Compilare: user.cpp: In function ‘int main()’: user.cpp:105:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<Lista[i].size();t++) ^ user.cpp:108:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Lista[k].size();i++) ^ user.cpp:44:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.in","r",stdin); ^ user.cpp:45:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.out","w",stdout); ^ user.cpp:46:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^