sorting

问题 Ok so this is not a homework question obviously, but here is the thing: The bubble sort algorithm is said to be O(n^2), Ω(n). However, if we plot its time complexity as a graph (average case), and try to lower bound it, a more accurate lower bound would be Ω(n^2). However contextually we see that Ω(n) is correct. So why does lower bounding the algorithm's runtime does not work? 回答1: I think you're mixing up concepts: Lower bound vs upper bound: Ω(f(n)) is a lower bound, and O(f(n)) is an

问题 #include <stdio.h> int main() { int N, i, j, k, z, v, x, c; printf("Determine the number of your words: \n"); scanf("%d", &N); char dict[50][50]; char tmp[50]; for(i=0; i<N; i++) { printf("Determine your %d. word: \n", i+1); scanf("%49s", &dict[i]); } for(j=0; N-1; j++) { for(k=0; N-i; j++) { if(dict[k][0]>dict[k+1][0]) { for(z=0; z<50; z++) { tmp[z]=dict[k][z]; } for(v=0; v<50; v++) { dict[k][v] = dict[k+1][v]; } for(x=0; x<50; x++) { dict[k][x]=tmp[x]; } } } } for(c=0; c<N; c++) { printf("

问题 An ascending sort callback function for qsort and bsearch on an array of int could look like this: int ascending(const void *o1, const void *o2) { int a = *(const int *)o1; int b = *(const int *)o2; return a < b ? -1 : 1; } Yet this function seems to violate the constraint on the compar function as specified in the C Standard: 7.22.5.2 The qsort function Synopsis #include <stdlib.h> void qsort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); Description The

问题 An ascending sort callback function for qsort and bsearch on an array of int could look like this: int ascending(const void *o1, const void *o2) { int a = *(const int *)o1; int b = *(const int *)o2; return a < b ? -1 : 1; } Yet this function seems to violate the constraint on the compar function as specified in the C Standard: 7.22.5.2 The qsort function Synopsis #include <stdlib.h> void qsort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); Description The

问题 An ascending sort callback function for qsort and bsearch on an array of int could look like this: int ascending(const void *o1, const void *o2) { int a = *(const int *)o1; int b = *(const int *)o2; return a < b ? -1 : 1; } Yet this function seems to violate the constraint on the compar function as specified in the C Standard: 7.22.5.2 The qsort function Synopsis #include <stdlib.h> void qsort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); Description The

问题 An ascending sort callback function for qsort and bsearch on an array of int could look like this: int ascending(const void *o1, const void *o2) { int a = *(const int *)o1; int b = *(const int *)o2; return a < b ? -1 : 1; } Yet this function seems to violate the constraint on the compar function as specified in the C Standard: 7.22.5.2 The qsort function Synopsis #include <stdlib.h> void qsort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); Description The

问题 An ascending sort callback function for qsort and bsearch on an array of int could look like this: int ascending(const void *o1, const void *o2) { int a = *(const int *)o1; int b = *(const int *)o2; return a < b ? -1 : 1; } Yet this function seems to violate the constraint on the compar function as specified in the C Standard: 7.22.5.2 The qsort function Synopsis #include <stdlib.h> void qsort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); Description The

问题 How can we write code to permute an array to the order of selection in the Josephus problem? Given a sequence of items (such as an array of char * ) and a skip distance d , we skip d items from the start, take that item to be the first in the output sequence, then skip d further items, take the resulting item to be the second in the output, and continue in this way. When we reach the end of the sequence, we wrap to the beginning, continuing to count. Only items remaining in the array are

问题 Very similair to this question: Sort table rows based on their Class Names Consider the following table: <table> <thead> <th>A column</th> </thead> <tbody> <tr> <td class="x">A</td> </tr> <tr> <td class="c">B</td> </tr> <tr> <td class="">C</td> </tr> </tbody> </table> I would like to sort rows based on the first (in this case only) column class name. Some td don't have a class specified. So the desired effect would be: A-B-C -> C-B-A or B-A-C (I don't care where the classless tds are placed).

问题 Very similair to this question: Sort table rows based on their Class Names Consider the following table: <table> <thead> <th>A column</th> </thead> <tbody> <tr> <td class="x">A</td> </tr> <tr> <td class="c">B</td> </tr> <tr> <td class="">C</td> </tr> </tbody> </table> I would like to sort rows based on the first (in this case only) column class name. Some td don't have a class specified. So the desired effect would be: A-B-C -> C-B-A or B-A-C (I don't care where the classless tds are placed).