Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i ++) { ~~^~~~~~~~~~~~~~~~ user.cpp: In function ‘int dfs(int, int)’: user.cpp:52:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = rem[from]; i < g[from].size(); i ++) { ~~^~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:92:49: warning: narrowing conversion of ‘g[(i * 2)].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[i * 2 - 1].push_back({i * 2, g[i * 2].size(), 1, 0}); ~~~~~~~~~~~~~^~ user.cpp:93:56: warning: narrowing conversion of ‘(g[((i * 2) - 1)].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >() - 1u)’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[i * 2].push_back({i * 2 - 1, g[i * 2 - 1].size() - 1, 1, 0}); ~~~~~~~~~~~~~~~~~~~~^~~ user.cpp:104:53: warning: narrowing conversion of ‘g[((y * 2) - 1)].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[x * 2].push_back({y * 2 - 1, g[y * 2 - 1].size(), 1, 0}); ~~~~~~~~~~~~~~~~~^~ user.cpp:105:52: warning: narrowing conversion of ‘(g[(x * 2)].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >() - 1u)’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[y * 2 - 1].push_back({x * 2, g[x * 2].size() - 1, 0, 0}); ~~~~~~~~~~~~~~~~^~~ user.cpp:107:53: warning: narrowing conversion of ‘g[((x * 2) - 1)].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[y * 2].push_back({x * 2 - 1, g[x * 2 - 1].size(), 1, 0}); ~~~~~~~~~~~~~~~~~^~ user.cpp:108:52: warning: narrowing conversion of ‘(g[(y * 2)].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >() - 1u)’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[x * 2 - 1].push_back({y * 2, g[y * 2].size() - 1, 0, 0}); ~~~~~~~~~~~~~~~~^~~ user.cpp:87:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d %d", &n, &m, &src, &dest); ^ user.cpp:102:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^