Compilare: main.cpp: In function 'bool match(int, int)': main.cpp:63:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<child[1][a].size();i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp:86:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return val>=child[2][b].size(); ~~~^~~~~~~~~~~~~~~~~~~~