Compilare: main.cpp: In function 'void addEdge(int, int, int)': main.cpp:21:40: warning: narrowing conversion of 'g[y].std::vector<_Tp, _Alloc>::size<edge, std::allocator<edge> >()' from 'std::vector<edge>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[x].push_back({y, 0, flow, g[y].size()}); ~~~~~~~~~^~ main.cpp:22:40: warning: narrowing conversion of '(g[x].std::vector<_Tp, _Alloc>::size<edge, std::allocator<edge> >() - 1ul)' from 'std::vector<edge>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[y].push_back({x, 0, 0, g[x].size() - 1}); ~~~~~~~~~~~~^~~ main.cpp: In function 'int dfs(int, int, int)': main.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;start[u] < g[u].size(); start[u]++) { ~~~~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:7: warning: unused variable 's1' [-Wunused-variable] int s1 = 0; ^~