Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:73:13: warning: no return statement in function returning non-void [-Wreturn-type] dr[nod]=++u;} ^ main.cpp: In function 'int update(int, int)': main.cpp:77:13: warning: no return statement in function returning non-void [-Wreturn-type] aib[i]+=val;} ^ main.cpp: In function 'int main()': main.cpp:85:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pandemie.out","w",stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:17:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^