Compilare: main.cpp: In function 'void comb(int, int, int)': main.cpp:170:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < g[b].size() && j < g[c].size()) ~~^~~~~~~~~~~~~ main.cpp:170:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < g[b].size() && j < g[c].size()) ~~^~~~~~~~~~~~~ main.cpp:185:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < g[b].size()) ~~^~~~~~~~~~~~~ main.cpp:191:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < g[c].size()) ~~^~~~~~~~~~~~~