Compilare: main.cpp: In function 'int main()': main.cpp:67:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(int j=0;j<V[first].size();j++) | ~^~~~~~~~~~~~~~~~ main.cpp:68:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(int d=0;d<V[second].size();d++) | ~^~~~~~~~~~~~~~~~~ main.cpp:72:54: warning: 'd' may be used uninitialized [-Wmaybe-uninitialized] 72 | int d=V[second][d]-V[first][j]-1; | ^ main.cpp:72:41: note: 'd' was declared here 72 | int d=V[second][d]-V[first][j]-1; | ^