Compilare: user.cpp: In function ‘int main()’: user.cpp:28:25: warning: unused variable ‘iv’ [-Wunused-variable] int li,ci,lf,cf,i,j,iv,jv; ^~ user.cpp:28:28: warning: unused variable ‘jv’ [-Wunused-variable] int li,ci,lf,cf,i,j,iv,jv; ^~ user.cpp:29:54: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d%d%d",&n,&m,&li,&ci,&lf,&cf); ^ user.cpp:32:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a[i][j]); ^