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답안 #370788

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
370788 2021-02-24T15:39:06 Z luciocf 철인 이종 경기 (APIO18_duathlon) C++14
31 / 100
 143 ms 41376 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxn = 3e5+10;

int n;
int in[maxn], low[maxn], id[maxn], tt, cc;

bool is[maxn];

int sz[maxn], sub[maxn];
int comp_tree[maxn], sz_comp[maxn];

bool solved[maxn];

vector<int> grafo[maxn], tree[maxn], stk;

vector<vector<int>> comp;

void dfs(int u, int p)
{
	in[u] = low[u] = ++tt;
	stk.push_back(u);

	for (auto v: grafo[u])
	{
		if (v == p) continue;

		if (in[v]) low[u] = min(low[u], in[v]);
		else
		{
			dfs(v, u);

			low[u] = min(low[u], low[v]);

			if (low[v] >= in[u])
			{
				is[u] = (in[u] > 1 || in[v] > 2);

				comp.push_back({u});

				while (stk.back() != u)
				{
					comp.back().push_back(stk.back());
					stk.pop_back();
				}
			}
		}
	}
}

void build(void)
{
	for (int i = 1; i <= n; i++)
	{
		if (is[i])
		{
			id[i] = ++cc;
			sz[cc]++;
		}
	}


	for (auto &C: comp)
	{	
		cc++;

		for (auto u: C)
		{
			if (!is[u])
			{
				id[u] = cc;
				sz[cc]++;
			}
			else
			{
				tree[id[u]].push_back(cc);
				tree[cc].push_back(id[u]);
			}
		}
	}
}

ll ans;

ll choose2(int n)
{
	return 1ll*n*(n-1)/2ll;
}

ll choose3(int n)
{
	return 1ll*n*(n-1)*(n-2)/6ll;
}

void calc(int u, int p, int cc)
{
	comp_tree[u] = cc;
	sz_comp[cc] += sz[u];

	sub[u] = sz[u];

	for (auto v: tree[u])
	{
		if (v == p) continue;

		calc(v, u, cc);

		sub[u] += sub[v];
	}
}

void solve(int u, int p)
{
	solved[comp_tree[u]] = 1;

	ans += 2ll*choose2(sz[p])*sz[u];
	if (sz[u] >= 3) ans += 6ll*choose3(sz[u]);
	if (sz[u] >= 2) ans += 4ll*choose2(sz[u])*(sub[u]-sz[u] + sz_comp[comp_tree[u]]-sub[u]);

	ans += 2ll*sz[u]*(sz_comp[comp_tree[u]]-sub[u])*(sub[u]-sz[u]);

	int soma = 0;

	for (auto v: tree[u])
	{
		if (v == p) continue;

		ans += 2ll*sz[u]*soma*sub[v];
		soma += sub[v];

		ans += 2ll*choose2(sz[v])*sz[u];

		solve(v, u);
	}
}

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

	for (int i = 1; i <= m; i++)
	{
		int u, v;
		scanf("%d %d", &u, &v);

		grafo[u].push_back(v);
		grafo[v].push_back(u);
	}

	for (int i = 1; i <= n; i++)
		if (!in[i])
			dfs(i, 0);

	build();

	int cc_tree = 0;

	for (int i = 1; i <= 2*n; i++)
		if (!comp_tree[i])
			calc(i, 0, ++cc_tree);

	for (int i = 1; i <= 2*n; i++)
		if (!solved[comp_tree[i]])
			solve(i, 0);

