Compilare: main.cpp: In function 'int main()': main.cpp:128:22: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] 128 | cop1[l1]=NULL; | ^~~~ main.cpp:108:19: warning: iteration 60 invokes undefined behavior [-Waggressive-loop-optimizations] 108 | if(f[j]!=0) | ~~~^ main.cpp:107:22: note: within this loop 107 | for(int j=0;j<=60;j++) | ~^~~~