Compilare: user.cpp: In function ‘void solve()’: user.cpp:111:9: warning: unused variable ‘i’ [-Wunused-variable] int i, x = a; ^ user.cpp: In function ‘void readFile()’: user.cpp:73:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &nr); ^ user.cpp:83:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &nr); ^