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답안 #564474

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
564474 2022-05-19T09:31:43 Z keta_tsimakuridze Election (BOI18_election) C++14
100 / 100
 901 ms 49808 KB 
#include<bits/stdc++.h>
using namespace std;
//#define int long long
#define pii pair<int,int>
#define f first
#define s second
#define endl "\n"
const int N = 5e5 + 5, mod = 1e9 + 7; //!
int t[N], t2[N], p[N], tree[4 * N], lazy[4 * N], ans[N];
vector<pair<int,int> > x[N];
void push(int u ,int l,int r) {
	tree[u] += lazy[u];
	if(l != r) lazy[2 * u] += lazy[u], lazy[2 * u + 1] += lazy[u];
	lazy[u] = 0;
	return;
}
void upd(int u, int st, int en, int l,int r,int v) {
	if(lazy[u]) push(u, l, r);
	if(l > en || r < st) return;
	if(st <= l && r <= en) {
		lazy[u] = v;
		push(u, l, r);
		return;
	}
	int mid = (l + r) / 2;
	upd(2 * u, st, en, l, mid, v); upd(2 * u + 1, st, en, mid + 1, r, v);
	tree[u] = max(tree[2 * u], tree[2 * u + 1]);
}
int get(int u, int st,int en, int l,int r) {
	if(lazy[u]) push(u, l, r);
	if(l > en || r < st) return -N;
	if(st <= l && r <= en) return tree[u];
	int mid = (l + r) / 2;
	return max(get(2 * u, st, en, l, mid), get(2 * u + 1, st, en, mid + 1, r));	
}
void upd(int id, int val) {
	for(id; id >= 1; id -= id & (-id)) t[id] += val;
}	int n;
int get(int id) {
	int ans = 0;
	for(id; id <= n; id += id & (-id)) ans += t[id];
	return ans;
}
void UPD(int id, int val) {
	for(id; id >= 1; id -= id & (-id)) t2[id] += val;
}
int GET(int id) {
	int ans = 0;
	for(id; id <= n; id += id & (-id)) ans += t2[id];
	return ans;
}
main() {
	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);

	cin >> n;
	for(int i = 1; i <= n; i++) {
		char c; cin >> c;
		p[i] = p[i - 1] + (c == 'T' ? 1 : -1);
		upd(1, 1, i, 1, n, p[i] - p[i - 1]);
		upd(i, p[i] - p[i - 1]);
	}
	int q; cin >> q;
	for(int i = 1; i <= q; i++) {
		int l, r;
		cin >> l >> r;
		x[l].push_back({i, r});
	}
	
	vector<int> v;
	int l = 0;
	for(int i = n; i >= 1; i--) {
		while(v.size() && p[v.back()] <= p[i]) {
			if(l == v.size()) {
				l--;
				upd(v.back(), 1);
				UPD(v.back(), -1);
				upd(1,1, v.back(), 1, n, 1);
			}
			v.pop_back();
		}
		v.push_back(i);
		while(l < v.size() && p[v[l]] - p[i - 1] > 0)  upd(1, 1, v[l], 1, n, -1), upd(v[l], -1), UPD(v[l], 1),  ++l;
		while(l > 0 && p[v[l - 1]] - p[i - 1] <= 0) upd(1, 1, v[l - 1], 1, n, 1), upd(v[l - 1], 1), UPD(v[l - 1], -1), --l;
		if(x[i].size()) {

