제출 #1291643

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1291643		anhphant	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	512 ms	16424 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll N, Q, S, T, A[200007];

namespace ST {
    ll ST[800007], lazy[800007];

    void push_down(ll id) {
        ST[id * 2] += lazy[id];
        ST[id * 2 + 1] += lazy[id];
        lazy[id * 2] += lazy[id];
        lazy[id * 2 + 1] += lazy[id];
        lazy[id] = 0;
    }

    void update(ll id, ll l, ll r, ll L, ll R, ll x) {
        if (r < L || R < l) return;
        if (L <= l && r <= R) {
            ST[id] += x;
            lazy[id] += x;
            return;
        }
        ll mid = (l + r) / 2;
        push_down(id);
        update(id * 2, l, mid, L, R, x);
        update(id * 2 + 1, mid + 1, r, L, R, x);
        ST[id] = max(ST[id * 2], ST[id * 2 + 1]);
    }

    ll getans(ll id, ll l, ll r, ll L, ll R) {
        if (R == 0) return 0;
        if (r < L || R < l) return -1e18;
        if (L <= l && r <= R) return ST[id];
        ll mid = (l + r) / 2;
        push_down(id);
        return max(getans(id * 2, l, mid, L, R), getans(id * 2 + 1, mid + 1, r, L, R));
    }
}

ll temper;

int main() {
    ios_base :: sync_with_stdio(0);
    cin.tie(0); cout.tie(0); cerr.tie(0);
    if (fopen("test.inp", "r")) {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }

    for(int i = 0; i <= 800000; ++i) ST::ST[i] = 0;

    cin >> N >> Q >> S >> T;
    cin >> A[0];
    for(int i = 1; i <= N; ++i) {
        cin >> A[i];
        temper += (A[i - 1] < A[i]? -S * (A[i] - A[i - 1]) : T * (A[i - 1] - A[i]));
        ST::update(1, 1, N, i, i, A[i]);
    }

    for(int i = 1; i <= Q; ++i) {
        ll l, r, x;
        cin >> l >> r >> x;
        ll x1, x2;
        x1 = ST::getans(1, 1, N, l - 1, l - 1);
        x2 = ST::getans(1, 1, N, l, l);
        temper -= (x1 < x2? -S * (x2 - x1) : T * (x1 - x2));
        if (r != N) {
            x1 = ST::getans(1, 1, N, r, r);
            x2 = ST::getans(1, 1, N, r + 1, r + 1);
            temper -= (x1 < x2? -S * (x2 - x1) : T * (x1 - x2));
        }

        ST::update(1, 1, N, l, r, x);

        x1 = ST::getans(1, 1, N, l - 1, l - 1);
        x2 = ST::getans(1, 1, N, l, l);
        temper += (x1 < x2? -S * (x2 - x1) : T * (x1 - x2));
        //cerr << "i = " << x1 << " " << x2 << " " << -S * (x2 - x1) << " : " << i << " : " << temper << '\n';
        if (r != N) {
            x1 = ST::getans(1, 1, N, r, r);
            x2 = ST::getans(1, 1, N, r + 1, r + 1);
            temper += (x1 < x2? -S * (x2 - x1) : T * (x1 - x2));
        }

        cout << temper << '\n';
    }
}

컴파일 시 표준 에러 (stderr) 메시지

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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