oj.uz

Submission #418762

# Submission time Handle Problem Language Result Execution time Memory
418762 2021-06-05T20:16:59 Z timg8710 Election (BOI18_election) C++17
100 / 100
 1493 ms 97128 KB 
//Author: timg8710

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef pair<ll, int> pii;
 
#define pb push_back
 
#define f first
#define s second

struct node{
    int sum, l, r, res;
    node(int v){
        sum = v;
        l = r = res = min(0, v);
    }
    node(){
        sum = l = r = res = 0;
    }
    node comb(node& other){
        node h;
        h.sum = sum + other.sum;
        h.l = min(l, sum + other.l);
        h.r = min(other.r, other.sum + r);
        h.res = min({l + other.r, sum + other.res, res + other.sum});
        return h;
    }
};

template <typename T>
struct segtree
{
    T none; //comb(a, none) = a

    T val;
    int gL, gR, mid;
    segtree<T> *left;
    segtree<T> *right;

    T comb(T& l, T& r)
    {
        return l.comb(r);
    }

    segtree(int l, int r, T arr[], T non)
    { //modify arr type
        none = non;
        gL = l; gR = r; mid = (gL+gR)/2;
        if (l == r)
        {
            val = arr[l];
        }
        else
        {
            left = new segtree<T>(l, mid, arr, non); right = new segtree<T>(mid + 1, r, arr, non);
            val = comb(
                left->val, right->val);
        }
        // cout << l << " " << r << " ";
        // cout << val.l <<  " "<< val.r << " " << val.fr << endl;
    }

    T query(int l, int r)
    {

        if (gL > r || gR < l)
        {
            return none;
        }

        if (gL == l && gR == r)
        {
            return val;
        }
        T a = left->query(l, min(r, mid)); T b = right->query(max(l, mid + 1), r);
        return comb(a, b); //might be wrong
    }

    void update(int idx, T set)
    {
        if (gL == gR)
        {
            val = set;
        }
        else
        {
            if (idx <= (gL + gR) / 2)
            {
                left->update(idx, set);
            }
            else
            {
                right->update(idx, set);
            }
            val = comb(left->val, right->val);
        }
   }
};

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0);

    int n, q, u, v;
    char c;
    cin >> n;
    node nums[n];
    for(int i = 0; i<n; i++) {
        cin >> c; 
        nums[i] = node((c == 'T' ? -1 : 1));
    }
    cin >> q;
    segtree<node> sgt(0,n-1, nums, node());
    while(q--){
        cin >> u; cin >> v;
        // cout << res.l <<  " "<< res.r << " " << res.fr << endl;
        cout << -(sgt.query(u-1, v-1).res) << "\n";
    }
    return 0;
}

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 580 KB Output is correct
2 Correct 2 ms 588 KB Output is correct
3 Correct 2 ms 572 KB Output is correct
4 Correct 3 ms 572 KB Output is correct
5 Correct 2 ms 576 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 580 KB Output is correct
2 Correct 2 ms 588 KB Output is correct
3 Correct 2 ms 572 KB Output is correct
4 Correct 3 ms 572 KB Output is correct
5 Correct 2 ms 576 KB Output is correct
6 Correct 130 ms 13548 KB Output is correct
7 Correct 75 ms 13496 KB Output is correct
8 Correct 94 ms 13468 KB Output is correct
9 Correct 92 ms 13376 KB Output is correct
10 Correct 103 ms 13400 KB Output is correct
11 Correct 102 ms 13504 KB Output is correct
12 Correct 117 ms 13556 KB Output is correct
13 Correct 126 ms 13700 KB Output is correct
14 Correct 126 ms 13492 KB Output is correct
15 Correct 124 ms 13504 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 580 KB Output is correct
2 Correct 2 ms 588 KB Output is correct
3 Correct 2 ms 572 KB Output is correct
4 Correct 3 ms 572 KB Output is correct
5 Correct 2 ms 576 KB Output is correct
6 Correct 130 ms 13548 KB Output is correct
7 Correct 75 ms 13496 KB Output is correct
8 Correct 94 ms 13468 KB Output is correct
9 Correct 92 ms 13376 KB Output is correct
10 Correct 103 ms 13400 KB Output is correct
11 Correct 102 ms 13504 KB Output is correct
12 Correct 117 ms 13556 KB Output is correct
13 Correct 126 ms 13700 KB Output is correct
14 Correct 126 ms 13492 KB Output is correct
15 Correct 124 ms 13504 KB Output is correct
16 Correct 1435 ms 96120 KB Output is correct
17 Correct 939 ms 95560 KB Output is correct
18 Correct 1165 ms 96068 KB Output is correct
19 Correct 986 ms 95296 KB Output is correct
20 Correct 1383 ms 95056 KB Output is correct
21 Correct 1454 ms 96880 KB Output is correct
22 Correct 1458 ms 96904 KB Output is correct
23 Correct 1436 ms 97128 KB Output is correct
24 Correct 1493 ms 96728 KB Output is correct
25 Correct 1459 ms 96360 KB Output is correct