Submission #902763

#	Time	Username	Problem	Language	Result	Execution time	Memory
902763		May27_th	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	28 ms	7528 KiB

Main

#include <bits/stdc++.h>
#define int64_t long long
#define double long double
using namespace std;
using type = int64_t;
const long long mod = 1000000007, inf = 1e18;
const int base = 33;
const int N = 3e5 + 10;
const int LG = 20;

int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};

int n; int64_t a[N], lf[N], rg[N];
void Solve()
{
    cin >> n;
    for(int i = 1; i <= n; i ++) cin >> a[i];
    for(int i = 1; i <= n; i ++){
        lf[i] = lf[i - 1] + max(0LL, a[i - 1] + 1 - a[i]);
    }
    for(int i = n; i >= 1; i --){
        rg[i] = rg[i + 1] + max(0LL, a[i + 1] + 1 - a[i]);
    }
    /*for(int i = 1; i <= n; i ++) cout << lf[i] << " ";
    cout << "\n";
    for(int i = 1; i <= n; i ++) cout << rg[i] << " ";
    cout << "\n";*/
    int64_t ans = inf;
    for(int i = 1; i <= n; i ++){
        ans = min(ans, max(lf[i], rg[i]));
    }
    cout << ans;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    if(fopen("guard.in", "r")){
        freopen("guard.in", "r", stdin);
        freopen("guard.out", "w", stdout);
    }
    if(fopen("A.inp", "r")){
        freopen("A.inp", "r", stdin);
        freopen("A.out", "w", stdout);
    }
    int tc = 1;
    //cin >> tc;
    while(tc --){
        Solve();
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen("guard.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen("guard.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen("A.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
Main.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         freopen("A.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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