Compilare: user.c: In function ‘main’: user.c:51:5: warning: implicit declaration of function ‘memcpy’ [-Wimplicit-function-declaration] memcpy(copyOfVector, vector, N * sizeof(long long)); ^ user.c:51:5: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default] user.c:41:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &N); ^ user.c:42:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &M); ^ user.c:45:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &vector[i]); ^ user.c:49:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &left); ^ user.c:50:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &right); ^