Compilare: main.cpp: In function 'void add(nod*, int, int, int)': main.cpp:23:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos==word.size()) ~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<word.size();j++) ~^~~~~~~~~~~~ main.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<word.size() && ans>0;j++) ~^~~~~~~~~~~~