Submission #546222

#	Time	Username	Problem	Language	Result	Execution time	Memory
546222		Ooops_sorry	Street Lamps (APIO19_street_lamps)	C++14	100 / 100	2779 ms	187176 KiB

street_lamps

#include<bits/stdc++.h>

using namespace std;

#define int long long
#define pb push_back
#define ld double
#define ll __int128

mt19937 rnd(51);

const int N = 3e5 + 10;
vector<int> arr[N];

struct Fenwick {
    vector<int> t;
    void build(int n) {
        t.resize(n);
    }
    void inc(int i, int d) {
        for (; i < t.size(); i = (i | (i + 1))) {
            t[i] += d;
        }
    }
    int get(int r) {
        int ans = 0;
        for (; r >= 0; r = (r & (r + 1)) - 1) {
            ans += t[r];
        }
        return ans;
    }
} t[N];

void fake_add(int i, int j) {
    for (; i < N; i = (i | (i + 1))) {
        arr[i].pb(j);
    }
}

void add(int i, int j, int val) {
    for (; i < N; i = (i | (i + 1))) {
        int ind = lower_bound(arr[i].begin(), arr[i].end(), j) - arr[i].begin();
        t[i].inc(ind, val);
    }
}

int get(int i, int j) {
    int ans = 0;
    for (; i >= 0; i = (i & (i + 1)) - 1) {
        int ind = upper_bound(arr[i].begin(), arr[i].end(), j) - arr[i].begin() - 1;
        ans += t[i].get(ind);
    }
    return ans;
}

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif // LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    vector<int> s(n);
    set<int> st{-1, n};
    for (int i = 0; i < n; i++) {
        char c;
        cin >> c;
        s[i] = c - '0';
        if (s[i] == 0) {
            st.insert(i);
        }
    }
    vector<vector<int>> u;
    for (int i = 0; i < q; i++) {
        string t;
        cin >> t;
        if (t == "toggle") {
            int j;
            cin >> j;
            j--;
            if (st.find(j) == st.end()) {
                auto l = *prev(st.lower_bound(j)) + 1, r = *st.upper_bound(j) - 1;
                u.pb({l, r, i + 1, j});
                fake_add(l, j);
                fake_add(l, r + 1);
                fake_add(j + 1, j);
                fake_add(j + 1, r + 1);
                st.insert(j);
            } else {
                st.erase(j);
                auto l = *prev(st.lower_bound(j)) + 1, r = *st.upper_bound(j) - 1;
                u.pb({l, r, -(i + 1), j});
                fake_add(l, j);
                fake_add(l, r + 1);
                fake_add(j + 1, j);
                fake_add(j + 1, r + 1);
            }
        } else {
            int l, r;
            cin >> l >> r;
            l--, r -= 2;
            auto val = *st.lower_bound(l);
            if (val > r) {
                u.pb({l, r, 1});
            } else {
                u.pb({l, r, 0});
            }
        }
    }
    for (int i = 0; i < N; i++) {
        sort(arr[i].begin(), arr[i].end());
        arr[i].erase(unique(arr[i].begin(), arr[i].end()), arr[i].end());
        t[i].build(arr[i].size());
    }
    for (int i = 0; i < u.size(); i++) {
        if (u[i].size() == 3) {
            int l = u[i][0], r = u[i][1];
            cout << get(l, r) + (i + 1) * u[i][2] << endl;
        } else {
            int l = u[i][0], r = u[i][1], val = u[i][2], j = u[i][3];
            add(l, j, val);
            add(l, r + 1, -val);
            add(j + 1, j, -val);
            add(j + 1, r + 1, val);
        }
    }
    return 0;
}

Compilation message (stderr)

street_lamps.cpp: In member function 'void Fenwick::inc(long long int, long long int)':
street_lamps.cpp:21:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         for (; i < t.size(); i = (i | (i + 1))) {
      |                ~~^~~~~~~~~~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:116:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  116 |     for (int i = 0; i < u.size(); i++) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20