Compilare: user.cpp: In function ‘void solve()’: user.cpp:76:26: warning: unused variable ‘m’ [-Wunused-variable] int li= 0,lf = N,m; ^ user.cpp: In function ‘void scanf(int&)’: user.cpp:16:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(;'0'>buffer[pointer]||buffer[pointer]>'9';next); ^ user.cpp:17:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(;'0'<=buffer[pointer]&&buffer[pointer]<='9';next) ^ user.cpp: In function ‘int main()’: user.cpp:96:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.in","r",stdin); ^ user.cpp:97:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.out","w",stdout); ^