Compilare: main.cpp: In function 'int main()': main.cpp:67:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < vals[i].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp:73:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < vals[i - D].size(); ++j) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < vals[i].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp:82:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < vals[i].size(); ++j) ~~^~~~~~~~~~~~~~~~