distsir.cpp: In function 'int main()': distsir.cpp:18: warning: comparison between signed and unsigned integer expressions distsir.cpp:19: warning: comparison between signed and unsigned integer expressions distsir.cpp:27: warning: comparison between signed and unsigned integer expressions distsir.cpp:27: warning: comparison between signed and unsigned integer expressions distsir.cpp:45: warning: comparison between signed and unsigned integer expressions distsir.cpp:46: warning: comparison between signed and unsigned integer expressions distsir.cpp:16: warning: unused variable 'maxlen' distsir.cpp:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result