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

Compilation message

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:144:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  144 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
count_triplets.cpp:149:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  149 |   scanf("%d %d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14572 KB Output is correct
2 Correct 9 ms 14444 KB Output is correct
3 Correct 9 ms 14444 KB Output is correct
4 Correct 9 ms 14444 KB Output is correct
5 Correct 9 ms 14444 KB Output is correct
6 Correct 9 ms 14444 KB Output is correct
7 Incorrect 9 ms 14444 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14572 KB Output is correct
2 Correct 9 ms 14444 KB Output is correct
3 Correct 9 ms 14444 KB Output is correct
4 Correct 9 ms 14444 KB Output is correct
5 Correct 9 ms 14444 KB Output is correct
6 Correct 9 ms 14444 KB Output is correct
7 Incorrect 9 ms 14444 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 99 ms 33136 KB Output is correct
2 Correct 104 ms 33292 KB Output is correct
3 Correct 126 ms 33952 KB Output is correct
4 Correct 110 ms 32932 KB Output is correct
5 Correct 95 ms 29604 KB Output is correct
6 Correct 121 ms 33056 KB Output is correct
7 Correct 112 ms 31392 KB Output is correct
8 Correct 131 ms 31904 KB Output is correct
9 Correct 118 ms 29984 KB Output is correct
10 Correct 102 ms 29600 KB Output is correct
11 Correct 93 ms 27296 KB Output is correct
12 Correct 90 ms 26912 KB Output is correct
13 Correct 77 ms 26912 KB Output is correct
14 Correct 80 ms 26672 KB Output is correct
15 Correct 61 ms 25760 KB Output is correct
16 Correct 65 ms 25632 KB Output is correct
17 Correct 16 ms 18788 KB Output is correct
18 Correct 16 ms 18788 KB Output is correct
19 Correct 16 ms 18788 KB Output is correct
20 Correct 16 ms 18788 KB Output is correct
21 Correct 16 ms 18660 KB Output is correct
22 Correct 16 ms 18660 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 14700 KB Output is correct
2 Correct 9 ms 14572 KB Output is correct
3 Correct 10 ms 14700 KB Output is correct
4 Correct 10 ms 14700 KB Output is correct
5 Correct 12 ms 14700 KB Output is correct
6 Correct 11 ms 14700 KB Output is correct
7 Correct 10 ms 14700 KB Output is correct
8 Correct 10 ms 14700 KB Output is correct
9 Correct 10 ms 14700 KB Output is correct
10 Correct 10 ms 14572 KB Output is correct
11 Correct 10 ms 14700 KB Output is correct
12 Correct 10 ms 14572 KB Output is correct
13 Correct 10 ms 14572 KB Output is correct
14 Correct 10 ms 14572 KB Output is correct
15 Correct 9 ms 14572 KB Output is correct
16 Correct 12 ms 14572 KB Output is correct
17 Correct 11 ms 14572 KB Output is correct
18 Correct 10 ms 14572 KB Output is correct
19 Correct 9 ms 14700 KB Output is correct
20 Correct 9 ms 14572 KB Output is correct

Subtask #5
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 134 ms 31644 KB Output is correct
2 Correct 128 ms 31772 KB Output is correct
3 Correct 132 ms 31772 KB Output is correct
4 Correct 137 ms 31772 KB Output is correct
5 Correct 139 ms 31660 KB Output is correct
6 Correct 143 ms 41376 KB Output is correct
7 Correct 141 ms 38044 KB Output is correct
8 Correct 135 ms 37404 KB Output is correct
9 Correct 135 ms 35612 KB Output is correct
10 Correct 140 ms 31644 KB Output is correct
11 Correct 126 ms 31732 KB Output is correct
12 Correct 140 ms 31772 KB Output is correct
13 Correct 122 ms 31644 KB Output is correct
14 Correct 120 ms 30876 KB Output is correct
15 Correct 102 ms 29852 KB Output is correct
16 Correct 73 ms 26400 KB Output is correct
17 Correct 79 ms 30680 KB Output is correct
18 Correct 76 ms 30612 KB Output is correct
19 Correct 78 ms 30736 KB Output is correct
20 Correct 83 ms 30620 KB Output is correct

Subtask #6
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14572 KB Output is correct
2 Correct 10 ms 14572 KB Output is correct
3 Incorrect 10 ms 14572 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 131 ms 31772 KB Output is correct
2 Correct 124 ms 31900 KB Output is correct
3 Incorrect 138 ms 30364 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14572 KB Output is correct
2 Correct 9 ms 14444 KB Output is correct
3 Correct 9 ms 14444 KB Output is correct
4 Correct 9 ms 14444 KB Output is correct
5 Correct 9 ms 14444 KB Output is correct
6 Correct 9 ms 14444 KB Output is correct
7 Incorrect 9 ms 14444 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14572 KB Output is correct
2 Correct 9 ms 14444 KB Output is correct
3 Correct 9 ms 14444 KB Output is correct
4 Correct 9 ms 14444 KB Output is correct
5 Correct 9 ms 14444 KB Output is correct
6 Correct 9 ms 14444 KB Output is correct
7 Incorrect 9 ms 14444 KB Output isn't correct
8 Halted 0 ms 0 KB -