Compilare: user.cpp: In function ‘int main()’: user.cpp:147:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i) ^ user.cpp:125:40: warning: variable ‘step1’ set but not used [-Wunused-but-set-variable] int ii, jj, p1 = 1,p2 = 2*n-1, step1, step2; ^ user.cpp:125:47: warning: variable ‘step2’ set but not used [-Wunused-but-set-variable] int ii, jj, p1 = 1,p2 = 2*n-1, step1, step2; ^ user.cpp:86:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("caroiaj.in","r",stdin); ^ user.cpp:87:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("caroiaj.out","w",stdout); ^