metrou.cpp: In function 'void newChain(int)': metrou.cpp:74: warning: comparison between signed and unsigned integer expressions metrou.cpp:104: warning: comparison between signed and unsigned integer expressions metrou.cpp: In function 'int solveChain()': metrou.cpp:162: warning: comparison between signed and unsigned integer expressions metrou.cpp: In function 'int solve()': metrou.cpp:204: warning: comparison between signed and unsigned integer expressions metrou.cpp:225: warning: comparison between signed and unsigned integer expressions metrou.cpp: In function 'int main()': metrou.cpp:268: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result metrou.cpp:269: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result metrou.cpp:271: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result metrou.cpp:273: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result metrou.cpp:277: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result