Compilare: user.cpp:14:19: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define maxDim (1 << 20 + 1) ^ user.cpp:47:10: note: in expansion of macro ‘maxDim’ int vals[maxDim]; ^ user.cpp: In function ‘int main()’: user.cpp:83:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bile3.in","r",stdin); ^ user.cpp:86:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp: In constructor ‘Buffer::Buffer(std::string, int)’: user.cpp:19:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(name.c_str(), "w", stdout); ^