Submission #1192463

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192463		Boycl07	Safety (NOI18_safety)	C++20	100 / 100	34 ms	4456 KiB

safety

#include <bits/stdc++.h>
#include <clocale>
#include <queue>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define rep(i, n) for(int i = 1; (i) <= (n); ++i)
#define forn(i, l, r) for(int i = (l); i <= (r); ++i)
#define ford(i, r, l) for(int i = (r); i >= (l); --i)
#define FOR(i, n) for(int i = 0; i < (n); ++i)
#define FORD(i, n) for(int i = ((n) - 1); i >= 0; --i)
#define fi first
#define se second
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define endl "\n"
#define task "note"
#define sz(a) int(a.size())
#define C(x, y) make_pair(x, y)
#define all(a) (a).begin(), (a).end()
#define bit(i, mask) (mask >> i & 1)

template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }

inline int readInt()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();int n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline ll readLong()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();ll  n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline string readString() {char c;while(c=getchar(),c==' '||c=='\n'||c=='\t');string s({c});while(c=getchar(),c!=EOF&&c!=' '&&c!='\n'&&c!='\t')s+=c;return s;}

const int N = 5e5 + 3;
const int M = 5e3 + 100;
const int LIM = 5e5 + 3;
const int LOG = 16;
const int MOD = 1e9 + 7;
const int INF = 1e9 + 33;
const ll LINF = 1e18 + 33;
const int S =  1e5;
int n, h;
int a[N];
priority_queue<ll> left_hull;
priority_queue<ll, vector<ll>, greater<ll>> right_hull;


void solve()
{
    cin >> n >> h;
    rep(i, n) cin >> a[i];

    ll res = 0;
    left_hull.push(a[1]);
    right_hull.push(a[1]);
    ll shift = 0;
    forn(i, 2, n)
    {
        shift += h;

        ll lb = left_hull.top() - shift;
        ll rb = right_hull.top() + shift;
        ll x = a[i];
        
        if(x < lb)
        {
            left_hull.push(x + shift);
            left_hull.push(x + shift);
            res -= x;
            res += lb;
            right_hull.push(lb - shift);
            left_hull.pop();
        }
        else if(x > rb)
        {
            right_hull.push(x - shift);
            right_hull.push(x - shift);
            res += x;
            res -= rb;
            left_hull.push(rb + shift);
            right_hull.pop();
        }
        else
        {
            left_hull.push(x + shift);
            right_hull.push(x - shift);
        }
    }
    cout << res;
}
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    int TC = 1;

    if(fopen(task".inp", "r"))
    {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }


    while(TC--)
    {
        solve();
    }

    return 0;
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:99:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
safety.cpp:100:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  100 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 9 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 22 / 22
• Subtask 9: 29 / 29