Submission #831189

#	Time	Username	Problem	Language	Result	Execution time	Memory
831189		TB_	Hacker (BOI15_hac)	C++17	100 / 100	237 ms	26216 KiB

hac

#include <bits/stdc++.h>
using namespace std;

// #undef _GLIBCXX_DEBUG                // disable run-time bound checking, etc
// #pragma GCC optimize("Ofast,inline") // Ofast = O3,fast-math,allow-store-data-races,no-protect-parens
// #pragma GCC optimize ("unroll-loops")

// #pragma GCC target("bmi,bmi2,lzcnt,popcnt")                      // bit manipulation
// #pragma GCC target("movbe")                                      // byte swap
// #pragma GCC target("aes,pclmul,rdrnd")                           // encryption
// #pragma GCC target("avx,avx2,f16c,fma,sse3,ssse3,sse4.1,sse4.2") // SIMD

// #include <bits/extc++.h>
// using namespace __gnu_pbds;
// template<class T>using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
// template<class T>using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define ll long long
#define INF (ll)1e9+7
#define fo(i, n) for(ll i=0;i<((ll)n);i++)
#define deb(x) cout << #x << " = " << x << endl;
#define deb2(x, y) cout << #x << " = " << x << ", " << #y << " = " << y << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define LSOne(S) ((S) & (-S))
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
inline int readint(){ int v = 0; char c; while((c = getchar()) != EOF && c != ' ' && c != '\n'){ v *= 10; v += c - '0'; } return v; }
inline int readintsigned() { int v = 0; int sign = 1; char c = getchar(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = getchar()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } return v * sign; }
inline string readstring() { string s; char c; while ((c = getchar()) != EOF && c != '\n' && c != ' ') { s.push_back(c); } return s; }
template <class result_t=std::chrono::milliseconds,class clock_t=std::chrono::steady_clock,class duration_t = std::chrono::milliseconds>
auto since(std::chrono::time_point<clock_t, duration_t> const& start){return std::chrono::duration_cast<result_t>(clock_t::now() - start);}
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vpii> vvpii;
typedef vector<vpl> vvpl;



int main() {
    // cout << fixed << setprecision(20);
    // auto start = std::chrono::steady_clock::now(); // since(start).count()
    cin.tie(0)->sync_with_stdio(0);

    ll n, val;
    cin >> n;
    vl v(n);
    fo(i, n) cin>>v[i];
    fo(j, 2)
        fo(i, n) v.pb(v[i]);
    for(int i = 1; i < n*3; i++) v[i] += v[i-1];

    ll ans = 0, half = n/2+(n%2);
    pl current = {1e10, 2e10}, amount = {0, 0};

    multiset<ll> s;
    fo(i, half){
        val = v[i+n]-v[i+n-half];
        s.insert(val);
        ans=*s.begin();
    }
    for(int i = n+1; i < n*2; i++){
        s.erase(s.find(v[i-1]-v[i-1-half]));
        s.insert(v[i+half-1]-v[i-1]);
        ans=max(ans, *s.begin());  
    }
    cout << ans;


    return 0;
}

Compilation message (stderr)

hac.cpp: In function 'int main()':
hac.cpp:62:8: warning: variable 'current' set but not used [-Wunused-but-set-variable]
   62 |     pl current = {1e10, 2e10}, amount = {0, 0};
      |        ^~~~~~~
hac.cpp:62:32: warning: variable 'amount' set but not used [-Wunused-but-set-variable]
   62 |     pl current = {1e10, 2e10}, amount = {0, 0};
      |                                ^~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 40 / 40