Compilare: user.cpp: In function ‘bool Flow()’: user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void BuildFlowNetwork()’: user.cpp:61: warning: comparison between signed and unsigned integer expressions user.cpp:62: warning: operation on ‘fiu’ may be undefined user.cpp: In function ‘void BellmanFord()’: user.cpp:95: warning: comparison between signed and unsigned integer expressions user.cpp:96: warning: operation on ‘vecin’ may be undefined user.cpp: In function ‘void citire()’: user.cpp:111: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:113: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:116: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void afis()’: user.cpp:134: warning: comparison between signed and unsigned integer expressions user.cpp:130: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result