c言語でクイックソート
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#include <stdio.h> #include <stdlib.h> #include <time.h> void dispArrayLine(int a[], int length, int dispTotal){ int total = 0; for(int i=0; i<length; i++){ total += a[i]; printf("%d", a[i]); if(i!=length-1){ printf(" "); }else{ if(dispTotal){ printf(" : %d", total); } printf("\n"); } } } void dispArrayList(int a[], int length){ for(int i=0; i<length; i++){ printf("[%d] : %d\n", i, a[i]); } } void resetArray(int a[], int length){ for(int i=0; i<length; i++){ a[i] = 0; } } void init(){ srand((unsigned)time(NULL)); } double getRandomDouble(){ return (double)rand() / RAND_MAX; } int getRandomInt(int min, int max){ double d = getRandomDouble(); int randomOffset = d * (max - min + 1); return min + randomOffset; } void setRandomIntForArray(int a[], int length, int min, int max){ for(int i=0; i<length; i++){ a[i] = getRandomInt(min, max); } } int getPivot(int a, int b, int c){ if(a > b){ if(b > c){ return b; }else{ return a > c ? c : a ; } }else{ if(a > c){ return a; }else{ return b > c ? c : b ; } } } int getMax(int a, int b, int c){ if(a > b){ return a > c ? a : c ; }else{ return b > c ? b : c ; } } int getMin(int a, int b, int c){ if(a < b){ return a < c ? a : c ; }else{ return b < c ? b : c ; } } void swap(int a[], int l, int r){ int t = a[l]; a[l] = a[r]; a[r] = t; } void quicksort_core(int a[], int length, int left, int right){ if(right <= left){ return; } int l = left; int r = right; int p = getPivot(a[l], a[l+1], a[r]); while(1){ while(a[l]<p){ l++; } while(p<a[r]){ r--; } if(r<=l){ break; } swap(a, l, r); l++; r--; } quicksort_core(a, length, left, l-1); quicksort_core(a, length, r+1, right); } void quicksort(int a[], int length){ int left = 0; int right = length-1; quicksort_core(a, length, left, right); } int main(void){ init(); int length = 30; int a[length]; int min = -9; int max = 9; setRandomIntForArray(a, length, min, max); dispArrayLine(a, length, 1); quicksort(a, length); dispArrayLine(a, length, 1); return 0; } |
