lant.cpp: In function 'void compute(int)': lant.cpp:39: warning: comparison between signed and unsigned integer expressions lant.cpp: In function 'int main()': lant.cpp:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result lant.cpp:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result lant.cpp:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result lant.cpp:48: warning: 'current_length' may be used uninitialized in this function