Compilare: user.cpp: In function ‘mazi solve(int*, int, bool, bool)’: user.cpp:70:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<aux.A.size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:112:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<R.A.size();i++) ^ user.cpp:79:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("soc.in","r",stdin); ^ user.cpp:80:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("soc.out","w",stdout); ^ user.cpp:83:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&n,&m); ^ user.cpp:86:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&E[i]); ^ user.cpp:89:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&x,&y); ^