Submission #59945

#	Time	Username	Problem	Language	Result	Execution time	Memory
59945		egorlifar	Election (BOI18_election)	C++17	100 / 100	976 ms	39276 KiB

election

/*
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 */
#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
    
     
using namespace std;
template<typename T1, typename T2>inline void chkmin(T1 &x, T2 y) { if (x > y) x = y; }
template<typename T1, typename T2>inline void chkmax(T1 &x, T2 y) { if (x < y) x = y; } 
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const pair<T, U> &_p) { _out << _p.first << ' ' << _p.second; return _out; }
template<typename T, typename U> inline istream &operator>> (istream &_in, pair<T, U> &_p) { _in >> _p.first >> _p.second; return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const vector<T> &_v) { if (_v.empty()) { return _out; } _out << _v.front(); for (auto _it = ++_v.begin(); _it != _v.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline istream &operator>> (istream &_in, vector<T> &_v) { for (auto &_i : _v) { _in >> _i; } return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const unordered_map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
#define sz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define left left228
#define right right228
#define next next228
#define rank rank228
#define prev prev228
#define y1 y1228                                                         
#define read(FILENAME) freopen((FILENAME + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((FILENAME + ".out").c_str(), "w", stdout)
#define files(FILENAME) read(FILENAME), write(FILENAME)
#define pb push_back
const string FILENAME = "input";
const int MAXN = 500228;



struct node
{
	int sum;
	int suff;
};


int n;
string s;
int val[MAXN];
int q;
vector<pair<int, int> > z[MAXN];
int ss = 1;
int ans[MAXN];
node d[MAXN * 4];


void calc(int v) {
	d[v].sum = d[v * 2].sum + d[v * 2 + 1].sum;
	d[v].suff = min(d[v * 2 + 1].suff, d[v * 2 + 1].sum + d[v * 2].suff);
}

void change(int i, int x) {
	d[i].sum = x;
	d[i].suff = min(x, 0);
	while (i >> 1 > 0) {
		i >>= 1;
		calc(i);
	}
}


node get(int v, int vl, int vr, int l, int r) {
	if (vl > r || vr < l) {
		node kek;
		kek.sum = 1e9;
		kek.suff = 1e9;
		return kek;
	}
	if (l <= vl && vr <= r) {
		return d[v];
	}
	node a = get(v * 2, vl, (vl + vr) / 2, l, r);
	node b = get(v * 2 + 1, (vl + vr) / 2 + 1, vr, l, r);
	if (b.sum > 1e6) {
		return a;
	}
	node c;
	c.suff = min(b.suff, a.suff + b.sum);
	c.sum = a.sum + b.sum;
	return c;
}


int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	//read(FILENAME);
	cin >> n >> s;
	for (int i = 0; i < n; i++) {
		if (s[i] == 'T') {
			val[i] = -1;
		} else {
			val[i] = 1;
		}
	}
	cin >> q;
	for (int it = 0; it < q; it++) {
		int l, r;
		cin >> l >> r;
		l--, r--;
		z[l].pb({r, it});
	}
	while (ss < n) {
		ss <<= 1;
	}
	for (int i = 0; i < n; i++) {
		change(ss + i, 1);
	}
	//l[i] > lbal;
	//r[i] > rbal;
	vector<int> st;
	for (int i = n - 1; i >= 0; i--) {
		if (val[i] == -1) {
			st.pb(i);
			change(ss + i, 0);
		} else {
			if (!st.empty()) {
				change(ss + st.back(), -1);
				st.pop_back();
			}
		}
		for (auto q: z[i]) {
			ans[q.second] = upper_bound(rall(st), q.first) - st.rbegin() - get(1, 1, ss, 1, q.first + 1).suff;
		}
	}
	for (int i = 0; i < q; i++) {
		cout << ans[i] << '\n';
	}
	return 0; 		
}

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