Compilare: main.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas] 3 | #pragma GCC optimization("O3") | main.cpp: In function 'int dfs(int, int)': main.cpp:20:1: warning: no return statement in function returning non-void [-Wreturn-type] 20 | } | ^ main.cpp: In function 'int main()': main.cpp:27:10: warning: 'col' may be used uninitialized in this function [-Wmaybe-uninitialized] 27 | char col; | ^~~ main.cpp:109:26: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] 109 | cout<<a<<" "<<b<<'\n'<<col; | ^~~ main.cpp:109:12: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] 109 | cout<<a<<" "<<b<<'\n'<<col; | ^~~