Compilare: user.cpp: In function ‘int main()’: user.cpp:15:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ user.cpp:18:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&v[(i-1)*n+j].first); ^ user.cpp:62:21: warning: ‘cm’ may be used uninitialized in this function [-Wmaybe-uninitialized] cm=pa[x][y].second; ~~~~~~~~~^~~~~~ user.cpp:62:21: warning: ‘lm’ may be used uninitialized in this function [-Wmaybe-uninitialized]