Compilare: main.cpp: In function 'int main()': main.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<tree[tree[x][i]].size();++i) ~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(y and nod and exp<tree[nod].size()) ~~~^~~~~~~~~~~~~~~~~ main.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nod and exp>=tree[nod].size() and y) nod=0; ~~~^~~~~~~~~~~~~~~~~~