Compilare: main.cpp: In function 'int main()': main.cpp:37:23: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] mat[1][m]=NULL; ^~~~ main.cpp:108:27: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] mat[1][m]=NULL; ^~~~ main.cpp:109:27: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] mat[2][m]=NULL; ^~~~ main.cpp:93:49: warning: 'goc' may be used uninitialized in this function [-Wmaybe-uninitialized] if(gol>-1){mat[gol][goc]='@'; num++;} ~~~~~~~~~~~~~^~~~