Compilare: user.cpp: In function ‘void addedge(int, int, int, int)’: user.cpp:46:29: warning: narrowing conversion of ‘g[to].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] direct = {to, g[to].size(), 0, cap, 0}; ^ user.cpp:47:33: warning: narrowing conversion of ‘g[from].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] inverse = {from, g[from].size(), 0, 0, 0}; ^ user.cpp:52:29: warning: narrowing conversion of ‘g[to].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] direct = {to, g[to].size(), 0, INF, cost}; ^ user.cpp:53:33: warning: narrowing conversion of ‘g[from].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] inverse = {from, g[from].size(), 0, 0, -cost}; ^ user.cpp: In function ‘void bellmanford()’: user.cpp:70:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++){ ^ user.cpp: In function ‘void dijkstra()’: user.cpp:100:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++){ ^ user.cpp: In function ‘void specialedge()’: user.cpp:145:32: warning: narrowing conversion of ‘g[1].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge direct = {1, g[1].size(), 0, x, 0}; ^