Submission #1241368

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241368		Geforgs	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	0 / 100	0 ms	328 KiB

Main

#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <queue>
#include <map>
#include <unordered_map>
#include <stack>
#include <bitset>
#include <string>
#include <cstring>
#include <iterator>
#include <random>
#define ll long long
#define ld long double
#define inf (ll)(2*1e18)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define pb push_back
#define endl "\n"
using namespace std;

void solve(){
    ll n, i, l, r, res=0, k;
    cin>>n;
    vector<ll> a(n);
    vector<ll> b(n);
    vector<ll> c(n);
    for(i=0;i<n;++i){
        cin>>a[i];
    }
    for(i=1;i<n;++i){
        b[i] = a[i] - a[i-1] - 1;
    }
    for(i=n-2;i>=0;--i){
        c[i] = a[i] - a[i+1] - 1;
    }
    l = 1;
    r = n-1;
    while(l < n and b[l] >= 0){
        ++l;
    }
    while(r >= 0 and c[r] >= 0){
        --r;
    }
    while(l <= r){
        if(l == r){
            res += max({0ll, -b[l], -c[r]});
            break;
        }else if(l+1 == r){
            res += max({0ll, -b[l], -c[r]});
            ++l;
            --r;
            break;
        }
        k = min(-b[l], -c[r]);
        res += k;
        b[l] += k;
        c[r] += k;
        while(l < n and b[l] >= 0){
            ++l;
        }
        while(r >= 0 and c[r] >= 0){
            --r;
        }
    }
    if(l < n and r >= 0 and a[l] == a[r]) ++res;
    cout<<res<<endl;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    srand(time(nullptr));
    ll t=1;
//    cin>>t;
    for(;t>0;--t){
        solve();
    }
    return 0;
}

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