oj.uz

Submission #589801

# Submission time Handle Problem Language Result Execution time Memory
589801 2022-07-05T09:42:38 Z Do_you_copy Election (BOI18_election) C++14
100 / 100
 548 ms 27908 KB 
#include <bits/stdc++.h>
#define taskname "test"
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
using ull = unsigned ll;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

//const ll Mod = 1000000009;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 5e5 + 1;

int n;
string s;

struct TNode{
    int pre, suf, sum, val;
    TNode operator + (TNode other){
        TNode tem;
        tem.val = max(max(val + other.sum, sum + other.val), pre + other.suf);
        tem.pre = max(pre, other.pre + sum);
        tem.suf = max(other.suf, suf + other.sum);
        tem.sum = sum + other.sum;
        return tem;
    }
};

TNode st[maxN * 4];
void build(int id = 1, int l = 1, int r = n){
    if (l == r){
        if (s[l - 1] == 'T') st[id] = {1, 1, 1, 1};
        else st[id] = {0, 0, -1, 0};

        return;
    }
    int m = (l + r) / 2;
    build(id * 2, l, m);
    build(id * 2 + 1, m + 1, r);
    st[id] = st[id * 2] + st[id * 2 + 1];
}

TNode get(int i, int j, int id = 1, int l = 1, int r = n){
    if (r < i || l > j) return {0, 0, 0, 0};
    if (i <= l && r <= j){
        return st[id];
    }
    int m = (l + r) / 2;
    return get(i, j, id * 2, l, m) + get(i, j, id * 2 + 1, m + 1, r);
}

void Init(){
    cin >> n >> s;
    int q; cin >> q;
    build();
    while (q--){
        int l, r;
        cin >> l >> r;
        cout << get(l, r).val << "\n";
    }
}


int main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        //freopen(taskname".out", "w", stdout);
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
}

Compilation message

election.cpp: In function 'int main()':
election.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 3 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 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 3 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 47 ms 4808 KB Output is correct
7 Correct 43 ms 4788 KB Output is correct
8 Correct 54 ms 4756 KB Output is correct
9 Correct 52 ms 4744 KB Output is correct
10 Correct 45 ms 4640 KB Output is correct
11 Correct 48 ms 4928 KB Output is correct
12 Correct 52 ms 5016 KB Output is correct
13 Correct 48 ms 4972 KB Output is correct
14 Correct 49 ms 4924 KB Output is correct
15 Correct 46 ms 4860 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 3 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 47 ms 4808 KB Output is correct
7 Correct 43 ms 4788 KB Output is correct
8 Correct 54 ms 4756 KB Output is correct
9 Correct 52 ms 4744 KB Output is correct
10 Correct 45 ms 4640 KB Output is correct
11 Correct 48 ms 4928 KB Output is correct
12 Correct 52 ms 5016 KB Output is correct
13 Correct 48 ms 4972 KB Output is correct
14 Correct 49 ms 4924 KB Output is correct
15 Correct 46 ms 4860 KB Output is correct
16 Correct 548 ms 26248 KB Output is correct
17 Correct 386 ms 26544 KB Output is correct
18 Correct 492 ms 26840 KB Output is correct
19 Correct 341 ms 26336 KB Output is correct
20 Correct 466 ms 26036 KB Output is correct
21 Correct 467 ms 27816 KB Output is correct
22 Correct 446 ms 27836 KB Output is correct
23 Correct 445 ms 27908 KB Output is correct
24 Correct 463 ms 27644 KB Output is correct
25 Correct 463 ms 27192 KB Output is correct