Compilare: main.cpp: In function 'int main()': main.cpp:19:19: warning: NULL used in arithmetic [-Wpointer-arith] while(s[i] != NULL) ^~~~ main.cpp:36:23: warning: NULL used in arithmetic [-Wpointer-arith] while(s[j] != NULL) ^~~~ main.cpp:57:39: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] p[++litere] = NULL; ^~~~ main.cpp:68:31: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] p[++litere] = NULL; ^~~~ main.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q = 0; q < cuv.size(); q ++) ~~^~~~~~~~~~~~ main.cpp:78:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cuv[q].size(); i ++) ~~^~~~~~~~~~~~~~~