Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n)  for(long long i=0;i<(long long)(n);i++)
#define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
#define all(a) a.begin(),a.end()
#define pb push_back
#define eb emplace_back
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
#define ub(v,k) (upper_bound(all(v),k)-v.begin())
#define fi first
#define se second
#define pi M_PI
#define PQ(T) priority_queue<T>
#define SPQ(T) priority_queue<T,vector<T>,greater<T>>
#define dame(a) {out(a);return 0;}
#define decimal cout<<fixed<<setprecision(15);
typedef long long ll;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef tuple<ll,ll,ll,ll> PPP;
typedef multiset<ll> S;
using vi=vector<ll>;
using vvi=vector<vi>;
using vvvi=vector<vvi>;
using vp=vector<P>;
using vvp=vector<vp>;
using vb=vector<bool>;
using vvb=vector<vb>;
const ll inf=1001001001001001001;
const int INF=1001001001;
const int mod=1000000007;
const double eps=1e-10;
template<class T> bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
template<class T> bool chmax(T&a,T b){if(a<b){a=b;return true;}return false;}
template<class T> void out(T a){cout<<a<<'\n';}
template<class T> void outp(T a){cout<<'('<<a.fi<<','<<a.se<<')'<<'\n';}
template<class T> void outvp(T v){rep(i,v.size())cout<<'('<<v[i].fi<<','<<v[i].se<<')';cout<<'\n';}
template<class T> void outvvp(T v){rep(i,v.size())outvp(v[i]);}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<'\n';}
template<class T> void outvv(T v){rep(i,v.size())outv(v[i]);}
template<class T> bool isin(T x,T l,T r){return (l)<=(x)&&(x)<=(r);}
template<class T> void yesno(T b){if(b)out("yes");else out("no");}
template<class T> void YesNo(T b){if(b)out("Yes");else out("No");}
template<class T> void YESNO(T b){if(b)out("YES");else out("NO");}
template<class T> void noyes(T b){if(b)out("no");else out("yes");}
template<class T> void NoYes(T b){if(b)out("No");else out("Yes");}
template<class T> void NOYES(T b){if(b)out("NO");else out("YES");}
void outs(ll a,ll b){if(a>=inf-100)out(b);else out(a);}
ll gcd(ll a,ll b){if(b==0)return a;return gcd(b,a%b);}
ll modpow(ll a,ll b){a%=mod;if(b==0)return 1;if(b&1)return a*modpow(a,b-1)%mod;ll k=modpow(a,b/2);return k*k%mod;}
ll inv(ll a){return modpow(a,mod-2);}
int main(){
    ll n;cin>>n;
    vi t(n);
    rep(i,n)cin>>t[i];
    ll x=0,y=0;
    rep(i,n){
        if(i&1)x+=max(0ll,t[i]);
        else y+=max(0ll,t[i]);
    }
    ll dif=0;
    out(max(x,y));
    vi v;
        vb use(n,false);
        rep(i,n)if(t[i]>=0&&(x>y&&i%2)||(x<=y&&i%2==0)use[i]=true;
        ll w=0;
        while(w<n){
            if(use[w])break;
            v.pb(1+w);
            dif++;
            w++;
        }
        for(int i=n-1;i>=0;i--){
            if(use[i])break;
            v.pb(1+i-dif);
            n--;
        }
        if(w==n){
            out(v.size());
            for(ll x:v)out(x);
        }
        for(int i=w;i+1<n;i+=2){
            if(use[i])continue;
            v.pb(1+i-dif);
            dif+=2;
        }
        rep(i,(n-dif)/2)v.pb(2);
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:65:55: error: expected ';' before 'use'
   65 |         rep(i,n)if(t[i]>=0&&(x>y&&i%2)||(x<=y&&i%2==0)use[i]=true;
      |                                                       ^~~
      |                                                       ;
a.cc:66:15: error: expected ')' before ';' token
   66 |         ll w=0;
      |               ^
      |               )
a.cc:65:19: note: to match this '('
   65 |         rep(i,n)if(t[i]>=0&&(x>y&&i%2)||(x<=y&&i%2==0)use[i]=true;
      |                   ^
a.cc:67:15: error: 'w' was not declared in this scope
   67 |         while(w<n){
      |               ^
a.cc:78:12: error: 'w' was not declared in this scope
   78 |         if(w==n){
      |            ^
a.cc:82:19: error: 'w' was not declared in this scope
   82 |         for(int i=w;i+1<n;i+=2){
      |                   ^