oj.uz

Submission #888948

# Submission time Handle Problem Language Result Execution time Memory
888948 2023-12-18T12:55:53 Z chanhchuong123 Election (BOI18_election) C++14
100 / 100
 337 ms 20216 KB 
#include<bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int l, int r) {
	return uniform_int_distribution<int>(l, r)(rng);
}

const int MAX = 500050;
int nPer;
int nQue;
string S;

struct node {
    int ans, sum, pre, suf;

    node(int value = 0) {
        sum = value;
        ans = max(0, value);
        pre = max(0, value);
        suf = max(0, value);
    }
} st[(1 << 20) + 5];

node combine(const node &lf, const node &rg) {
    node res;

    res.sum = lf.sum + rg.sum;
    res.pre = max(lf.pre, lf.sum + rg.pre);
    res.suf = max(rg.suf, lf.suf + rg.sum);
    res.ans = max({lf.ans + rg.sum, lf.sum + rg.ans, lf.pre + rg.suf});

    return res;
}

void build(int id, int l, int r) {
    if (l == r) {
        st[id] = node(S[l] == 'C' ? -1 : +1);
        return;
    }
    int mid = l + r >> 1;
    build(id << 1, l, mid);
    build(id << 1 | 1, mid + 1, r);
    st[id] = combine(st[id << 1], st[id << 1 | 1]);
}

node get(int id, int l, int r, int u, int v) {
    if (l >= u && r <= v) return st[id];

    int mid = l + r >> 1;
    if (u <= mid && mid + 1 <= v)
        return combine(get(id << 1, l, mid, u, v), get(id << 1 | 1, mid + 1, r, u, v));

    if (u <= mid)
        return get(id << 1, l, mid, u, v);

    return get(id << 1 | 1, mid + 1, r, u, v);
}

void process(void) {
    cin >> nPer >> S >> nQue; S = ' ' + S;
    build(1, 1, nPer);
    while (nQue--) {
        int l, r; cin >> l >> r;
        cout << get(1, 1, nPer, l, r).ans << '\n';
    }
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
//	freopen(".INP", "r",  stdin);
//	freopen(".OUT", "w", stdout);

    process();

	return 0;
}

Compilation message

election.cpp: In function 'void build(int, int, int)':
election.cpp:47:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |     int mid = l + r >> 1;
      |               ~~^~~
election.cpp: In function 'node get(int, int, int, int, int)':
election.cpp:56:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   56 |     int mid = l + r >> 1;
      |               ~~^~~

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 16728 KB Output is correct
2 Correct 5 ms 16732 KB Output is correct
3 Correct 5 ms 16732 KB Output is correct
4 Correct 5 ms 16732 KB Output is correct
5 Correct 5 ms 16888 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 16728 KB Output is correct
2 Correct 5 ms 16732 KB Output is correct
3 Correct 5 ms 16732 KB Output is correct
4 Correct 5 ms 16732 KB Output is correct
5 Correct 5 ms 16888 KB Output is correct
6 Correct 37 ms 17060 KB Output is correct
7 Correct 40 ms 17240 KB Output is correct
8 Correct 41 ms 17228 KB Output is correct
9 Correct 31 ms 17228 KB Output is correct
10 Correct 39 ms 16984 KB Output is correct
11 Correct 37 ms 17340 KB Output is correct
12 Correct 37 ms 17228 KB Output is correct
13 Correct 39 ms 17240 KB Output is correct
14 Correct 39 ms 17200 KB Output is correct
15 Correct 37 ms 17240 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 16728 KB Output is correct
2 Correct 5 ms 16732 KB Output is correct
3 Correct 5 ms 16732 KB Output is correct
4 Correct 5 ms 16732 KB Output is correct
5 Correct 5 ms 16888 KB Output is correct
6 Correct 37 ms 17060 KB Output is correct
7 Correct 40 ms 17240 KB Output is correct
8 Correct 41 ms 17228 KB Output is correct
9 Correct 31 ms 17228 KB Output is correct
10 Correct 39 ms 16984 KB Output is correct
11 Correct 37 ms 17340 KB Output is correct
12 Correct 37 ms 17228 KB Output is correct
13 Correct 39 ms 17240 KB Output is correct
14 Correct 39 ms 17200 KB Output is correct
15 Correct 37 ms 17240 KB Output is correct
16 Correct 326 ms 19368 KB Output is correct
17 Correct 289 ms 19268 KB Output is correct
18 Correct 300 ms 19340 KB Output is correct
19 Correct 239 ms 18936 KB Output is correct
20 Correct 300 ms 18432 KB Output is correct
21 Correct 323 ms 20132 KB Output is correct
22 Correct 301 ms 20104 KB Output is correct
23 Correct 337 ms 20192 KB Output is correct
24 Correct 303 ms 20216 KB Output is correct
25 Correct 328 ms 19448 KB Output is correct