Submission #701881

#	Time	Username	Problem	Language	Result	Execution time	Memory
701881		Do_you_copy	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	277 ms	35788 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
#define pb push_back

using namespace std;
using ll = long long;
using pii = pair <int, int>;

const int maxN = 2e5 + 10;
const int inf = 0x3f3f3f3f;
//const int Mod =
int n, q, s, t;

int a[maxN];

struct TNode{
    ll val, l, r, lazy;
    TNode(){
        val = l = r = lazy = 0;
    }
    TNode(ll _val, int _l, int _r, int _lazy){
        val = _val;
        l = _l;
        r = _r;
        lazy = _lazy;
    }
    TNode(TNode x, TNode y){
        l = x.l;
        r = y.r;
        lazy = 0;
        val = x.val + y.val;
        if (x.r < y.l) val -= 1LL * (y.l - x.r) * s;
        else val += 1LL * (x.r - y.l) * t;
    }
};
TNode st[maxN * 4];

void push(int id){
    if (st[id].lazy){
        st[id << 1].lazy += st[id].lazy;
        st[id << 1 | 1].lazy += st[id].lazy;
        st[id << 1].l += st[id].lazy;
        st[id << 1].r += st[id].lazy;
        st[id << 1 | 1].l += st[id].lazy;
        st[id << 1 | 1].r += st[id].lazy;
        st[id].lazy = 0;
    }
}
void build(int id = 1, int l = 1, int r = n){
    if (l == r){
        st[id] = {0, a[l], a[l], 0};
        return;
    }
    int mid = (l + r) >> 1;
    build(id << 1, l, mid);
    build(id << 1 | 1, mid + 1, r);
    st[id] = TNode(st[id << 1], st[id << 1 | 1]);
}

void update(int id, int i, int j, int x, int l = 1, int r = n){
    if (i > r || l > j) return;
    if (i <= l && r <= j){
        st[id].l += x;
        st[id].r += x;
        st[id].lazy += x;
        return;
    }
    int mid = (l + r) >> 1;
    push(id);
    update(id << 1, i, j, x, l, mid);
    update(id << 1 | 1, i, j, x, mid + 1, r);
    st[id] = TNode(st[id << 1], st[id << 1 | 1]);
}

void Init(){
    cin >> n >> q >> s >> t;
    ++n;
    for (int i = 1; i <= n; ++i) cin >> a[i];
    build();
    for (int i = 1; i <= q; ++i){
        int l, r, x;
        cin >> l >> r >> x;
        update(1, l + 1, r + 1, x);
        cout << st[1].val << "\n";
    }
}

#define taskname "test"
signed main(){
    faster
    if (fopen(taskname ".inp", "r")){
        freopen(taskname ".inp", "r", stdin);
        freopen(taskname ".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
    }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:94:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         freopen(taskname ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:95:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |         freopen(taskname ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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