Compilare: main.cpp: In function 'int main()': main.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll k=0;k<v[1].size();++k) ~^~~~~~~~~~~~ main.cpp:49:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll j=0;j<v[2].size();++j) ~^~~~~~~~~~~~ main.cpp:54:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll r=0;r<v[1].size();++r) ~^~~~~~~~~~~~ main.cpp:56:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll j=0;j<v[i].size();++j) ~^~~~~~~~~~~~ main.cpp:59:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll k=0;k<v[i-1].size();++k) ~^~~~~~~~~~~~~~ main.cpp:62:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll j=0;j<v[i].size();++j) ~^~~~~~~~~~~~ main.cpp:67:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll k=0;k<v[1].size();++k) ~^~~~~~~~~~~~ main.cpp:68:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll j=0;j<v[n].size();++j) ~^~~~~~~~~~~~