Compilare: user.cpp: In function ‘int main()’: user.cpp:10:15: warning: unused variable ‘j’ [-Wunused-variable] int t, i, j, k, a, b; ^ user.cpp:10:18: warning: unused variable ‘k’ [-Wunused-variable] int t, i, j, k, a, b; ^ user.cpp:10:24: warning: unused variable ‘b’ [-Wunused-variable] int t, i, j, k, a, b; ^ user.cpp:13:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( IN, "%d", &t ); ^ user.cpp:17:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN, "%lld", &n ); ^