Submission #467837

#TimeUsernameProblemLanguageResultExecution timeMemory
467837nickmet2004Election (BOI18_election)C++11
100 / 100
1444 ms22204 KiB
#include<bits/stdc++.h> using namespace std; const int N = 5e5 + 5; int n , a[N]; string s; struct Node{ int L , R , cnt , ans; Node operator+(Node y){ Node ret; ret.cnt = cnt + y.cnt; ret.L = max(L ,cnt + y.L); ret.R = max(y.R , y.cnt + R); ret.ans = max({ans + y.cnt , y.ans + cnt , L + y.R}); return ret; } }T[4*N]; void B(int l = 0 , int r = n - 1 , int pos = 0){ if(l == r){ if(a[l] == 1) T[pos] = {1 , 1, 1, 1}; else T[pos] = {0 , 0 , -1 , 0}; return; } int mid = (l + r) >> 1; B(l , mid , pos * 2 + 1); B(mid + 1 ,r , pos * 2 + 2); T[pos] = T[pos *2 + 1] + T[pos *2 + 2]; } Node get(int L , int R , int l =0 , int r = n - 1 , int pos = 0){ if(r <L || R < l) return {0 , 0 , 0 , 0}; if(L <= l && r <= R) return T[pos]; int mid = (l + r) >> 1; return get(L , R , l , mid , pos * 2 + 1) + get(L , R , mid + 1 , r , pos * 2 + 2); } int main (){ ios_base::sync_with_stdio(0); cin.tie(0); cin >> n >> s; memset(a , -1 , sizeof(a)); for(int i = 0;i < n; ++i){ if(s[i] == 'T')a[i] = 1; } B(); int q; cin >> q; while(q--){ int a , b; cin >> a >> b; --a; --b; cout << get(a , b).ans << endl; } }
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