Compilare: user.c: In function ‘QuickSort’: user.c:39:1: warning: implicit declaration of function ‘swap’ [-Wimplicit-function-declaration] swap(v,left,(left+right)/2); ^ user.c: At top level: user.c:52:6: warning: conflicting types for ‘swap’ [enabled by default] void swap(int v[],int i,int j){ ^ user.c:39:1: note: previous implicit declaration of ‘swap’ was here swap(v,left,(left+right)/2); ^ user.c: In function ‘main’: user.c:83:5: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(operand, 0, 20 * sizeof(int)); ^ user.c:83:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:69:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^ user.c:72:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &A[i]); ^ user.c:75:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &B[i]); ^