oj.uz

Submission #314667

# Submission time Handle Problem Language Result Execution time Memory
314667 2020-10-20T16:09:26 Z apostoldaniel854 Election (BOI18_election) C++14
100 / 100
 1466 ms 47560 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
#define pb push_back
#define dbg(x) cerr << #x << " " << x << "\n"

const int N = 5e5;
struct SegTree {
    ///
    struct Node {
        int sum;
        int mnSuf;
    };
    vector <Node> seg;
    int n;
    SegTree (int n) {
        this-> n = n;
        seg.resize (1 + 4 * n);
    }
    Node join (Node lNode, Node rNode) {
        return {lNode.sum + rNode.sum, min (rNode.mnSuf, lNode.mnSuf + rNode.sum)};
    }
    void updatePos (int node, int lb, int rb, int pos, int val) {
        if (lb == rb) {
            seg[node] = {val, min (val, 0)};
            return;
        }
        int mid = (lb + rb) / 2;
        if (pos <= mid)
            updatePos (node * 2, lb, mid, pos, val);
        else
            updatePos (node * 2 + 1, mid + 1, rb, pos, val);
        seg[node] = join (seg[node * 2], seg[node * 2 + 1]);
    }
    Node queryRange (int node, int lb, int rb, int qL, int qR) {
        if (qL <= lb && rb <= qR)
            return seg[node];
        int mid = (lb + rb) / 2;
        Node ans = {0, 0};
        if (qL <= mid)
            ans = join (ans, queryRange (node * 2, lb, mid, qL, qR));
        if (qR >= mid + 1)
            ans = join (ans, queryRange (node * 2 + 1, mid + 1, rb, qL, qR));
        return ans;
    }
};
vector <pair <int, int>> qry[1 + N];
int val[1 + N];

int main () {
    int n;
    string votes;
    cin >> n >> votes;
    for (int i = 0; i < n; i++)
        val[i + 1] = votes[i] == 'C' ? 1 : -1;
    int q;
    cin >> q;
    for (int i = 0; i < q; i++) {
        int l, r;
        cin >> l >> r;
        qry[l].pb ({r, i});
    }
    SegTree seg (n);
    vector <int> stk;
    for (int i = 1; i <= n; i++)
        seg.updatePos (1, 1, n, i, val[i]);
    vector <int> sol (q);
    for (int i = n; i > 0; i--) {
        if (val[i] == 1) {
            if (stk.size ()) {
                seg.updatePos (1, 1, n, stk.back (), -1);
                stk.pop_back ();
            }
        }
        else {
            seg.updatePos (1, 1, n, i, 0);
            stk.push_back (i);
        }
        for (pair <int, int> it : qry[i]) {
            int l = i;
            int r = it.first;
            int index = it.second;
            sol[index] = - seg.queryRange (1, 1, n, l, r).mnSuf + (upper_bound (stk.rbegin (), stk.rend (), r) - stk.rbegin ());
        }
    }
    for (int x : sol)
        cout << x << "\n";
    cout << "\n";
    return 0;
}

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12160 KB Output is correct
2 Correct 12 ms 12160 KB Output is correct
3 Correct 12 ms 12160 KB Output is correct
4 Correct 12 ms 12160 KB Output is correct
5 Correct 12 ms 12160 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12160 KB Output is correct
2 Correct 12 ms 12160 KB Output is correct
3 Correct 12 ms 12160 KB Output is correct
4 Correct 12 ms 12160 KB Output is correct
5 Correct 12 ms 12160 KB Output is correct
6 Correct 166 ms 17024 KB Output is correct
7 Correct 147 ms 16632 KB Output is correct
8 Correct 152 ms 16700 KB Output is correct
9 Correct 154 ms 16908 KB Output is correct
10 Correct 157 ms 17016 KB Output is correct
11 Correct 169 ms 17272 KB Output is correct
12 Correct 165 ms 17144 KB Output is correct
13 Correct 167 ms 17400 KB Output is correct
14 Correct 160 ms 17144 KB Output is correct
15 Correct 159 ms 17168 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12160 KB Output is correct
2 Correct 12 ms 12160 KB Output is correct
3 Correct 12 ms 12160 KB Output is correct
4 Correct 12 ms 12160 KB Output is correct
5 Correct 12 ms 12160 KB Output is correct
6 Correct 166 ms 17024 KB Output is correct
7 Correct 147 ms 16632 KB Output is correct
8 Correct 152 ms 16700 KB Output is correct
9 Correct 154 ms 16908 KB Output is correct
10 Correct 157 ms 17016 KB Output is correct
11 Correct 169 ms 17272 KB Output is correct
12 Correct 165 ms 17144 KB Output is correct
13 Correct 167 ms 17400 KB Output is correct
14 Correct 160 ms 17144 KB Output is correct
15 Correct 159 ms 17168 KB Output is correct
16 Correct 1401 ms 45272 KB Output is correct
17 Correct 1204 ms 41772 KB Output is correct
18 Correct 1305 ms 42540 KB Output is correct
19 Correct 1239 ms 44336 KB Output is correct
20 Correct 1364 ms 44204 KB Output is correct
21 Correct 1466 ms 47152 KB Output is correct
22 Correct 1370 ms 46128 KB Output is correct
23 Correct 1428 ms 47560 KB Output is correct
24 Correct 1377 ms 46596 KB Output is correct
25 Correct 1313 ms 45460 KB Output is correct