#include <bits/stdc++.h>
using namespace std;
#define fo(i,s,t) for(int i = s; i <= t; ++ i)
#define fd(i,s,t) for(int i = s; i >= t; -- i)
#define bf(i,s) for(int i = head[s]; i; i = e[i].next)
#define mp make_pair
#define fi first
#define se second
#define pii pair<int,int>
#define pb push_back
#define VI vector<int>
#define sf scanf
#define pf printf
#define fp freopen
#define SZ(x) ((int)(x).size())
#ifdef MPS
#define D(x...) printf(x)
#else
#define D(x...)
#endif
typedef long long ll;
typedef double db;
typedef unsigned long long ull;
const int inf = 1<<30;
const ll INF = 1ll<<60;
const db Inf = 1e20;
const db eps = 1e-9;
void gmax(int &a,int b){a = (a > b ? a : b);}
void gmin(int &a,int b){a = (a < b ? a : b);}
const int maxn = 505;
int f[maxn][maxn], g[maxn][maxn], md[maxn][maxn], mdc[maxn][maxn], n, sub;
VI adj[maxn], radj[maxn];
int dis(int x, int y)
{
if(x > y) swap(x, y);
return min(y-x, n-(y-x));
}
int main()
{
#ifdef MPS
fp("1.in","r",stdin);
fp("1.out","w",stdout);
db mps = clock();
#endif
sf("%d%d",&n,&sub);
fo(i,1,n) fo(j,1,n) md[i][j] = mdc[i][j] = -inf;
fo(i,1,n)
{
int x;
while(1)
{
sf("%d",&x);
if(!x) break;
adj[i].pb(x);
radj[x].pb(i);
md[i][x] = mdc[i][x] = 1;
}
}
fo(len,2,n)
{
fo(i,1,n)
{
int j = i+len-1;
if(j > n) j = j - n;
for(auto k : adj[i])
{
if(i < j)
{
if(k >= i && k < j)
{
gmax(f[i][j], 1 + max(f[k][j], g[k][i]));
gmax(md[i][j], 1 + md[k][j]);
}
}
else
{
if(k >= i || k < j)
{
gmax(f[i][j], 1 + max(f[k][j], g[k][i]));
gmax(md[i][j], 1 + md[k][j]);
}
}
}
for(auto k : adj[j])
{
if(i < j)
{
if(k > i && k <= j)
{
gmax(g[j][i], 1 + max(g[k][i], f[k][j]));
gmax(mdc[j][i], 1 + mdc[k][i]);
}
}
else
{
if(k > i || k <= j)
{
gmax(g[j][i], 1 + max(g[k][i], f[k][j]));
gmax(mdc[j][i], 1 + mdc[k][i]);
}
}
}
D("%d %d %d %d\n",i,j,md[i][j],mdc[j][i]);
}
}
int ans = 0, target;
fo(s,1,n)
for(auto t : adj[s])
{
if(max(f[t][s], g[t][s]) + 1 > ans)
{
ans = max(f[t][s], g[t][s]) + 1;
target = s;
}
}
if(sub == 1)
{
fo(C,1,n)
fo(B,1,n) if(B != C)
{
//case 1 : BAC counterclockwise
if(C < B)
{
int A = 0;
for(auto x : radj[B])
if(x > B || x < C)
{
if(!A || dis(A,C) > dis(x,C))
A = x;
}
if(A) // there is such A existing
{
// we want to find a D
for(auto D : adj[C])
{
if(A > B) // B<A<=N
{
if(D > B && D < A)
{
if(1 + mdc[B][C] + 1 + max(g[D][B], f[D][A]) > ans)
{
ans = 1 + mdc[B][C] + 1 + max(g[D][B], f[D][A]);
target = A;
D("a%d %d %d %d %d\n",A,B,C,D,ans);
}
}
}
else // 1<A<C<B<N
{
if(D < A || D > B)
{
if(1 + mdc[B][C] + 1 + max(g[D][B], f[D][A]) > ans)
{
ans = 1 + mdc[B][C] + 1 + max(g[D][B], f[D][A]);
target = A;
