Submission #246788

#	Time	Username	Problem	Language	Result	Execution time	Memory
246788		leaked	Nizin (COCI16_nizin)	C++14	0 / 100	365 ms	65540 KiB

nizin

#include<bits/stdc++.h>
using namespace std;
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>
//
//    #pragma GCC optimize("unroll-loops")
//    #pragma GCC optimize("Ofast")
//    #pragma GCC optimize("-O3")
//    #pragma GCC optimize("no-stack-protector")
//    #pragma GCC optimize("fast-math")
//#define LOCAL
#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
  enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cout<< *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cout << endl; }
eni(!=) cout << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (auto it = d.b; it != d.e; ++it)
	*this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define deb(...) cout<<" [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "<<endl;
#define fi first
#define f first
#define se second
#define s second
#define vi_a vector<int>a;
#define p_b push_back
////////////////////////////////???????????????CHECK THIS OUT???????????????//////////////////////////////
#define ll long long
////////////////////////////////???????????????CHECK THIS OUT???????????????//////////////////////////////
#define ld long double
#define pll pair<ll,ll>
#define pii pair<int,int>
#define m_p make_pair
#define fast_io cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);
#define all(x) x.begin(),x.end()
#define getfiles    ifstream cin("input.txt");ofstream cout("output.txt");
#define pw(x) (1ll << x)
#define sz(x) (ll)x.size()
#define endl "\n"
#define rall(x) x.rbegin(),x.rend()
#define len(a) (ll)a.size()
#define rep(x,l,r) for(ll x=l;x<r;x++)

//using namespace __gnu_pbds;
ld eps = (ld)1 / 1e6;
const ld pi=3.14159265359;
ll inf = 1e18,mod1=1e9+7;
ll sqr(ll a) { return a * a; }
ll qb(ll a) { return a * a * a; }
ll gcd(ll a, ll b) { return !a ? b : gcd(b % a, a); }
ll binpow(ll a, ll b, ll mod) { return b ? (b % 2 ? (a * (sqr(binpow(a, b / 2, mod)) % mod)) % mod : sqr(binpow(a, b / 2, mod)) % mod) : 1; }
ll binmult(ll a, ll b, ll mod) { return b ? (b % 2 ? (2 * binmult(a, b / 2, mod) + a) % mod : (2 * binmult(a, b / 2, mod)) % mod) : 0; }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const ll R=1e4;
const ll tx[4]={0,0,-1,1};
const ll ty[4]={-1,1,0,0};
const char rev_to[4]={'E','W','N','S'};
const int N=1e5+1;
const int M=1e9+7;
const int K=51;

signed main(){
    fast_io;
    int n;
    cin>>n;
    vector<int>a(n);
    vector<ll>b(n);
    for(auto &z : a) cin>>z;
    map<ll,int>pref,suf;
    ll s=0;
    for(int i=0;i<=(n/2-(n%2==0));i++){
        s+=a[i];
        pref[s]=i;
        b[i]=s;
    }
    s=0;
    for(int i=n-1;i>=n/2;i--){
        s+=a[i];
        suf[s]=i;
     //   cout<<i;cout.flush();
    }
    s=0;
    int ans=0;
    int i=0,j=n-1;
    while(i<j){
        s=b[i];
        if(a[i]==a[j]){
            i++;
            j--;
        }
        else{
            int mn=1e9;
            if(a[i]>a[j]){
                if(suf.find(s)!=suf.end()){
                        mn=min(mn,suf[s]-j);
                        ans+=mn;
                        j=suf[s];
                        i++;
                }
            }
            else{
                //cout<<s-a[i]+a[j]<<endl;
                if(pref.find(s-a[i]+a[j])!=pref.end()){
                        mn=min(mn,pref[s-a[i]+a[j]]-i);
                        ans+=mn;
                        i=pref[s-a[i]+a[j]];
                        j--;
                }
            }
            if(mn==1e9){
                a[i+1]+=a[i];
                a[j-1]+=a[j];
                ans+=j-i;
                i++;
                j--;
            }
        }
    }
    cout<<ans;
    return 0;
}
///stuff you should look for :
/*0
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* read the conditions carefully
	* WRITE STUFF DOWN
*/

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