Compilare: main.cpp: In function 'void dfs(std::pair<int, int>, int)': main.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(start.second!=matrice[start.first+1].size()-1) ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr-st+1!=directionsMinim.size()) ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~