oj.uz

Submission #261404

# Submission time Handle Problem Language Result Execution time Memory
261404 2020-08-11T17:18:30 Z Falcon Election (BOI18_election) C++14
100 / 100
 618 ms 45168 KB 
#pragma GCC optimize("O2")

#include <bits/stdc++.h>
#ifdef DEBUG
    #include "debug.hpp"
#endif

using namespace std;

#define all(c) (c).begin(), (c).end()
#define traverse(c, it) for(auto it = (c).begin(); it != (c).end(); it++)
#define rep(i, N) for(int i = 0; i < (N); i++)
#define rep1(i, N) for(int i = 1; i <= (N); i++)
#define rep2(i, s, e) for(int i = (s); i <= (e); i++)
#define rep3(i, s, e, d) for(int i = (s); (d) >= 0 ? i <= (e) : i >= (e); i += (d))
#define pb push_back


#ifdef DEBUG
    #define debug(x...) {dbg::depth++; string dbg_vals = dbg::to_string(x); dbg::depth--; dbg::fprint(__func__, __LINE__, #x, dbg_vals);}
    #define light_debug(x) {dbg::light = 1; dbg::dout << __func__ << ":" << __LINE__ << "  " << #x << " = " << x << endl; dbg::light = 0;}
#else
    #define debug(x...)
    #define light_debug(x) 
#endif

template<typename T>
T& ckmin(T& a, T b){ return a = a > b ? b : a; }

template<typename T>
T& ckmax(T& a, T b){ return a = a < b ? b : a; }

using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

namespace ioUtils {

    char vector_delimiter = ' ';

    template<typename T>
    istream& operator >>(istream&, vector<T>&);

    template<typename... Ts>
    istream& operator >>(istream& is, pair<Ts...>& p){
        is >> p.first >> p.second;
        return is;
    }

    template<typename T> 
    istream& operator >>(istream& is, vector<T>& v){
        for(auto& e : v) is >> e;
	       return is;
    }

    template<typename T>
    ostream& operator <<(ostream&, vector<T>&);

    template<typename... Ts>
    ostream& operator <<(ostream& os, pair<Ts...>& p){
        os << p.first << " " << p.second;
        return os;
    }

    template<typename T>
    ostream& operator <<(ostream& os, vector<T>& v){
        for(auto&& e : v) os << e << vector_delimiter;
        return os;   
    }   
}

using namespace ioUtils;


template<int n>
class segtree{
	struct node{
		int sum, max_suff;

		node(int v = 0){
			max_suff = max(0, sum = v);
		}

		node operator +(node x){
			ckmax(x.max_suff, max_suff + x.sum), x.sum += sum;
			return x;
		}
	};

	array<node, n << 1> seg;

public:
	void update(int i, int v){
		for(seg[i += n] = v, i >>= 1; i; i >>= 1)
			seg[i] = seg[i << 1] + seg[i << 1 | 1];
	}

	int query(int s, int e){
		node l, r;
		for(s += n, e += n; s < e; s >>= 1, e >>= 1){
			if(s & 1) l = l + seg[s++];
			if(e & 1) r = seg[--e] + r;
		}
		return (l + r).max_suff;
	}
};


struct query{
	int l, r, i;
};

const int MAX_N = 500000;

int N, Q;
vector<query> queries[MAX_N];
segtree<MAX_N> seg;
string s;

signed main(){

    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    #ifdef DEBUG
        freopen("debug", "w", stderr);
    #endif
    
    cin >> N >> s >> Q;
    rep(i, Q){
    	int l, r;
    	cin >> l >> r;
    	--l;
    	queries[l].pb({l, r, i});
    }

    vi Ts, ans(Q);
    rep3(i, N - 1, 0, -1){
    	if(s[i] == 'C'){
    		seg.update(i, -1);
    		if(!Ts.empty()) 
    			seg.update(Ts.back(), 1), Ts.pop_back();
    	} else 
    		Ts.pb(i);
    	for(auto&& q : queries[i])
    		ans[q.i] = Ts.size() - (upper_bound(all(Ts), q.r, greater<int>()) - Ts.begin()) + seg.query(i, q.r);
    }

    vector_delimiter = '\n';
    cout << ans;

    #ifdef DEBUG
        dbg::dout << "\nExecution time: " << clock() << "ms\n";
    #endif

    return 0;
}

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 20096 KB Output is correct
2 Correct 16 ms 19968 KB Output is correct
3 Correct 16 ms 19968 KB Output is correct
4 Correct 16 ms 19968 KB Output is correct
5 Correct 17 ms 20096 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 20096 KB Output is correct
2 Correct 16 ms 19968 KB Output is correct
3 Correct 16 ms 19968 KB Output is correct
4 Correct 16 ms 19968 KB Output is correct
5 Correct 17 ms 20096 KB Output is correct
6 Correct 68 ms 23032 KB Output is correct
7 Correct 56 ms 22904 KB Output is correct
8 Correct 57 ms 22796 KB Output is correct
9 Correct 64 ms 23032 KB Output is correct
10 Correct 64 ms 23032 KB Output is correct
11 Correct 69 ms 23288 KB Output is correct
12 Correct 67 ms 23160 KB Output is correct
13 Correct 69 ms 23416 KB Output is correct
14 Correct 64 ms 23160 KB Output is correct
15 Correct 63 ms 23120 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 20096 KB Output is correct
2 Correct 16 ms 19968 KB Output is correct
3 Correct 16 ms 19968 KB Output is correct
4 Correct 16 ms 19968 KB Output is correct
5 Correct 17 ms 20096 KB Output is correct
6 Correct 68 ms 23032 KB Output is correct
7 Correct 56 ms 22904 KB Output is correct
8 Correct 57 ms 22796 KB Output is correct
9 Correct 64 ms 23032 KB Output is correct
10 Correct 64 ms 23032 KB Output is correct
11 Correct 69 ms 23288 KB Output is correct
12 Correct 67 ms 23160 KB Output is correct
13 Correct 69 ms 23416 KB Output is correct
14 Correct 64 ms 23160 KB Output is correct
15 Correct 63 ms 23120 KB Output is correct
16 Correct 549 ms 43408 KB Output is correct
17 Correct 374 ms 41612 KB Output is correct
18 Correct 443 ms 41432 KB Output is correct
19 Correct 484 ms 42508 KB Output is correct
20 Correct 558 ms 42508 KB Output is correct
21 Correct 618 ms 44808 KB Output is correct
22 Correct 539 ms 44312 KB Output is correct
23 Correct 567 ms 45168 KB Output is correct
24 Correct 545 ms 44556 KB Output is correct
25 Correct 520 ms 43532 KB Output is correct