gsm.cpp: In function 'double solve(int)': gsm.cpp:66: warning: comparison between signed and unsigned integer expressions gsm.cpp:69: warning: comparison between signed and unsigned integer expressions gsm.cpp:87: warning: comparison between signed and unsigned integer expressions gsm.cpp: In function 'int main()': gsm.cpp:117: warning: format '%lf' expects type 'double', but argument 3 has type 'clock_t' gsm.cpp:95: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result gsm.cpp:96: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result gsm.cpp:97: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result gsm.cpp:98: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result gsm.cpp:100: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result