Compilare: main.cpp: In function 'void solve()': main.cpp:49:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i< elems.size(); i++){ ~^~~~~~~~~~~~~~ main.cpp:50:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j<elems.size(); j++){ ~^~~~~~~~~~~~~ main.cpp:51:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k<elems.size(); k++){ ~^~~~~~~~~~~~~ main.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i< elems.size(); i++){ ~^~~~~~~~~~~~~~ main.cpp:58:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j<elems.size(); j++){ ~^~~~~~~~~~~~~ main.cpp:59:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k<elems.size(); k++){ ~^~~~~~~~~~~~~