Submission #825527

#	Time	Username	Problem	Language	Result	Execution time	Memory
825527		boyliguanhan	Election (BOI18_election)	C++17	100 / 100	681 ms	179968 KiB

election

#include<bits/stdc++.h>
using namespace std;
struct Data {
    int l=0,r=0,s=0,a=0;
    Data():l(0){}
    Data(bool b) : l(b), r(b), s(b?1:-1), a(b){}
    Data(Data a, Data b) : l(max(a.l, a.s+b.l)), r(max(b.r,b.s+a.r)), s(a.s+b.s), a(max(max(a.a+b.s, b.a+a.s), a.l+b.r)){}
};
vector<vector<Data>> tb(500100, vector<Data>(20));
int main() {
    cin.sync_with_stdio(false);
    cin.tie(nullptr);
    int n, q;
    string str;
    cin >> n >> str >> q;
    for(int i = 1; i <= n; i++) {
        tb[i][0] = Data(str[i-1]=='T');
    }
    for(int j = 1; j < 20; j++)
        for(int i = 1; i < n-(1<<j)+2; i++)
            tb[i][j] = Data(tb[i][j-1], tb[i+(1<<j-1)][j-1]);
    while(q--){
        Data d;
        int a, b;
        cin >> a >> b;
        for(int i = 20;i--;)
            if(a+(1<<i)-2<b)
                d = Data(d,tb[a][i]), a+=(1<<i);
        cout << d.a << '\n';
    }
}

Compilation message (stderr)

election.cpp: In function 'int main()':
election.cpp:21:51: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   21 |             tb[i][j] = Data(tb[i][j-1], tb[i+(1<<j-1)][j-1]);
      |                                                  ~^~

• Subtask 1: 28 / 28
• Subtask 2: 54 / 54
• Subtask 3: 18 / 18