Submission #889460

#	Time	Username	Problem	Language	Result	Execution time	Memory
889460		uped	Sails (IOI07_sails)	C++17	100 / 100	433 ms	6484 KiB

sails

#include <bits/stdc++.h>

using namespace std;

#define DEBUG(a) cout << #a << ": " << a << '\n';

using ll = long long;

struct lazy_segtree {
    using T = ll;
    using U = ll;
    T value_identity = 0ll;
    U operation_identity = 0ll;
    U compose(U a, U b) {
        return a + b;
    }

    T apply(T a, U b, int n) {
        return a + b * n;
    }

    T combine(T a, T b) {
        return a + b;
    }

    int size;
    vector<T> tree;
    vector<U> operations;
    lazy_segtree(int n) {
        size = 1;
        while (size < n) size *= 2;
        tree.assign(2 * size, value_identity);
        operations.assign(2 * size, operation_identity);
    }

    void propagate(int x, int lx, int rx) {
        if (rx - lx == 1) {
            return;
        }

        int m = (lx + rx) / 2;
        operations[2 * x + 1] = compose(operations[2 * x + 1], operations[x]);
        operations[2 * x + 2] = compose(operations[2 * x + 2], operations[x]);
        tree[2 * x + 1] = apply(tree[2 * x + 1], operations[x], m - lx);
        tree[2 * x + 2] = apply(tree[2 * x + 2], operations[x], rx - m);
        operations[x] = operation_identity;
    }

    void modify(int l, int r, int v, int x, int lx, int rx) {
        propagate(x, lx, rx);
        if (lx >= r || rx <= l) return;
        if (l <= lx && rx <= r) {
            operations[x] = compose(operations[x], v);
            tree[x] = apply(tree[x], v, rx - lx);
            return;
        }
        int m = (lx + rx) / 2;
        modify(l, r, v, 2 * x + 1, lx, m);
        modify(l, r, v, 2 * x + 2, m, rx);
        tree[x] = combine(tree[2 * x + 1], tree[2 * x + 2]);
    }

    void modify(int l, int r, int v) {
        modify(l, r, v, 0, 0, size);
    }

    T query(int l, int r, int x, int lx, int rx) {
        propagate(x, lx, rx);
        if (lx >= r || rx <= l) return value_identity;
        if (l <= lx && rx <= r) {
            return tree[x];
        }
        int m = (lx + rx) / 2;
        T a = query(l, r, 2 * x + 1, lx, m);
        T b = query(l, r, 2 * x + 2, m, rx);
        return combine(a, b);
    }

    T query(int l, int r) {
      return query(l, r, 0, 0, size);  
    }

    T query(int i, int x, int lx, int rx) {
        propagate(x, lx, rx);
        if (rx - lx == 1) {
            return tree[x];
        }
        int m = (lx + rx) / 2;
        if (i < m) {
            return query(i, 2 * x + 1, lx, m);
        } else {
            return query(i, 2 * x + 2, m, rx);
        }
    }

    T query(int i) {
        return query(i, 0, 0, size);
    }

    void build(vector<T>& v, int x, int lx, int rx) {
        if (rx - lx == 1) {
            if (lx < v.size()) {
                tree[x] = v[lx];
            }
            return;
        }
        int m = (lx + rx) / 2;
        build(v, 2 * x + 1, lx, m);
        build(v, 2 * x + 2, m, rx);
        tree[x] = combine(tree[2 * x + 1], tree[2 * x + 2]);
    }

    void build(vector<T>& v) {
        build(v, 0, 0, size);
    }
};

const int max_n = 1e5;

int lower_bnd(lazy_segtree& st, int x) {
    int l = -1, r = max_n;
    while (r > l + 1) {
        int mid = (l + r) / 2;
        if (st.query(mid) >= x) {
            r = mid;
        } else {
            l = mid;
        }
    }
    return r;
}

int main() {
    int n;
    cin >> n;
    vector<pair<int, int>> v(n);
    for (int i = 0; i < n; ++i) {
        cin >> v[i].first >> v[i].second;
    }
    lazy_segtree st(max_n);
    sort(v.begin(), v.end());
    for (auto& [h, s] : v) {
        int left = max_n - h;
        int right = left + s;
        //DEBUG(left);
        //DEBUG(right);
        if (right < max_n && st.query(right) == st.query(right - 1)) {
            int right_value = st.query(right);
            //DEBUG(right_value)
            int after = lower_bnd(st, right_value + 1);
            int first = lower_bnd(st, right_value);
            //DEBUG(after);
            //DEBUG(first);
            
            int x = s - abs(left - first);
            if (left > first) {
                x = s;    
            } else {
                st.modify(left, first, 1);
            }
            //DEBUG(x);
            st.modify(after - x, after, 1);
        } else {
            st.modify(left, right, 1);
        }
    }
    ll ans = 0;
    for (int i = 0; i < max_n; ++i) {
        long long a = st.query(i);
        //if (a > 0) DEBUG(a);
        ans += (a * (a - 1)) / 2;
    }
    cout << ans;
}

Compilation message (stderr)

sails.cpp: In member function 'void lazy_segtree::build(std::vector<long long int>&, int, int, int)':
sails.cpp:102:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |             if (lx < v.size()) {
      |                 ~~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10