trafic.cpp: In function 'void BellmanFord(int, int*)': trafic.cpp:23: warning: comparison between signed and unsigned integer expressions trafic.cpp: In function 'bool BFS()': trafic.cpp:43: warning: comparison between signed and unsigned integer expressions trafic.cpp: In function 'int MaximumFlow()': trafic.cpp:57: warning: comparison between signed and unsigned integer expressions trafic.cpp: In function 'bool Check(int)': trafic.cpp:78: warning: comparison between signed and unsigned integer expressions trafic.cpp: In function 'int main()': trafic.cpp:92: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result trafic.cpp:93: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result trafic.cpp:95: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result trafic.cpp:97: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result