oj.uz

Submission #140572

# Submission time Handle Problem Language Result Execution time Memory
140572 2019-08-03T15:02:03 Z luciocf Street Lamps (APIO19_street_lamps) C++14
40 / 100
 5000 ms 16916 KB 
#include <bits/stdc++.h>

using namespace std;

typedef pair<int, int> pii;

const int maxn = 3e5+10;

struct Op
{
	int type;
	int ind;
} query[maxn];

struct E
{
	int type;
	int l, r;
} event[maxn];

int n, q;

int last[maxn];
int ans[maxn];

int pai[maxn], peso[maxn];
int edge[maxn], nivel[maxn];

bool on[maxn];
bool mark[maxn];

void init(void)
{
	for (int i = 1; i <= n+1; i++)
		pai[i] = i, peso[i] = 1;
}

int Find(int x)
{
	if (pai[x] == x) return x;
	return Find(pai[x]);
}

void Join(int x, int y, int t)
{
	x = Find(x), y = Find(y);
	if (x == y) return;

	if (peso[x] < peso[y]) swap(x, y);

	pai[y] = x, peso[x] += peso[y];
	edge[y] = t;
}

int dfs(int u, int p)
{
	if (u == p) return 0;

	return nivel[u] = dfs(pai[u], p)+1;
}

int lca(int u, int v)
{
	int ans = 0;

	while (u != v)
	{
		if (nivel[u] > nivel[v]) ans = max(ans, edge[u]), u = pai[u];
		else ans = max(ans, edge[v]), v = pai[v];
	}

	return ans;
}

void solve_small(void)
{
	for (int i = 1; i <= q; i++)
	{
		string op;
		cin >> op;

		if (op == "toggle")
		{
			int ind;
			scanf("%d", &ind);

			query[i] = {0, ind};
		}
		else
		{
			int l, r;
			scanf("%d %d", &l, &r);

			query[i] = {1, -1};

			int ans = 0;
			for (int j = 1; j <= n; j++)
				mark[j] = on[j];

			for (int j = 1; j <= i; j++)
			{
				if (query[j].type == 1)
				{
					bool ok = 1;
					for (int k = l; k < r; k++)
						if (!mark[k])
							ok = 0;

					if (ok) ans++;
				}
				else
				{

					bool ok = 1;
					for (int k = l; k < r; k++)
						if (!mark[k])
							ok = 0;

					if (ok) ans++;

					mark[query[j].ind] = !mark[query[j].ind];
				}
			}

			printf("%d\n", ans);
		}
	}
}

void solve_two(void)
{
	for (int i = 1; i <= q; i++)
	{
		if (event[i].type == 0)
		{
			int ind = event[i].l;

			on[ind] = !on[ind];

			if (!on[ind])
				ans[ind] += (i-last[ind]);

			last[ind] = i;
		}
		else
		{
			int l = event[i].l, r = event[i].r;

			int tot = ans[l];

			if (on[l]) tot += (i-last[l]);

			printf("%d\n", tot);
		}
	}
}

int main(void)
{
	scanf("%d %d", &n, &q);

	init();

	for (int i = 1; i <= n; i++)
	{
		char x;
		scanf(" %c", &x);

		if (x == '1')
		{
			on[i] = true;
			Join(i, i+1, 0);
		}
	}

	if (n <= 100 && q <= 100)
	{
		solve_small();
		return 0;
	}

	bool ok = 1;

	for (int i = 1; i <= q; i++)
	{
		string s;
		cin >> s;

		if (s == "toggle")
		{
			int ind;
			scanf("%d", &ind);

			event[i] = {0, ind, -1};

			Join(ind, ind+1, i);
		}
		else
		{
			int l, r;
			scanf("%d %d", &l, &r);

			event[i] = {1, l, r};

			if (r != l+1) ok = 0;
		}
	}

	if (ok)
	{
		solve_two();
		return 0;
	}

	for (int i = 1; i <= n; i++)
		dfs(i, Find(i));

	for (int i = 1; i <= q; i++)
	{
		if (event[i].type)
		{
			int l = event[i].l, r = event[i].r;

			int first = lca(l, r);

			if (first > i || Find(l) != Find(r)) printf("0\n");
			else printf("%d\n", i-first);
		}
	}
}

Compilation message

street_lamps.cpp: In function 'void solve_two()':
street_lamps.cpp:147:24: warning: unused variable 'r' [-Wunused-variable]
    int l = event[i].l, r = event[i].r;
                        ^
street_lamps.cpp: In function 'void solve_small()':
street_lamps.cpp:85:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &ind);
    ~~~~~^~~~~~~~~~~~
street_lamps.cpp:92:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d", &l, &r);
    ~~~~~^~~~~~~~~~~~~~~~~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:160:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &q);
  ~~~~~^~~~~~~~~~~~~~~~~
street_lamps.cpp:167:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c", &x);
   ~~~~~^~~~~~~~~~~
street_lamps.cpp:192:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &ind);
    ~~~~~^~~~~~~~~~~~
street_lamps.cpp:201:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d", &l, &r);
    ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 237 ms 4872 KB Output is correct
2 Correct 239 ms 4856 KB Output is correct
3 Correct 250 ms 4912 KB Output is correct
4 Correct 307 ms 10756 KB Output is correct
5 Correct 311 ms 9848 KB Output is correct
6 Correct 297 ms 10784 KB Output is correct
7 Correct 286 ms 6748 KB Output is correct
8 Correct 297 ms 9672 KB Output is correct

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 3 ms 376 KB Output is correct
3 Correct 3 ms 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 313 ms 13176 KB Output is correct
6 Correct 325 ms 13792 KB Output is correct
7 Correct 339 ms 14416 KB Output is correct
8 Correct 308 ms 16916 KB Output is correct
9 Correct 192 ms 6944 KB Output is correct
10 Correct 214 ms 7404 KB Output is correct
11 Correct 209 ms 7672 KB Output is correct
12 Execution timed out 5072 ms 12184 KB Time limit exceeded
13 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 5096 ms 376 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 237 ms 4872 KB Output is correct
9 Correct 239 ms 4856 KB Output is correct
10 Correct 250 ms 4912 KB Output is correct
11 Correct 307 ms 10756 KB Output is correct
12 Correct 311 ms 9848 KB Output is correct
13 Correct 297 ms 10784 KB Output is correct
14 Correct 286 ms 6748 KB Output is correct
15 Correct 297 ms 9672 KB Output is correct
16 Correct 3 ms 376 KB Output is correct
17 Correct 3 ms 376 KB Output is correct
18 Correct 3 ms 376 KB Output is correct
19 Correct 3 ms 376 KB Output is correct
20 Correct 313 ms 13176 KB Output is correct
21 Correct 325 ms 13792 KB Output is correct
22 Correct 339 ms 14416 KB Output is correct
23 Correct 308 ms 16916 KB Output is correct
24 Correct 192 ms 6944 KB Output is correct
25 Correct 214 ms 7404 KB Output is correct
26 Correct 209 ms 7672 KB Output is correct
27 Execution timed out 5072 ms 12184 KB Time limit exceeded
28 Halted 0 ms 0 KB -