Eroare de compilare: user.cpp: In function ‘void bellman_ford(int)’: user.cpp:30:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[k].size(); ++i) ^ user.cpp: At global scope: user.cpp:47:1: error: ‘unordered_map’ does not name a type unordered_map<pair<int, int>, int> edges; ^ user.cpp: In function ‘void bfs(int)’: user.cpp:61:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < b[k].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:87:13: error: ‘edges’ was not declared in this scope edges[make_pair(x, y)] = i; ^ user.cpp:107:55: error: ‘edges’ was not declared in this scope for(map<pair<int, int>, int> :: iterator it = edges.begin(); it != edges.end(); ++it) ^ user.cpp:113:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < b[i].size(); ++j) ^ user.cpp:115:26: error: ‘edges’ was not declared in this scope edge_lev[edges[make_pair(i, b[i][j])]] = make_pair(lev[b[i][j]], edges[make_pair(i, b[i][j])]); ^ user.cpp:130:9: error: ‘edges’ was not declared in this scope edges.clear(); ^