Submission #1124374

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124374		tuannm	Safety (NOI18_safety)	C++20	100 / 100	44 ms	4452 KiB

safety

#include<bits/stdc++.h>
#define ii pair<int, int>
#define ll pair<long long, long long>
#define fi first
#define se second
#define pb push_back
using namespace std;
const int mod[2] = {1000000007, 998244353};
const int N = 2e5 + 1;
const string NAME = "";
int n, h, s[N];

void inp(){
    cin >> n >> h;

    for(int i = 1; i <= n; ++i)
        cin >> s[i];
}

void solve(){
    priority_queue<long long> pqL, pqR;
    long long ans = 0;

    pqL.push(s[1]);
    pqR.push(-s[1]);

    for(int i = 2; i <= n; ++i){
        long long cost = 1LL * h * (i - 1);
        long long leftBound = pqL.top() - cost;
        long long rightBound = cost - pqR.top();

        if(s[i] < leftBound){
            pqL.push(cost + s[i]);
            pqL.push(cost + s[i]);
            pqL.pop();

            pqR.push(cost - leftBound);
            ans += abs(leftBound - s[i]);
        }
        else if(s[i] > rightBound){
            pqR.push(cost - s[i]);
            pqR.push(cost - s[i]);
            pqR.pop();

            pqL.push(cost + rightBound);
            ans += abs(rightBound - s[i]);
        }
        else{
            pqL.push(cost + s[i]);
            pqR.push(cost - s[i]);
        }
    }

    cout << ans;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

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

    inp();
    solve();
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen((NAME + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
safety.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen((NAME + ".out").c_str(), "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