Compilare: user.cpp: In function ‘bool cmp(abc, abc)’: user.cpp:21:12: warning: statement has no effect [-Wunused-value] A.rest < B.rest; ^ user.cpp: In function ‘int main()’: user.cpp:28:9: warning: unused variable ‘f’ [-Wunused-variable] int f,mid,st,dr,i,j,ii,A,B,n,k,t; ^ user.cpp:28:11: warning: unused variable ‘mid’ [-Wunused-variable] int f,mid,st,dr,i,j,ii,A,B,n,k,t; ^ user.cpp:28:15: warning: unused variable ‘st’ [-Wunused-variable] int f,mid,st,dr,i,j,ii,A,B,n,k,t; ^ user.cpp:28:18: warning: unused variable ‘dr’ [-Wunused-variable] int f,mid,st,dr,i,j,ii,A,B,n,k,t; ^ user.cpp:28:23: warning: unused variable ‘j’ [-Wunused-variable] int f,mid,st,dr,i,j,ii,A,B,n,k,t; ^ user.cpp:28:25: warning: unused variable ‘ii’ [-Wunused-variable] int f,mid,st,dr,i,j,ii,A,B,n,k,t; ^ user.cpp:28:36: warning: unused variable ‘t’ [-Wunused-variable] int f,mid,st,dr,i,j,ii,A,B,n,k,t; ^ user.cpp:29:15: warning: unused variable ‘ans’ [-Wunused-variable] long long ans=0; ^ user.cpp: In function ‘bool cmp(abc, abc)’: user.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:25:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.in","r",stdin); ^ user.cpp:26:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.out","w",stdout); ^ user.cpp:31:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&k,&A,&B); ^ user.cpp:33:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for( i = 1; i <= n; ++i ) scanf("%lld",&v[i]); ^