iepuri.cpp: In function 'void compute(int)': iepuri.cpp:14: warning: comparison between signed and unsigned integer expressions iepuri.cpp:18: warning: comparison between signed and unsigned integer expressions iepuri.cpp: In function 'int main()': iepuri.cpp:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result iepuri.cpp:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result iepuri.cpp:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result iepuri.cpp:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result iepuri.cpp:28: warning: 'root' may be used uninitialized in this function