Compilare: user.cpp: In function ‘int main()’: user.cpp:24:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&N); ^ user.cpp:26:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&v[i].first,&v[i].second); ^ user.cpp:28:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&t); ^ user.cpp:74:18: warning: ‘next’ may be used uninitialized in this function [-Wmaybe-uninitialized] MaxK=next; ^