제출 #1209107

#제출 시각아이디문제언어결과실행 시간메모리
1209107vaneaElection (BOI18_election)C++20
100 / 100
592 ms20380 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; string s; const int mxN = 2e6+10; array<int, 4> st[mxN]; array<int, 4> comb(array<int, 4> a, array<int, 4> b) { array<int, 4> ans; ans[0] = a[0] + b[0]; ans[1] = max(a[1], a[0] + b[1]); ans[2] = max(b[2], b[0] + a[2]); ans[3] = max({a[0]+b[3], a[3]+b[0], a[1]+b[2]}); return ans; } void build(int node, int l, int r) { if(l == r) { if(s[l] == 'T') st[node] = {1, 1, 1, 1}; else st[node] = {-1, 0, 0, 0}; return ; } int mid = (l+r)/2; build(node*2, l, mid); build(node*2+1, mid+1, r); st[node] = comb(st[node*2], st[node*2+1]); } array<int, 4> qry(int node, int l, int r, int l1, int r1) { if(l1 <= l && r <= r1) return st[node]; if(l > r1 || l1 > r) return {0, 0, 0, 0}; int mid = (l+r)/2; return comb(qry(node*2, l, mid, l1, r1), qry(node*2+1, mid+1, r, l1, r1)); } int main() { ios_base::sync_with_stdio(0); cin.tie(0); int n; cin >> n; cin >> s; int q; cin >> q; build(1, 0, n-1); while(q--) { int l, r; cin >> l >> r; --l; --r; array<int, 4> now = qry(1, 0, n-1, l, r); cout << now[3] << '\n'; } return 0; }
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