Compilare: user.cpp: In function ‘int main()’: user.cpp:32:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok=0; ^ user.cpp:20:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:25:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[(i-1)*n+j].val); ^