Compilare: user.cpp: In function ‘void Dijkstra()’: user.cpp:94:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Graph[ k ].size(); i++) { ^ user.cpp: In function ‘void readData()’: user.cpp:51:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ user.cpp:53:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &nodes, &edges); ^ user.cpp:57:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &node.y, &node.cost); ^ user.cpp: In function ‘void writeData()’: user.cpp:122:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^