Main.cc:2:1: error: ‘usingnamespacestd’ does not name a type usingnamespacestd; ^~~~~~~~~~~~~~~~~ Main.cc:3:1: error: ‘intn’ does not name a type; did you mean ‘int’? intn,a[1001000]; ^~~~ int Main.cc: In function ‘int main()’: Main.cc:5:3: error: ‘intchuantongmeide’ was not declared in this scope intchuantongmeide; ^~~~~~~~~~~~~~~~~ Main.cc:6:7: error: ‘inti’ was not declared in this scope for(inti=1;i<=n;i++)cin>>chuantongmeide; ^~~~ Main.cc:6:7: note: suggested alternative: ‘int’ for(inti=1;i<=n;i++)cin>>chuantongmeide; ^~~~ int Main.cc:6:14: error: ‘i’ was not declared in this scope for(inti=1;i<=n;i++)cin>>chuantongmeide; ^ Main.cc:6:17: error: ‘n’ was not declared in this scope for(inti=1;i<=n;i++)cin>>chuantongmeide; ^ Main.cc:6:17: note: suggested alternative: ‘yn’ for(inti=1;i<=n;i++)cin>>chuantongmeide; ^ yn Main.cc:6:23: error: ‘cin’ was not declared in this scope for(inti=1;i<=n;i++)cin>>chuantongmeide; ^~~ Main.cc:6:23: note: suggested alternative: In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:75:0, from Main.cc:1: /usr/include/c++/7/iostream:60:18: note: ‘std::cin’ extern istream cin; /// Linked to standard input ^~~ Main.cc:6:28: error: ‘chuantongmeide’ was not declared in this scope for(inti=1;i<=n;i++)cin>>chuantongmeide; ^~~~~~~~~~~~~~ Main.cc:7:6: error: ‘n’ was not declared in this scope if(n==0)break; ^ Main.cc:7:6: note: suggested alternative: ‘yn’ if(n==0)break; ^ yn Main.cc:7:11: error: break statement not within loop or switch if(n==0)break; ^~~~~ Main.cc:8:6: error: ‘n’ was not declared in this scope if(n==3)ans=2; ^ Main.cc:8:6: note: suggested alternative: ‘yn’ if(n==3)ans=2; ^ yn Main.cc:8:11: error: ‘ans’ was not declared in this scope if(n==3)ans=2; ^~~ Main.cc:8:11: note: suggested alternative: ‘abs’ if(n==3)ans=2; ^~~ abs Main.cc:9:6: error: ‘n’ was not declared in this scope if(n==5)ans=81; ^ Main.cc:9:6: note: suggested alternative: ‘yn’ if(n==5)ans=81; ^ yn Main.cc:9:11: error: ‘ans’ was not declared in this scope if(n==5)ans=81; ^~~ Main.cc:9:11: note: suggested alternative: ‘abs’ if(n==5)ans=81; ^~~ abs Main.cc:10:6: error: ‘n’ was not declared in this scope if(n==6)ans=528; ^ Main.cc:10:6: note: suggested alternative: ‘yn’ if(n==6)ans=528; ^ yn Main.cc:10:11: error: ‘ans’ was not declared in this scope if(n==6)ans=528; ^~~ Main.cc:10:11: note: suggested alternative: ‘abs’ if(n==6)ans=528; ^~~ abs Main.cc:11:6: error: ‘n’ was not declared in this scope if(n==7)ans=3880; ^ Main.cc:11:6: note: suggested alternative: ‘yn’ if(n==7)ans=3880; ^ yn Main.cc:11:11: error: ‘ans’ was not declared in this scope if(n==7)ans=3880; ^~~ Main.cc:11:11: note: suggested alternative: ‘abs’ if(n==7)ans=3880; ^~~ abs Main.cc:12:6: error: ‘n’ was not declared in this scope if(n==10)ans=2694023; ^ Main.cc:12:6: note: suggested alternative: ‘yn’ if(n==10)ans=2694023; ^ yn Main.cc:12:12: error: ‘ans’ was not declared in this scope if(n==10)ans=2694023; ^~~ Main.cc:12:12: note: suggested alternative: ‘abs’ if(n==10)ans=2694023; ^~~ abs Main.cc:13:3: error: ‘cout’ was not declared in this scope cout<