oj.uz

Submission #348794

# Submission time Handle Problem Language Result Execution time Memory
348794 2021-01-15T18:06:17 Z Enkognit Election (BOI18_election) C++14
100 / 100
 659 ms 41108 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#pragma GCC optimize("-O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#define ll long long
#define mp make_pair
#define pb push_back
#define ld long double
#define fi first
#define se second
#define pld pair<ld,ld>
#define pll pair<ll,ll>
#define pii pair<int,int>
#define y1 Enkognit
#define all(v) v.begin(),v.end()

using namespace std;
using namespace __gnu_pbds;

const ll MOD=1000000007;

ll n, m, k, T;
string s;

ll binpow(ll h,ll r)
{
    ll l=1;
    while (r)
    {
        if (r&1) l=(l*h)%MOD;
        h=(h*h)%MOD;
        r/=2;
    }
    return l;
}

struct node
{
    int sum;
    int ans;
    int l, r;
    node():l(0),r(0),sum(0),ans(0){};
    node(int h):l(h),r(h),sum(h),ans(h){};
};

node d[2000001];

node operator + (node x,node y)
{
    if (x.sum==-1e9) return y;
    if (y.sum==-1e9) return x;
    node n;
    n.sum=x.sum+y.sum;
    n.l=max(x.l, x.sum+y.l);
    n.r=max(y.r, y.sum+x.r);
    n.ans=max(max(x.ans + y.sum, y.ans + x.sum), x.l + y.r);
    return n;
}

void build(int h,int l,int r)
{
    if (l==r)
    {
        if (s[l]=='T')
        {
            d[h].l++;
            d[h].r++;
            d[h].sum++;
            d[h].ans++;
        }else
        {
            d[h].sum--;
        }
        return;
    }
    int w=(l+r)/2;
    build(h*2,l,w);
    build(h*2+1,w+1,r);
    d[h]=d[h*2]+d[h*2+1];
}

node get(int h,int l,int r,int x,int y)
{
    if (x>y) return node(-1e9);
    if (l==x && y==r) return d[h];
    int w=(l+r)/2;
    return get(h*2,l,w,x,min(y,w))+get(h*2+1,w+1,r,max(x,w+1),y);
}

void solve()
{
    cin >> n;
    cin >> s;
    s=' '+s;
    build(1,1,n);
    ll q;
    cin >> q;
    while (q--)
    {
        ll l, r;
        cin >> l >> r;
        cout << get(1,1,n,l,r).ans << "\n";
    }
}

int main()
{
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);
    ll t=1;
    //cin >> t;
    while (t--)
    {
        solve();
    }
    return 0;
}
/*
11
CCCTTTTTTCC
3
1 11
4 9
1 6
*/

Compilation message

election.cpp: In constructor 'node::node()':
election.cpp:42:12: warning: 'node::r' will be initialized after [-Wreorder]
   42 |     int l, r;
      |            ^
election.cpp:40:9: warning:   'int node::sum' [-Wreorder]
   40 |     int sum;
      |         ^~~
election.cpp:43:5: warning:   when initialized here [-Wreorder]
   43 |     node():l(0),r(0),sum(0),ans(0){};
      |     ^~~~
election.cpp: In constructor 'node::node(int)':
election.cpp:42:12: warning: 'node::r' will be initialized after [-Wreorder]
   42 |     int l, r;
      |            ^
election.cpp:40:9: warning:   'int node::sum' [-Wreorder]
   40 |     int sum;
      |         ^~~
election.cpp:44:5: warning:   when initialized here [-Wreorder]
   44 |     node(int h):l(h),r(h),sum(h),ans(h){};
      |     ^~~~

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 31724 KB Output is correct
2 Correct 20 ms 31724 KB Output is correct
3 Correct 20 ms 31616 KB Output is correct
4 Correct 20 ms 31724 KB Output is correct
5 Correct 20 ms 31724 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 31724 KB Output is correct
2 Correct 20 ms 31724 KB Output is correct
3 Correct 20 ms 31616 KB Output is correct
4 Correct 20 ms 31724 KB Output is correct
5 Correct 20 ms 31724 KB Output is correct
6 Correct 82 ms 33000 KB Output is correct
7 Correct 75 ms 33000 KB Output is correct
8 Correct 82 ms 33000 KB Output is correct
9 Correct 71 ms 33000 KB Output is correct
10 Correct 79 ms 32872 KB Output is correct
11 Correct 81 ms 33128 KB Output is correct
12 Correct 80 ms 33156 KB Output is correct
13 Correct 80 ms 33128 KB Output is correct
14 Correct 79 ms 33128 KB Output is correct
15 Correct 80 ms 33068 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 31724 KB Output is correct
2 Correct 20 ms 31724 KB Output is correct
3 Correct 20 ms 31616 KB Output is correct
4 Correct 20 ms 31724 KB Output is correct
5 Correct 20 ms 31724 KB Output is correct
6 Correct 82 ms 33000 KB Output is correct
7 Correct 75 ms 33000 KB Output is correct
8 Correct 82 ms 33000 KB Output is correct
9 Correct 71 ms 33000 KB Output is correct
10 Correct 79 ms 32872 KB Output is correct
11 Correct 81 ms 33128 KB Output is correct
12 Correct 80 ms 33156 KB Output is correct
13 Correct 80 ms 33128 KB Output is correct
14 Correct 79 ms 33128 KB Output is correct
15 Correct 80 ms 33068 KB Output is correct
16 Correct 651 ms 39956 KB Output is correct
17 Correct 551 ms 40212 KB Output is correct
18 Correct 602 ms 40376 KB Output is correct
19 Correct 488 ms 39828 KB Output is correct
20 Correct 657 ms 39344 KB Output is correct
21 Correct 658 ms 40980 KB Output is correct
22 Correct 659 ms 40852 KB Output is correct
23 Correct 653 ms 41108 KB Output is correct
24 Correct 644 ms 40724 KB Output is correct
25 Correct 659 ms 40524 KB Output is correct