Submission #1279548

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279548		ducanh0811	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	17 ms	1988 KiB

Main

#include <bits/stdc++.h>
#define int long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define REV(i, a, b) for (int i = (a), _b = (b); i >= _b; --i)
using namespace std;

#define MAXN 200002
int a[MAXN];
int n;
int sum = 0;

void DQ(int l, int r){
    int fl = l, fr = r;
    while (fl<=fr && a[fl] + sum > a[fl - 1]) a[fl] += sum, fl++;
    while (fl<=fr && a[fr] + sum > a[fr + 1]) a[fr] += sum, fr--;
//    FOR(i, 1, n) cout << a[i] << " \n"[i == n];
//    cout << fl << ' ' << fr << '\n';
    if (fl > fr) {
        if (fl != fr && a[fl] == a[fr]) sum++;
        return;
    }
    int mi = min(a[fl - 1] - a[fl] + 1, a[fr + 1] - a[fr] + 1) - sum;
    sum += mi;
    DQ(fl, fr);
}

void solve(){
    cin >> n;
    FOR(i, 1, n){
        cin >> a[i];
    }
    DQ(1, n);
    cout << sum;
}

#define task "test"
int32_t main(){
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    solve();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:39:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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