		} else continue;
		for(int j = 0; j < x[i].size(); j++) {
			ans[x[i][j].f] = max(0, get(1, i, x[i][j].s, 1, n) -  get(x[i][j].s + 1)) + GET(i) - GET(x[i][j].s + 1);
		}
	}
	
	for(int i = 1; i <= q; i++) cout << ans[i] << endl;
}

Compilation message

election.cpp: In function 'void upd(int, int)':
election.cpp:37:6: warning: statement has no effect [-Wunused-value]
   37 |  for(id; id >= 1; id -= id & (-id)) t[id] += val;
      |      ^~
election.cpp: In function 'int get(int)':
election.cpp:41:6: warning: statement has no effect [-Wunused-value]
   41 |  for(id; id <= n; id += id & (-id)) ans += t[id];
      |      ^~
election.cpp: In function 'void UPD(int, int)':
election.cpp:45:6: warning: statement has no effect [-Wunused-value]
   45 |  for(id; id >= 1; id -= id & (-id)) t2[id] += val;
      |      ^~
election.cpp: In function 'int GET(int)':
election.cpp:49:6: warning: statement has no effect [-Wunused-value]
   49 |  for(id; id <= n; id += id & (-id)) ans += t2[id];
      |      ^~
election.cpp: At global scope:
election.cpp:52:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   52 | main() {
      | ^~~~
election.cpp: In function 'int main()':
election.cpp:73:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |    if(l == v.size()) {
      |       ~~^~~~~~~~~~~
election.cpp:82:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |   while(l < v.size() && p[v[l]] - p[i - 1] > 0)  upd(1, 1, v[l], 1, n, -1), upd(v[l], -1), UPD(v[l], 1),  ++l;
      |         ~~^~~~~~~~~~
election.cpp:87:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |   for(int j = 0; j < x[i].size(); j++) {
      |                  ~~^~~~~~~~~~~~~

Subtask #1
28.0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 12212 KB Output is correct
2 Correct 11 ms 12212 KB Output is correct
3 Correct 9 ms 12208 KB Output is correct
4 Correct 10 ms 12132 KB Output is correct
5 Correct 9 ms 12220 KB Output is correct

Subtask #2
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 12212 KB Output is correct
2 Correct 11 ms 12212 KB Output is correct
3 Correct 9 ms 12208 KB Output is correct
4 Correct 10 ms 12132 KB Output is correct
5 Correct 9 ms 12220 KB Output is correct
6 Correct 104 ms 16968 KB Output is correct
7 Correct 86 ms 16500 KB Output is correct
8 Correct 97 ms 16588 KB Output is correct
9 Correct 97 ms 16864 KB Output is correct
10 Correct 102 ms 16804 KB Output is correct
11 Correct 88 ms 17180 KB Output is correct
12 Correct 88 ms 17060 KB Output is correct
13 Correct 98 ms 17244 KB Output is correct
14 Correct 109 ms 17032 KB Output is correct
15 Correct 84 ms 16920 KB Output is correct

Subtask #3
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 12212 KB Output is correct
2 Correct 11 ms 12212 KB Output is correct
3 Correct 9 ms 12208 KB Output is correct
4 Correct 10 ms 12132 KB Output is correct
5 Correct 9 ms 12220 KB Output is correct
6 Correct 104 ms 16968 KB Output is correct
7 Correct 86 ms 16500 KB Output is correct
8 Correct 97 ms 16588 KB Output is correct
9 Correct 97 ms 16864 KB Output is correct
10 Correct 102 ms 16804 KB Output is correct
11 Correct 88 ms 17180 KB Output is correct
12 Correct 88 ms 17060 KB Output is correct
13 Correct 98 ms 17244 KB Output is correct
14 Correct 109 ms 17032 KB Output is correct
15 Correct 84 ms 16920 KB Output is correct
16 Correct 886 ms 47884 KB Output is correct
17 Correct 679 ms 44252 KB Output is correct
18 Correct 841 ms 45348 KB Output is correct
19 Correct 779 ms 47060 KB Output is correct
20 Correct 753 ms 47432 KB Output is correct
21 Correct 901 ms 49680 KB Output is correct
22 Correct 830 ms 48692 KB Output is correct
23 Correct 845 ms 49808 KB Output is correct
24 Correct 897 ms 48644 KB Output is correct
25 Correct 783 ms 47528 KB Output is correct