Submission #1140303

#	Time	Username	Problem	Language	Result	Execution time	Memory
1140303		goatmar	송신탑 (IOI22_towers)	C++20	Compilation error	0 ms	0 KiB

towers

#include <vector>
#include <algorithm>
#include <iostream>
#include <climits>

using namespace std;

vector<int> H;
int N;

// Segment Tree for Range Maximum Query (RMQ)
class SegmentTree {
private:
    vector<int> tree;
    int n;

    void build(int node, int start, int end) {
        if (start == end) {
            tree[node] = H[start];
        } else {
            int mid = (start + end) / 2;
            build(2 * node, start, mid);
            build(2 * node + 1, mid + 1, end);
            tree[node] = max(tree[2 * node], tree[2 * node + 1]);
        }
    }

    int query(int node, int start, int end, int l, int r) {
        if (r < start || l > end) {
            return INT_MIN;
        }
        if (l <= start && end <= r) {
            return tree[node];
        }
        int mid = (start + end) / 2;
        int left = query(2 * node, start, mid, l, r);
        int right = query(2 * node + 1, mid + 1, end, l, r);
        return max(left, right);
    }

public:
    SegmentTree(int size) {
        n = size;
        tree.resize(4 * n);
        build(1, 0, n - 1);
    }

    int getMax(int l, int r) {
        return query(1, 0, n - 1, l, r);
    }
};

SegmentTree* st;

void init(int N, vector<int> H) {
    ::N = N;
    ::H = H;
    st = new SegmentTree(N);
}

int max_towers(int L, int R, int D) {
    int maxH = st->getMax(L, R);
    int count = 0;
    int last = -1;

    for (int i = L; i <= R; ++i) {
        if (H[i] <= maxH - D) {
            if (last == -1 || H[i] >= H[last]) {
                last = i;
                count++;
            }
        }
    }

    return count;
}

int main() {
    // Example usage
    init(7, {10, 20, 60, 40, 50, 30, 70});
    cout << max_towers(1, 5, 10) << endl; // Output: 3
    cout << max_towers(2, 2, 100) << endl; // Output: 1
    cout << max_towers(0, 6, 17) << endl; // Output: 2

    // Clean up
    delete st;

    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccswtGiv.o: in function `main':
stub.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccvQzRtv.o:towers.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status