Submission #1268930

#	Time	Username	Problem	Language	Result	Execution time	Memory
1268930		hoa208	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	15 ms	3500 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
const   ll mod = 1e9 + 7;
const   ll INF = 1e18;
//--------------------------------------------------------------------
const ll N = 2e5 + 10;
ll n, a[N], b[N];
void hbmt() {
    cin >> n;
    FOR(i, 1, n) {
        cin >> a[i];
    }
    ll pre = a[1];
    FOR(i, 2, n) {
        ll k = pre - a[i] + 1;
        k = max(0LL, k);
        b[i] = b[i - 1] + k;
        pre = a[i];
    }
    ll ans = b[n];
    pre = a[n];
    ll cnt = 0;
    FORD(i, n - 1, 1) {
        ll k = pre - a[i] + 1;
        k = max(0LL, k);
        cnt += k;
        ans = min(ans, max(cnt, b[i]));
        pre = a[i];
    }
    cout << ans;
}

int main() {
    
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);

    #define NAME "hbmt"
    if(fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    
    //int t;cin>>t;while(t--)
    hbmt();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:47:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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