Submission #1279936

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279936		mactoddlover	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	16 ms	4344 KiB

Main

#include<bits/stdc++.h>

#define MASK(i) (1 << (i))
#define pub push_back
#define all(v) v.begin(), v.end()
#define compact(v) v.erase(unique(all(v)), end(v))
#define pii pair<int,int>
#define fi first
#define se second
#define endl "\n"
#define sz(v) (int)(v).size()
#define dbg(x) "[" #x " = " << (x) << "]"
#define vi vector<int>

using namespace std;
bool START_ALLOC;

template<class T> bool minimize(T& a, T b){if(a > b) return a = b, true;return false;}
template<class T> bool maximize(T& a, T b){if(a < b) return a = b, true;return false;}

typedef long long ll;
typedef long double ld;

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r){return uniform_int_distribution<ll>(l, r)(rng);}

const int MAX = 2e5 + 15;

int n;
int a[MAX];
ll pref[MAX], suff[MAX];

void solve(){
    cin >> n;

    for(int i = 1; i <= n; i++) cin >> a[i];

    for(int i = 2; i <= n; i++){
        pref[i] = pref[i-1] + max(0, a[i-1] - a[i] + 1);
    }

    for(int i = n-1; i >= 1; i--){
        suff[i] = suff[i+1] + max(0, a[i+1] - a[i] + 1);
    }

    ll answer = LLONG_MAX;

    for(int i = 1; i <= n; i++) minimize(answer, max(pref[i], suff[i]));

    cout << answer << endl;
}

bool END_ALLOC;
signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(0); cout.tie(0);

    #define task "task"

    cerr << "[Static Memory : " << fixed << setprecision(2) << (((&END_ALLOC) - (&START_ALLOC)) / (1024.0 * 1024.0)) << "mb]\n";
    if(fopen(task".INP", "r")){
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

    int t; t = 1; //cin >> t;
    while(t--) solve();
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 40 / 40
• Subtask 2: 60 / 60