Compilare: user.cpp: In function ‘int main()’: user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<p[i].size();j++) ^ user.cpp:11:13: warning: unused variable ‘l’ [-Wunused-variable] int i,j,l; ^ user.cpp:12:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dicsi.in","r",stdin); ^ user.cpp:13:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dicsi.out","w",stdout); ^ user.cpp:14:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^