Compilare: user.cpp: In lambda function: user.cpp:91:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((unsigned)p.first < n && (unsigned)p.second < n && rez[p.first][p.second] == inf){ ^ user.cpp:91:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((unsigned)p.first < n && (unsigned)p.second < n && rez[p.first][p.second] == inf){ ^ user.cpp: In function ‘int main()’: user.cpp:126:20: warning: unused variable ‘tmp’ [-Wunused-variable] for(int i = 0, tmp; i < n; ++i){ ^