Submission #1279409

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279409		ducanh0811	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	0 / 100	1 ms	572 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 pref[MAXN];
int suff[MAXN];
int lastpre[MAXN];
int lastsuf[MAXN];
int a[MAXN];
int b[MAXN];
int n;

void solve(){
    cin >> n;
    FOR(i, 1, n){
        cin >> a[i];
        b[i] = a[i];
    }
    int sum = 0;
    FOR(i, 2, n){
        b[i] += sum;
        pref[i] += pref[i - 1];
        lastpre[i] = lastpre[i - 1];
        if (b[i] <= b[i - 1]){
            int val = (b[i - 1] - b[i] + 1);
            b[i] += val;
            sum += val;
            pref[i] += val;
            lastpre[i] = val;
        }
    }
    FOR(i, 1, n) b[i] = a[i];
    sum = 0;
    REV(i, n - 1, 1){
        b[i] += sum;
        suff[i] += suff[i + 1];
        lastsuf[i] = lastsuf[i + 1];
        if (b[i] <= b[i + 1]) {
            int val = (b[i + 1] - b[i] + 1);
            b[i] += val;
            sum += val;
            suff[i] += val;
            lastsuf[i] = val;
        }
    }
    int res = 1e15;
    FOR(i, 1, n - 1){
        res = min(res, pref[i] + suff[i + 1] - min(lastpre[i], lastsuf[i + 1]));
    }
    cout << res;
}

#define task ""
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:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 40
• Subtask 2: 0 / 60