Compilare: main.cpp: In function 'int main()': main.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(a[i])<minim) ~~~~~~~~~~~~^~~~~~ main.cpp:40:22: warning: unused variable 'x' [-Wunused-variable] char x[10005]; ^ main.cpp:61:44: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] sirmin2[strlen(sirmin2)-1]=NULL; ^~~~ main.cpp:77:38: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] sirmin[strlen(sirmin)-1]=NULL; ^~~~