Compilare: user.cpp: In member function ‘void PascalTriangle::build()’: user.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j < comb[i-1].size() && comb[i-1][j] == kInf) { ^ user.cpp:32:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] comb[i].push_back(comb[i-1][j-1] + (j < comb[i-1].size() ? comb[i-1][j] : 0)); ^ user.cpp: In member function ‘int64 PascalTriangle::get(int, int)’: user.cpp:49:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (comb[n].size() <= k) { ^