Compilare: user.cpp: In function ‘int ori(int)’: user.cpp:49:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ^ user.cpp: In function ‘int top()’: user.cpp:72:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[r].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:19:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&k); ^ user.cpp:24:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%16i%16i",&a,&b); ^ user.cpp: In function ‘int top()’: user.cpp:78:12: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] return r; ^