제출 #1126785

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1126785		nguyenvuminh0907	원숭이와 사과 나무 (IZhO12_apple)	C++20	0 / 100	0 ms	320 KiB

apple

#include <bits/stdc++.h>
#define endl "\n"
using namespace std;

int n;

struct Node{
    int l, r, sum, lazy;
    Node *leftChild, *rightChild;

    Node(int ql, int qr){
        l = ql; r = qr;
        sum = lazy = 0;
        leftChild = rightChild = nullptr;
    }
} *root;

struct SegmentTree{
    void pass(Node *currNode){
        int l = (currNode -> l), r = (currNode -> r);
        if (currNode -> lazy == 0) return;
        if (l == r) return;

        int mid = (l + r) / 2;
        if (currNode -> leftChild == nullptr) currNode -> leftChild = new Node(l, mid);
        if (currNode -> rightChild == nullptr) currNode -> rightChild = new Node(mid + 1, r);

        Node *leftChild = currNode -> leftChild;
        Node *rightChild = currNode -> rightChild;

        (leftChild -> l) = l; (leftChild -> r) = mid;
        (rightChild -> l) = mid + 1; (rightChild -> r) = r;

        (leftChild -> sum) = (leftChild -> lazy) = mid - l + 1;
        (rightChild -> sum) = (rightChild -> lazy) = r - mid;
    }

    void update(int ql, int qr, Node *currNode = root){
        int l = (currNode -> l), r = (currNode -> r);
        if ((qr < l) || (r < ql)) return;
        if ((ql <= l) && (r <= qr)){
            (currNode -> sum) = (currNode -> lazy) = r - l + 1;
            return;
        }

        int mid = (l + r) / 2;
        pass(currNode);

        if (currNode -> leftChild == nullptr) currNode -> leftChild = new Node(l, mid);
        if (currNode -> rightChild == nullptr) currNode -> rightChild = new Node(mid + 1, r);

        update(ql, qr, currNode -> leftChild);
        update(ql, qr, currNode -> rightChild);
        (currNode -> sum) = (currNode -> leftChild -> sum) + (currNode -> rightChild -> sum);
    }

    int query(int ql, int qr, Node *currNode = root){
        int l = (currNode -> l), r = (currNode -> r);
        if ((qr < l) || (r < ql)) return 0;
        if ((ql <= l) && (r <= qr)) return (currNode -> sum);

        pass(currNode);

        int lhs = 0, rhs = 0;
        if (currNode -> leftChild != nullptr) lhs = query(ql, qr, currNode -> leftChild);
        if (currNode -> rightChild != nullptr) rhs = query(ql, qr, currNode -> rightChild);

        return lhs + rhs;
    }
} tree;

signed main(){
    cin.tie(0) -> sync_with_stdio(0);

    #define FILENAME "f"
    if (fopen(FILENAME".in","r")){
        freopen(FILENAME".in","r",stdin);
        freopen(FILENAME".out","w",stdout);
    }

    int q, tau = 1;
    cin >> q;
    
    root = new Node(1, n);
    n = 1'000'000'000;

    int c = 0;
    while (q--){
        int d, x, y;
        cin >> d >> x >> y;
        int l = x + tau * c, r = y + tau * c;

        if (d == 1){
            c = tree.query(l, r);
            cout << c << endl;
        }
        else tree.update(l, r);
    }
}

컴파일 시 표준 에러 (stderr) 메시지

apple.cpp: In function 'int main()':
apple.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(FILENAME".in","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
apple.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(FILENAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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