Submission #1116348

#	Time	Username	Problem	Language	Result	Execution time	Memory
1116348		staszic_ojuz	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	0 / 100	1053 ms	4940 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;
void upd(vector<int>& tree, int w, int in, int v) {
    in += w;
    tree[in] += v;
    for (in /= 2; in > 0; in /= 2) {
        tree[in] = tree[2 * in] + tree[2 * in + 1];
    }
}
int sum(const vector<int>& tree, int w, int left, int right) {
    int result = 0;
    left += w;
    right += w;
    while (left < right) {
        if (left % 2 == 1) result += tree[left++];
        if (right % 2 == 1) result += tree[--right];
        left /= 2;
        right /= 2;
    }
    return result;
}

int li(vector <int> domy, vector<int> v, int i) {
    return sum(domy, v.size(), 0, i + 1) + v[i];
}
int main() {
    int n, q, s, t, w, l, p, va, p1, p2, l1, l2;
    cin >> n >> q >> s >> t;
    n += 1;
    vector<int> domy(2 * n);
    vector<int> v(n);
    for (int i = 0; i < n; i++) {
        cin >> v[i];
        if (i > 0 && v[i - 1] < v[i]) {
            w -= s * (v[i] - v[i - 1]);
        }
        else if(i > 0 && v[i - 1] > v[i]) {
            w += t * (v[i - 1] - v[i]);
        }
    }
    for (int i = 0; i < q; i++) {
        cin >> l >> p >> va;
        l1 = li(domy, v, l - 1);
        l2 = li(domy, v, l);
        if (l1 < l2) {
            w += s * (l2 - l1);
        }
        else {
            w -= t * (l1 - l2);
        }
        if (p < n - 1) {
            p1 = li(domy, v, p);
            p2 = li(domy, v, p + 1);
            if (p1 < p2) {
                w += s * (p2 - p1);
            }
            else {
                w -= t * (p1 - p2);
            }
        }
        upd(domy, n, l, va);
        if (p < n - 1) {
            upd(domy, n, p + 1, -va);
        }
        l1 = li(domy, v, l - 1);
        l2 = li(domy, v, l);
        if (l1 < l2) {
            w -= s * (l2 - l1);
        }
        else {
            w += t * (l1 - l2);
        }
        if (p < n - 1) {
            p1 = li(domy, v, p);
            p2 = li(domy, v, p + 1);
            if (p1 < p2) {
                w -= s * (p2 - p1);
            }
            else {
                w += t * (p1 - p2);
            }
        }
        cout << w << endl;
    }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:50:15: warning: 'w' may be used uninitialized in this function [-Wmaybe-uninitialized]
   50 |             w -= t * (l1 - l2);
      |             ~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60