Compilare: user.cpp: In function ‘int cuplaj(int)’: user.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<p[x].size();i++) { ^ user.cpp:28:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<p[x].size();i++) { ^ user.cpp: In function ‘int main()’: user.cpp:43:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algebra.out","w",stdout); ^