Compilare: main.cpp: In function 'void add(int, int)': main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[nr].elem.size();++i) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dell(int, int)': main.cpp:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[nr].elem.size();++i) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool findd(int, int)': main.cpp:44:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[nr].elem.size();++i) ~^~~~~~~~~~~~~~~~~~