Compilare: user.cpp: In function ‘int main()’: user.cpp:8:14: warning: unused variable ‘val’ [-Wunused-variable] {int j,a,n,t,val,i; ^ user.cpp:9:11: warning: unused variable ‘b’ [-Wunused-variable] long long b,c,s; ^ user.cpp:9:13: warning: unused variable ‘c’ [-Wunused-variable] long long b,c,s; ^ user.cpp:10:18: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.cpp:12:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:15:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++){ fscanf(f,"%lld",&w[i]); ^ user.cpp:17:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] } for(i=1;i<=n;i++){ fscanf(f,"%lld",&u[i]); ^