Submission #891264

#	Time	Username	Problem	Language	Result	Execution time	Memory
891264		Tien_Noob	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	137 ms	12416 KiB

foehn_phenomena

//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
using namespace std;
const int N = 2e5;
int a[N + 1], n, q;
long long res, s, t;
struct FenwickTree
{
    long long tree[N + 1];
    void add(int pos, int val)
    {
        for (; pos <= n; pos |= pos + 1)
        {
            tree[pos] += val;
        }
    }
    void add(int l, int r, int val)
    {
        add(l, val);
        add(r + 1, - val);
    }
    long long get(int pos)
    {
        long long ret = a[pos];
        for (; pos >= 0; pos = (pos & (pos + 1)) - 1)
        {
            ret += tree[pos];
        }
        return ret;
    }
} tree;
void read()
{
    cin >> n >> q >> s >> t;
    for (int i = 0; i <= n; ++ i)
    {
        cin >> a[i];
        if (i == 0)
        {
            continue;
        }
        if (a[i - 1] < a[i])
        {
            res += (a[i] - a[i - 1]) * s;
        }
        else
        {
            res -= (a[i - 1] - a[i]) * t;
        }
    }
}
long long val(int i)
{
    long long x = tree.get(i), y = tree.get(i + 1);
    if (x < y)
    {
        return (y - x) * s;
    }
    else
    {
        return (y - x) * t;
    }
}
void solve()
{
    while(q--)
    {
        int l, r, x;
        cin >> l >> r >> x;
        if (r < n)
        {
            res -= val(r);
        }
        res -= val(l - 1);
        tree.add(l, r, x);
        if (r < n)
        {
            res += val(r);
        }
        res += val(l - 1);
        cout << -res << '\n';
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }
    int t = 1;
    bool typetest = false;
    if (typetest)
    {
        cin >> t;
    }
    for (int __ = 1; __ <= t; ++ __)
    {
        //cout << "Case " << __ << ": ";
        read();
        solve();
    }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:92:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60