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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#611167 | #7040. Connected Subgraphs | ucup-team4906# | WA | 1135ms | 15700kb | C++20 | 2.7kb | 2024-10-04 19:43:10 | 2024-10-04 19:43:13 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
using ll = long long;
using vi = vector<int>;
using vii = vector<vi>;
using vl = vector<ll>;
const int mod = 1e9 + 7;
ll qpow(ll x, ll k)
{
ll res = 1;
while (k)
{
if (k & 1) res = res * x % mod;
k >>= 1;
x = x * x % mod;
}
return res;
}
void add(ll &a, ll b)
{
a += b;
if (a >= mod) a -= mod;
if (a < 0) a += mod;
}
void solve(void)
{
int n, m;
cin >> n >> m;
ll cnt3 = 0, cnt4 = 0;
vi deg(n + 2), vis(n + 2);
vii pre(n + 2), nxt(n + 2);
for (int i = 1; i <= m; i++)
{
int u, v;
cin >> u >> v;
pre[u].pb(v), deg[u]++;
pre[v].pb(u), deg[v]++;
}
for (int u = 1; u <= n; u++)
for (auto v : pre[u])
if (deg[u] < deg[v] || deg[u] == deg[v] && u < v)
nxt[u].pb(v);
ll ce = 0;
ll ans = 0;
for (int u = 1; u <= n; u++)
{
for (int v : nxt[u])
vis[v] = 1;
for (int v : nxt[u])
for (int w : nxt[v])
{
add(cnt3, vis[w]);
if (vis[w])
{
assert(deg[u] >= 2);
add(ce, deg[u] - 2);
assert(deg[v] >= 2);
add(ce, deg[v] - 2);
assert(deg[w] >= 2);
add(ce, deg[w] - 2);
}
}
for (int v : nxt[u])
vis[v] = 0;
}
for (int u = 1; u <= n; u++)
{
for (int v : pre[u])
for (int w : nxt[v])
if (deg[u] < deg[w] || deg[u] == deg[w] && u < w)
add(cnt4, vis[w]++);
for (int v : pre[u])
for (int w : nxt[v])
vis[w] = 0;
}
ll sum = 0;
for (int u = 1; u <= n; u++)
{
ll s1 = 0, s2 = 0;
for (auto v : pre[u])
{
s1 += deg[v] - 1;
s2 += 1LL * (deg[v] - 1) * (deg[v] - 1);
}
if (deg[u] >= 4)
{
ll c = deg[u];
add(ans, c * (c - 1) % mod * (c - 2) % mod * (c - 3) % mod * qpow(2, mod - 2) % mod
* qpow(3, mod - 2) % mod * qpow(4, mod - 2) % mod);
}
add(sum, (s1 * s1 - s2) / 2 % mod);
}
add(sum, - 3 * cnt3 % mod);
add(sum, - 4 * cnt4 % mod);
add(sum, - 2 * ce % mod);
add(ans, sum);
add(ans, cnt4);
add(ans, ce);
cout << ans << "\n";
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
int T = 1;
cin >> T;
for (int i = 1; i <= T; i++)
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3552kb
input:
2 4 4 1 2 2 3 3 4 4 1 4 6 1 2 1 3 1 4 2 3 2 4 3 4
output:
1 15
result:
ok 2 lines
Test #2:
score: -100
Wrong Answer
time: 1135ms
memory: 15700kb
input:
10 3296 174079 484 736 80 3275 914 1609 611 2069 1111 3027 749 1443 568 1878 1180 2788 1072 2156 171 797 106 1226 1749 2331 758 3080 772 2017 1381 2393 1945 2943 269 1431 1640 1805 1924 2161 1720 2123 1551 2940 286 1226 460 1462 1807 1823 40 638 18 707 589 849 1857 1987 914 2360 2446 3129 24 910 113...
output:
153317701 70501661 316115278 1293594 211022166 12354585 22909021 24606401 419368998 462948480
result:
wrong answer 1st lines differ - expected: '192810800', found: '153317701'