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Submission #241697

# Submission time Handle Problem Language Result Execution time Memory
241697 2020-06-25T09:30:20 Z atoiz Duathlon (APIO18_duathlon) C++14
0 / 100
 65 ms 18168 KB 
#include <stdio.h>

#define N 100007
#define M 400007
int n, m, to[M], nx[M], st[N], low[N], vis[N], ts, stk[N], instack[N], *top = &stk[0];
int bto[N * 4], bnx[N * 4], bst[N * 2], b, bm, bsz[N * 2];
long long ans = 0;

inline void minimize(int &i, int j) { (i > j ? i = j : 0); }

void build(int u, int p)
{
	low[u] = vis[u] = ++ts;
	instack[*(++top) = u] = 1;

	int i, v, c = 0;
	for (i = st[u]; i; i = nx[i]) if (to[i] != p) {
		v = to[i];
		if (!vis[v]) {
			++c;
			build(v, u);
			if (low[v] >= vis[u]) {
				++b;
				bool cont = true;
				while (cont) {
					instack[v = (*top--)] = 0;
					cont = (v != u);
					++bm, bnx[bm] = bst[v], bto[bst[v] = bm] = b;
					++bm, bnx[bm] = bst[b], bto[bst[b] = bm] = v;
				}
				instack[(*++top) = u] = 1;
			}
			minimize(low[u], low[v]);
		} else if (instack[v]) {
			minimize(low[u], vis[v]);
		}
	}
}

void solve(int u, int p)
{
	int i, v, d = 0;
	long long x = 0;

	bsz[u] = (u <= n);
	for (i = bst[u]; i; i = bnx[i]) if (bto[i] != p) {
		solve(v = bto[i], u), bsz[u] += bsz[v], ++d;
		x += (long long) bsz[v] * (bsz[v] - 1);
	}

	if (u > n) {
		x += (long long) (n - bsz[u]) * (n - bsz[u] - 1);
		ans -= x * d;
	}
}

int main()
{
	int i, u, v;
	scanf("%d %d", &n, &m);
	for (i = 1; i <= m; ++i) {
		scanf("%d %d", &u, &v);
		nx[i * 2] = st[u], to[st[u] = i * 2] = v;
		nx[i * 2 - 1] = st[v], to[st[v] = i * 2 - 1] = u;
	}

	b = n, build(1, 0);
	ans = (long long) n * (n - 1) * (n - 2), solve(1, 0);
	printf("%lld", ans);
}

Compilation message

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:60:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
count_triplets.cpp:62:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &u, &v);
   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 12152 KB Output is correct
2 Correct 48 ms 12160 KB Output is correct
3 Incorrect 41 ms 8824 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 768 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 5 ms 524 KB Output is correct
10 Incorrect 5 ms 384 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 9336 KB Output is correct
2 Correct 55 ms 9208 KB Output is correct
3 Correct 47 ms 9336 KB Output is correct
4 Correct 50 ms 9312 KB Output is correct
5 Correct 60 ms 9336 KB Output is correct
6 Correct 65 ms 18168 KB Output is correct
7 Correct 55 ms 15356 KB Output is correct
8 Correct 55 ms 13688 KB Output is correct
9 Correct 51 ms 12280 KB Output is correct
10 Incorrect 43 ms 7680 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 51 ms 9336 KB Output is correct
2 Correct 48 ms 9336 KB Output is correct
3 Incorrect 54 ms 9464 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -