Compilare: main.cpp: In function 'int getNr(int, int)': main.cpp:109:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(down[a].size() >= l - nr + 1) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'void comb(int, int)': main.cpp:120:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < down[b].size(); i ++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfsDown(int)': main.cpp:149:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(down[a].size() >= l - (old[a] + 1) + 1) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:151:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(down[a].size() >= l - old[a] + 1) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~