oj.uz

Submission #380618

# Submission time Handle Problem Language Result Execution time Memory
380618 2021-03-22T14:06:12 Z skittles1412 Dancing Elephants (IOI11_elephants) C++17
100 / 100
 3657 ms 12396 KB 
#include "bits/stdc++.h"

using namespace std;

//sad; long long double doesn't exist
using ld = long double;

//imagine a language where int = long
#define long long long

//typing too hard
#define endl "\n"

#define sz(x) int(x.size())

const int maxn = 150000, bsize = 400, m = maxn / bsize + 1;

int n, l, cnt = 0;
int arr[maxn], order[maxn];
vector<int> buc[m];
vector<pair<int, int>> vals[m];

void maintain(int ind) {
	int n = sz(buc[ind]);
	vals[ind].resize(n);
	int j = n - 1;
	for(int i = n - 1; i >= 0; i--) {
		while(j >= 0 && buc[ind][j] > buc[ind][i] + l) {
			j--;
		}
		if(j + 1 == n) {
			vals[ind][i] = {buc[ind][i], 1};
		}else {
			vals[ind][i] = vals[ind][j + 1];
			vals[ind][i].second++;
		}
	}
}

void merge() {
	int ind = 0;
	for(auto &i: buc) {
		for(auto &j: i) {
			arr[ind++] = j;
		}
	}
	assert(ind == n);
}

void build() {
	for(int i = 0, ind = 0; i < n; i += bsize, ind++) {
		buc[ind].clear();
		buc[ind].insert(buc[ind].end(), arr + i, arr + min(n, i + bsize));
	}
	for(int i = 0; i < m; i++) {
		maintain(i);
	}
}

void init(int _n, int _l, int _arr[]) {
	n = _n;
	l = _l;
	for(int i = 0; i < n; i++) {
		arr[i] = order[i] = _arr[i];
	}
	build();
}

void remove(int x) {
	for(int i = 0; i < m; i++) {
		if(sz(buc[i]) && buc[i].back() >= x) {
			buc[i].erase(lower_bound(begin(buc[i]), end(buc[i]), x));
			maintain(i);
			return;
		}
	}
	assert(false);
}

void insert(int x) {
	int last = -1;
	for(int i = 0; i < m; i++) {
		if(sz(buc[i])) {
			last = i;
			if(buc[i].back() >= x) {
				buc[i].insert(lower_bound(begin(buc[i]), end(buc[i]), x), x);
				maintain(i);
				return;
			}
		}
	}
	assert(last != -1);
	buc[last].push_back(x);
	maintain(last);
}

int update(int ind, int x) {
	if(++cnt == bsize) {
		merge();
		build();
		cnt = 0;
	}
	remove(order[ind]);
	insert(x);
	order[ind] = x;
	int prev = INT_MIN;
	int ans = 0;
	for(int i = 0; i < m; i++) {
		auto it = lower_bound(begin(buc[i]), end(buc[i]), prev + l + 1);
		if(it != buc[i].end()) {
			auto cur = vals[i][it - buc[i].begin()];
			ans += cur.second;
			prev = cur.first;
		}
	}
	return ans;
}

struct solver {
	int n, l;
	int arr[maxn];

	solver(int n, int l, int arr[]): n(n), l(l) {
		for(int i = 0; i < n; i++) {
			this->arr[i] = arr[i];
		}
	}

	int update(int ind, int x) {
		arr[ind] = x;
		vector<int> tmp(arr, arr + n);
		sort(begin(tmp), end(tmp));
		int ans = 0, prev = INT_MIN;
		for(auto &i: tmp) {
			if(i > prev + l) {
				prev = i;
				ans++;
			}
		}
		return ans;
	}
};

void reset() {
	cnt = 0;
	memset(arr, 0, sizeof(arr));
	for(int i = 0; i < m; i++) {
		buc[i].clear();
		vals[i].clear();
	}
}

void stress() {
	mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());
	auto rint = [&mt](int l, int r) {return l + mt() % (r - l + 1);};
	while(true) {
		reset();
		int n = rint(2, 5), l = rint(0, 100), q = rint(2, 5);
		int arr[n];
		for(int i = 0; i < n; i++) {
			arr[i] = rint(0, 100);
		}
		sort(arr, arr + n);
		init(n, l, arr);
		solver s(n, l, arr);
		vector<pair<int, int>> qs;
		while(q--) {
			int ind = rint(0, n - 1), x = rint(0, 100);
			qs.emplace_back(ind, x);
			int a = update(ind, x), b = s.update(ind, x);
			if(a != b) {
				cerr << n << " " << l << endl;
				for(auto &i: arr) {
					cerr << i << " ";
				}
				cerr << endl;
				for(auto &i: qs) {
					cerr << i.first << " " << i.second << endl;
				}
				cerr << a << " " << b << endl << endl;
			}
		}
	}
}

void grade() {
	reset();
	int n, l, q;
	cin >> n >> l >> q;
	int arr[n];
	for(int i = 0; i < n; i++) {
		scanf("%d", &arr[i]);
	}
	int ii[q], yy[q], sol[q];
	for(int i = 0; i < q; i++) {
		scanf("%d%d%d", &ii[i], &yy[i], &sol[i]);
	}

