Envío 4389

Código

#include <algorithm>
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<int> vi;
typedef vector<ll> vl;
#define sz(x) ((int)x.size())
#define MPI  3.14159265358979323846
#define pb push_back
#define all(x) x.begin(), x.end()

void __print(int x) {cerr << x;}
void __print(ll x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V> void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T> void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}

void _print() {cerr << "]\n";}
template <typename T, typename... V> void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}

#ifndef Debug
#define dbg(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define dbg(x...)
#endif

void solve(){
  int n; cin>>n;
  vector<int>a(n);
  for(int i=0; i<n; i++){
    cin>>a[i];
  }
  vector<int>p(n+1);
  for(int i=n-1; i>=0; i--){
    p[i] = p[i+1] + a[i];
  }
  if(p[0] < 0){
    cout<<"Impossible"<<endl;
    return;
  }
  for(int i=0; i<n; i++){
    if(p[i] < 0 ){
      cout<<i<<endl;
      return;
    }
  }
  cout<<"Impossible"<<endl;
}


int main(){
  ios::sync_with_stdio(0); cin.tie(0);  cout.tie(0);
  int T=1; 
//  cin>> T;
  while(T--){
    solve();
  }
  return 0;
}