cuvinte.cpp: In function 'void read()': cuvinte.cpp:37: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result cuvinte.cpp: In function 'int pairup(int)': cuvinte.cpp:78: warning: comparison between signed and unsigned integer expressions cuvinte.cpp:87: warning: comparison between signed and unsigned integer expressions cuvinte.cpp: In function 'void solve_problem(int)': cuvinte.cpp:103: warning: comparison between signed and unsigned integer expressions cuvinte.cpp: In function 'int main()': cuvinte.cpp:148: warning: comparison between signed and unsigned integer expressions cuvinte.cpp:142: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result cuvinte.cpp:143: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result In file included from /usr/include/stdio.h:910, from cuvinte.cpp:1: In function 'char* fgets(char*, int, FILE*)', inlined from 'void read()' at cuvinte.cpp:37: /usr/include/bits/stdio2.h:253: warning: call to '__fgets_chk_warn' declared with attribute warning: fgets called with bigger size than length of destination buffer