metrou.cpp: In function 'void newChain(int)': metrou.cpp:37: warning: comparison between signed and unsigned integer expressions metrou.cpp:52: warning: comparison between signed and unsigned integer expressions metrou.cpp: In function 'int solveChain()': metrou.cpp:83: warning: comparison between signed and unsigned integer expressions metrou.cpp: In function 'int solve()': metrou.cpp:105: warning: comparison between signed and unsigned integer expressions metrou.cpp:121: warning: comparison between signed and unsigned integer expressions metrou.cpp: In function 'int main()': metrou.cpp:146: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result metrou.cpp:147: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result metrou.cpp:148: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result metrou.cpp:149: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result metrou.cpp:151: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result