Submission #1065593

#	Time	Username	Problem	Language	Result	Execution time	Memory
1065593		CodeLakVN	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	125 ms	14676 KiB

foehn_phenomena

#include <bits/stdc++.h>

#define no "NO"
#define yes "YES"
#define F first
#define S second
#define vec vector
#define task "main"
#define ll long long
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)
#define unq(x) sort(all(x)); x.resize(unique(all(x)) - x.begin())

using namespace std;

template<typename U, typename V> bool maximize(U &a, V b) {
    if (a < b) { a = b; return 1; } return 0;
}
template<typename U, typename V> bool minimize(U &a, V b) {
    if (a > b) { a = b; return 1; } return 0;
}

const int N = (int)2e5 + 9;
const int INF = (int)1e9;
const int MOD = (int)1e9 + 7;

int n, q;
ll s, t, ans = 0;
ll a[N], bit[N], diff[N];
bool f[N];

void update(int idx, ll val) {
    while (idx <= n) {
        bit[idx] += val;
        idx += (idx & -idx);
    }
}

ll get(int idx) {
    ll res = 0;
    while (idx > 0) {
        res += bit[idx];
        idx -= (idx & -idx);
    }
    return res;
}

void update(int l, int r, ll x) {
    ans -= diff[l - 1];
    update(l, x), update(r + 1, -x);

    diff[l - 1] = get(l) - get(l - 1);
    if (diff[l - 1] > 0) diff[l - 1] *= -s;
    else diff[l - 1] *= -t;
    ans += diff[l - 1];

    if (r == n) return;
    ans -= diff[r];
    diff[r] = get(r + 1) - get(r);
    if (diff[r] > 0) diff[r] *= -s;
    else diff[r] *= -t;
    ans += diff[r];
}

void main_code() {
    cin >> n >> q >> s >> t;
    FOR(i, 0, n) cin >> a[i];

    FOR(i, 1, n) update(i, i, a[i]);

    while (q--) {
        int l, r;
        ll x;
        cin >> l >> r >> x;
        update(l, r, x);
        cout << ans << "\n";
    }
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    const bool MULTITEST = 0;
    int num_test = 1; if (MULTITEST) cin >> num_test;
    while (num_test--) { main_code(); cout << "\n"; }
}

/* Lak lu theo dieu nhac */

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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