cabane.cpp: In function 'void BuildGraph()': cabane.cpp:44: warning: comparison between signed and unsigned integer expressions cabane.cpp:45: warning: comparison between signed and unsigned integer expressions cabane.cpp:50: warning: comparison between signed and unsigned integer expressions cabane.cpp:52: warning: comparison between signed and unsigned integer expressions cabane.cpp:55: warning: comparison between signed and unsigned integer expressions cabane.cpp:40: warning: unused variable 'which' cabane.cpp: In function 'int main()': cabane.cpp:73: warning: comparison between signed and unsigned integer expressions cabane.cpp:79: warning: comparison between signed and unsigned integer expressions cabane.cpp:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result cabane.cpp:67: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result cabane.cpp:69: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result