algola.cpp: In function 'bool BFS()': algola.cpp:33: warning: comparison between signed and unsigned integer expressions algola.cpp: In function 'int MaximumFlow()': algola.cpp:48: warning: comparison between signed and unsigned integer expressions algola.cpp: In function 'int main()': algola.cpp:83: warning: comparison between signed and unsigned integer expressions algola.cpp:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result algola.cpp:64: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result algola.cpp:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result algola.cpp:68: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result algola.cpp:73: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result