Compilare: user.cpp: In function ‘void read()’: user.cpp:27:24: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long long int*’ [-Wformat=] fscanf(in, "%d", &n); ^ user.cpp:29:33: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long long int*’ [-Wformat=] fscanf(in, "%d", &arr[i]); ^ user.cpp: In function ‘void print()’: user.cpp:60:33: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(out, "%d", mat[1][n]); ^ user.cpp: In function ‘void read()’: user.cpp:27:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:29:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &arr[i]); ^