Compilare: main.cpp: In member function 'Edge* Vertex::getNextEdge()': main.cpp:91:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(currentEdge == incidentFromEdges.size()) { ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Vertex::moveToNextEdge()': main.cpp:100:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(currentEdge == incidentFromEdges.size()) { ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:141:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in","r",stdin); ^ main.cpp:142:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out","w",stdout); ^ main.cpp:144:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&M); ^ main.cpp:153:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&capacity); ^