Compilare: user.cpp: In function ‘bool dfs()’: user.cpp:22: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void maxflow()’: user.cpp:41: warning: comparison between signed and unsigned integer expressions user.cpp:38: warning: unused variable ‘step’ user.cpp: In function ‘int main()’: user.cpp:64: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:65: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result