	init(n, l, arr);
	for(int i = 0; i < q; i++) {
		int ans = update(ii[i], yy[i]);
		if(ans != sol[i]) {
			printf("Incorrect.  In %d-th move, answered %d (%d expected).\n", i + 1, ans, sol[i]);
			return;
		}
	}
	printf("Correct.\n");
}

int main1412() {
//	stress();
//	freopen("elephants-test/subtask4/grader.in.1", "r", stdin);
	freopen("input.txt", "r", stdin);
	grade();
	using namespace filesystem;
	for(auto &subtask: directory_iterator("elephants-test")) {
		char last = subtask.path().string().back();
		if(isdigit(last)) {
			printf("Grading subtask %d:\n", last - '0');
			map<int, string> tests;
			for(auto &test: directory_iterator(subtask)) {
				string path = test.path().string();
				auto ind = path.find("grader.in.");
				if(ind != string::npos) {
					tests[stoi(path.substr(ind + 10))] = path;
				}
			}
			for(auto &test: tests) {
				printf("Grading case %d: ", test.first);
				freopen(test.second.c_str(), "r", stdin);
				grade();
			}
			printf("\n");
		}
	}
}

Compilation message

elephants.cpp: In function 'int main1412()':
elephants.cpp:236:1: warning: no return statement in function returning non-void [-Wreturn-type]
  236 | }
      | ^
elephants.cpp: In function 'void grade()':
elephants.cpp:192:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  192 |   scanf("%d", &arr[i]);
      |   ~~~~~^~~~~~~~~~~~~~~
elephants.cpp:196:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  196 |   scanf("%d%d%d", &ii[i], &yy[i], &sol[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'int main1412()':
elephants.cpp:213:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  213 |  freopen("input.txt", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
elephants.cpp:230:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  230 |     freopen(test.second.c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 353 ms 2412 KB Output is correct
8 Correct 375 ms 2668 KB Output is correct
9 Correct 357 ms 3992 KB Output is correct
10 Correct 349 ms 3436 KB Output is correct
11 Correct 309 ms 3436 KB Output is correct
12 Correct 607 ms 4332 KB Output is correct
13 Correct 323 ms 3308 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 353 ms 2412 KB Output is correct
8 Correct 375 ms 2668 KB Output is correct
9 Correct 357 ms 3992 KB Output is correct
10 Correct 349 ms 3436 KB Output is correct
11 Correct 309 ms 3436 KB Output is correct
12 Correct 607 ms 4332 KB Output is correct
13 Correct 323 ms 3308 KB Output is correct
14 Correct 355 ms 3308 KB Output is correct
15 Correct 547 ms 3436 KB Output is correct
16 Correct 1039 ms 4972 KB Output is correct
17 Correct 1072 ms 5740 KB Output is correct
18 Correct 1149 ms 5740 KB Output is correct
19 Correct 525 ms 5100 KB Output is correct
20 Correct 1075 ms 5828 KB Output is correct
21 Correct 1034 ms 5868 KB Output is correct
22 Correct 525 ms 4460 KB Output is correct

Subtask #5
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 353 ms 2412 KB Output is correct
8 Correct 375 ms 2668 KB Output is correct
9 Correct 357 ms 3992 KB Output is correct
10 Correct 349 ms 3436 KB Output is correct
11 Correct 309 ms 3436 KB Output is correct
12 Correct 607 ms 4332 KB Output is correct
13 Correct 323 ms 3308 KB Output is correct
14 Correct 355 ms 3308 KB Output is correct
15 Correct 547 ms 3436 KB Output is correct
16 Correct 1039 ms 4972 KB Output is correct
17 Correct 1072 ms 5740 KB Output is correct
18 Correct 1149 ms 5740 KB Output is correct
19 Correct 525 ms 5100 KB Output is correct
20 Correct 1075 ms 5828 KB Output is correct
21 Correct 1034 ms 5868 KB Output is correct
22 Correct 525 ms 4460 KB Output is correct
23 Correct 2646 ms 12252 KB Output is correct
24 Correct 3089 ms 12268 KB Output is correct
25 Correct 2205 ms 11756 KB Output is correct
26 Correct 2561 ms 10756 KB Output is correct
27 Correct 2477 ms 10608 KB Output is correct
28 Correct 1265 ms 5484 KB Output is correct
29 Correct 1203 ms 5356 KB Output is correct
30 Correct 1245 ms 5356 KB Output is correct
31 Correct 1212 ms 5356 KB Output is correct
32 Correct 1701 ms 10188 KB Output is correct
33 Correct 1791 ms 9580 KB Output is correct
34 Correct 1998 ms 10396 KB Output is correct
35 Correct 1765 ms 12396 KB Output is correct
36 Correct 1257 ms 10092 KB Output is correct
37 Correct 2715 ms 12228 KB Output is correct
38 Correct 1823 ms 9452 KB Output is correct
39 Correct 1874 ms 10604 KB Output is correct
40 Correct 1989 ms 9660 KB Output is correct
41 Correct 3609 ms 12080 KB Output is correct
42 Correct 3657 ms 12324 KB Output is correct