Compilare: user.c: In function ‘QuickSort’: user.c:17:1: warning: implicit declaration of function ‘swap’ [-Wimplicit-function-declaration] swap(v,left,(left+right)/2); ^ user.c: At top level: user.c:30:6: warning: conflicting types for ‘swap’ [enabled by default] void swap(int v[],int i,int j){ ^ user.c:17:1: note: previous implicit declaration of ‘swap’ was here swap(v,left,(left+right)/2); ^ user.c: In function ‘main’: user.c:48:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^ user.c:51:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &A[i]); ^ user.c:54:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &B[i]); ^