Compilare: user.cpp: In function ‘void solve()’: user.cpp:63:15: warning: unused variable ‘b’ [-Wunused-variable] long long n, b, w; ^ user.cpp: In function ‘void read()’: user.cpp:39:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld %lld", &x, &y); ^ user.cpp: In function ‘void solve()’: user.cpp:64:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld %lld", &n, &w); ^ user.cpp: In function ‘int main()’: user.cpp:104:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(file_out, "wt", stdout); ^ user.cpp:106:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld", &t); ^