@ -1,33 +0,0 @@
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#include <stdio.h>
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#define SIZE 55
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// Search complexity is O(n)
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// bc growths in respect to input, if array is 999
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// in the worst case the search will take 999 iterations over the loop
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// if array is 4, the worst case will take 4 loops
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int linear_search(int array[], int size, int value)
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{
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for (int i = 0; i < size; ++i)
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if (array[i] == value)
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return 1;
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return 0;
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}
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int main()
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{
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int array[SIZE];
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for (int i = 0; i < SIZE; ++i)
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array[i] = 0;
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array[3] = 45;
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int value = 45;
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int is_found = linear_search(array, SIZE, value);
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printf("1 if found: %d\n", is_found);
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is_found = linear_search(array, SIZE, 99);
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printf("1 if found: %d\n", is_found);
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}
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@ -1,44 +0,0 @@
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#include "stdio.h"
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#define SIZE 4096
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int binary_search(int array[], int size, int offset, int value)
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{
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int pivot = size / 2;
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int current_value = array[offset + pivot];
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printf("At %d\n", offset + pivot);
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if (current_value == value)
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{
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return 1;
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}
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if (pivot > 0)
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{
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if (current_value > value)
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return binary_search(array, pivot, offset, value);
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else
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return binary_search(array, pivot, offset + pivot, value);
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}
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return 0;
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}
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int main()
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{
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int array[SIZE];
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for (int i = 0; i < SIZE; ++i)
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array[i] = i;
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printf("1 if found: %d\n", binary_search(array, SIZE, 0, 5243));
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printf("1 if found: %d\n", binary_search(array, SIZE, 0, 1));
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printf("1 if found: %d\n", binary_search(array, SIZE, 0, 1044));
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// for (int i = 0; i < SIZE; ++i)
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// if (!binary_search(array, SIZE, 0, i))
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// printf("YOU FUCKED UP!!! at index %d\n", i);
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printf("1 if found: %d\n", binary_search(array, SIZE, 0, SIZE));
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array[14] = 13;
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printf("1 if found: %d\n", binary_search(array, SIZE, 0, 14));
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}
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