D("b%d %d %d %d %d\n",A,B,C,D,ans);
}
}
}
}
}
A = 0;
for(auto x : radj[B])
if(x > C && x < B)
{
if(!A || dis(A,C) > dis(x,C))
A = x;
}
if(A)
{
for(auto D : adj[C])
{
if(D > A && D < B)
{
if(1 + md[B][C] + 1 + max(f[D][B], g[D][A]) > ans)
{
ans = 1 + md[B][C] + 1 + max(f[D][B], g[D][A]);
target = A;
D("c%d %d %d %d %d\n",A,B,C,D,ans);
}
}
}
}
}
else //case 2 : BAC clockwise
{
int A = 0;
for(auto x : radj[B])
if(x < B || x > C)
{
if(!A || dis(A,C) > dis(x,C))
A = x;
}
if(A)
{
for(auto D : adj[C])
{
if(A > C)
{
if(D < B || D > A)
{
if(1 + md[B][C] + 1 + max(f[D][B], g[D][A]) > ans)
{
ans = 1 + md[B][C] + 1 + max(f[D][B], g[D][A]);
target = A;
D("d%d %d %d %d %d\n",A,B,C,D,ans);
}
}
}
else
{
if(D > A && D < B)
{
if(1 + md[B][C] + 1 + max(f[D][B], g[D][A]) > ans)
{
ans = 1 + md[B][C] + 1 + max(f[D][B], g[D][A]);
target = A;
D("e%d %d %d %d %d\n",A,B,C,D,ans);
}
}
}
}
}
A = 0;
for(auto x : radj[B])
if(x > B && x < C)
{
if(!A || dis(A,C) > dis(x,C))
A = x;
}
if(A)
{
for(auto D : adj[C])
if(D > B && D < A)
{
if(1 + mdc[B][C] + 1 + max(f[D][A], g[D][B]) > ans)
{
ans = 1 + mdc[B][C] + 1 + max(f[D][A], g[D][B]);
target = A;
D("f%d %d %d %d %d\n",A,B,C,D,ans);
}
}
}
}
}
}
pf("%d\n%d\n",ans,target);
#ifdef MPS
pf("Time Elapsed: %.3fms\n",clock()-mps);
#endif
return 0;
}
Compilation message
race.cpp: In function 'int main()':
race.cpp:50:4: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
sf("%d%d",&n,&sub);
^
race.cpp:57:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
sf("%d",&x);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
632 KB |
Output is correct |
| 3 |
Correct |
2 ms |
712 KB |
Output is correct |
| 4 |
Correct |
3 ms |
864 KB |
Output is correct |
| 5 |
Correct |
3 ms |
912 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1204 KB |
Output is correct |
| 7 |
Correct |
5 ms |
1244 KB |
Output is correct |
| 8 |
Correct |
6 ms |
1256 KB |
Output is correct |
| 9 |
Correct |
7 ms |
1404 KB |
Output is correct |
| 10 |
Correct |
18 ms |
1544 KB |
Output is correct |
| 11 |
Correct |
7 ms |
1576 KB |
Output is correct |
| 12 |
Correct |
37 ms |
2492 KB |
Output is correct |
| 13 |
Correct |
69 ms |
3152 KB |
Output is correct |
| 14 |
Correct |
62 ms |
4168 KB |
Output is correct |
| 15 |
Correct |
357 ms |
5308 KB |
Output is correct |
| 16 |
Correct |
464 ms |
5672 KB |
Output is correct |
| 17 |
Correct |
385 ms |
5672 KB |
Output is correct |
| 18 |
Correct |
87 ms |
5672 KB |
Output is correct |
| 19 |
Correct |
538 ms |
5960 KB |
Output is correct |
| 20 |
Correct |
547 ms |
6000 KB |
Output is correct |
