Eroare de compilare: user.cpp:19:32: error: ISO C++ forbids declaration of ‘operator<’ with no type [-fpermissive] operator<(const edge& other){ ^ user.cpp:38:1: error: ‘vector’ does not name a type vector<edge> solution; ^~~~~~ user.cpp: In function ‘void linkEdge()’: user.cpp:83:5: error: ‘solution’ was not declared in this scope solution.push_back(edges[crtEdge]); ^~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:114:19: error: ‘solution’ was not declared in this scope for(auto &x : solution) ^~~~~~~~ user.cpp:118:19: error: ‘solution’ was not declared in this scope for(auto &x : solution) ^~~~~~~~ user.cpp:93:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^