oj.uz

Submission #703691

# Submission time Handle Problem Language Result Execution time Memory
703691 2023-02-28T06:34:10 Z Chal1shkan Election (BOI18_election) C++14
100 / 100
 554 ms 44376 KB 
# include <bits/stdc++.h>
 
# define pb push_back
# define ff first
# define ss second
# define nl "\n"
# define sz(x) ((int)(x).size())
# define deb(x) cerr << #x  << " = " << x << endl; 
# define pll pair <ll, ll>

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
 
const ll maxn = 5e5 + 25;
const ll inf = 1e18 + 0;
const ll mod = 1e9 + 7;
const ll dx[] = {-1, 1, 0, 0};
const ll dy[] = {0, 0, -1, 1};
 
using namespace std;

ll n, q;
string s;
struct node
{
	ll pref, suff, sum, ans;
} t[maxn * 4];

node combine (node l, node r)
{
	node res;
	res.pref = max(l.pref, l.sum + r.pref);
	res.suff = max(r.suff, r.sum + l.suff);
	res.sum = l.sum + r.sum;
	res.ans = max ({l.ans + r.sum, r.ans + l.sum, l.pref + r.suff});
	return res;
}

void build (ll v = 1, ll tl = 1, ll tr = n)
{
	if (tl == tr)
	{
		ll val = max((ll)(s[tl - 1] == 'T' ? 1 : -1), 0LL);
		t[v] = {val, val, (s[tl - 1] == 'T' ? 1 : -1), val};
		return;
	}
	else
	{
		ll tm = (tl + tr) >> 1;
		build (v * 2, tl, tm);;
		build (v * 2 + 1, tm + 1, tr);
		t[v] = combine(t[v * 2], t[v * 2 + 1]);
	}
}

node get (ll l, ll r, ll v = 1, ll tl = 1, ll tr = n)
{
	if (tr < l || r < tl) return {0, 0, 0, 0};
	if (l <= tl && tr <= r) return t[v];
	ll tm = (tl + tr) >> 1;
	return combine(get(l, r, v * 2, tl, tm), get(l, r, v * 2  +1, tm + 1, tr));
}

void ma1n (/* SABR */)
{
	cin >> n >> s >> q;
	build();
	while (q--)
	{
		ll l, r;
		cin >> l >> r;
		cout << get(l, r).ans << nl;
	}
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
//  freopen("file.in", "r", stdin);
//  freopen("file.out", "w", stdout);
    int ttt = 1;	
//  cin >> ttt;
    for (int test = 1; test <= ttt; ++test)
    {
//      cout << "Case " << test << ":" << ' ';
        ma1n();
    }
    return 0;
}

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 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 1 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 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 57 ms 8920 KB Output is correct
7 Correct 51 ms 8924 KB Output is correct
8 Correct 58 ms 8852 KB Output is correct
9 Correct 48 ms 8888 KB Output is correct
10 Correct 55 ms 8788 KB Output is correct
11 Correct 55 ms 8968 KB Output is correct
12 Correct 59 ms 9056 KB Output is correct
13 Correct 55 ms 9028 KB Output is correct
14 Correct 56 ms 9048 KB Output is correct
15 Correct 55 ms 8944 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 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 57 ms 8920 KB Output is correct
7 Correct 51 ms 8924 KB Output is correct
8 Correct 58 ms 8852 KB Output is correct
9 Correct 48 ms 8888 KB Output is correct
10 Correct 55 ms 8788 KB Output is correct
11 Correct 55 ms 8968 KB Output is correct
12 Correct 59 ms 9056 KB Output is correct
13 Correct 55 ms 9028 KB Output is correct
14 Correct 56 ms 9048 KB Output is correct
15 Correct 55 ms 8944 KB Output is correct
16 Correct 527 ms 42648 KB Output is correct
17 Correct 436 ms 42880 KB Output is correct
18 Correct 485 ms 43484 KB Output is correct
19 Correct 493 ms 42700 KB Output is correct
20 Correct 539 ms 42464 KB Output is correct
21 Correct 549 ms 44256 KB Output is correct
22 Correct 546 ms 44060 KB Output is correct
23 Correct 527 ms 44376 KB Output is correct
24 Correct 554 ms 44068 KB Output is correct
25 Correct 533 ms 43492 KB Output is correct