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Submission #567734

# Submission time Handle Problem Language Result Execution time Memory
567734 2022-05-24T06:07:45 Z Tam_theguide Election (BOI18_election) C++14
100 / 100
 644 ms 27488 KB 
#include <bits/stdc++.h>
using namespace std;
int n, q;
struct node{
    int p;
    int s;
    int t;
    int a;
};
node seg[2310000];
node combine(node x, node y){
    node re;
    re.p = max(x.p, x.t + y.p);
    re.s = max(y.s, y.t + x.s);
    re.t = x.t + y.t;
    re.a = max(x.p + y.s, max(x.a + y.t, y.a + x.t));
    return re;
}
void update(int root, int tl, int tr, int pos, int val){
    if (tl == tr){
        seg[root].p = max(seg[root].p, val);
        seg[root].s = max(seg[root].s, val);
        //seg[root].p = val; seg[root].s = val;
        seg[root].t += val;
        seg[root].a = ((val == -1) ? 0 : 1);
        return;
    }
    int tm = (tl + tr) / 2;
    if (pos <= tm) update(2 * root, tl, tm, pos, val);
    else update(2 * root + 1, tm + 1, tr, pos, val);
    seg[root] = combine(seg[2 * root], seg[2 * root + 1]);
}
node query(int root, int tl, int tr, int l, int r){
    if (tl > r || tr < l) return {0, 0, 0, 0};
    if (tl >= l && tr <= r) return seg[root];
    int tm = (tl + tr) / 2;
    return combine(query(2 * root, tl, tm, l, r), query(2 * root + 1, tm + 1, tr, l, r));
}
int main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;

    for (int i = 1;i <= n;i ++){
        char x; cin >> x;
        update(1, 1, n, i, ((x == 'C') ? -1 : 1));
    }

    cin >> q;
    while (q--){
        int l, r; cin >> l >> r;
        cout << query(1, 1, n, l, r).a << '\n';
    }
}
/*
3
TCT
3
1 1
2 2
1 2
*/

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Correct 2 ms 344 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Correct 2 ms 344 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 69 ms 5588 KB Output is correct
7 Correct 63 ms 5472 KB Output is correct
8 Correct 57 ms 5524 KB Output is correct
9 Correct 59 ms 5452 KB Output is correct
10 Correct 69 ms 5508 KB Output is correct
11 Correct 81 ms 5612 KB Output is correct
12 Correct 68 ms 5620 KB Output is correct
13 Correct 81 ms 5620 KB Output is correct
14 Correct 64 ms 5632 KB Output is correct
15 Correct 74 ms 5624 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Correct 2 ms 344 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 69 ms 5588 KB Output is correct
7 Correct 63 ms 5472 KB Output is correct
8 Correct 57 ms 5524 KB Output is correct
9 Correct 59 ms 5452 KB Output is correct
10 Correct 69 ms 5508 KB Output is correct
11 Correct 81 ms 5612 KB Output is correct
12 Correct 68 ms 5620 KB Output is correct
13 Correct 81 ms 5620 KB Output is correct
14 Correct 64 ms 5632 KB Output is correct
15 Correct 74 ms 5624 KB Output is correct
16 Correct 602 ms 26452 KB Output is correct
17 Correct 502 ms 26080 KB Output is correct
18 Correct 573 ms 26316 KB Output is correct
19 Correct 460 ms 25608 KB Output is correct
20 Correct 622 ms 25356 KB Output is correct
21 Correct 561 ms 27212 KB Output is correct
22 Correct 622 ms 27068 KB Output is correct
23 Correct 644 ms 27488 KB Output is correct
24 Correct 599 ms 27080 KB Output is correct
25 Correct 603 ms 26504 KB Output is correct