Submission #79045

#	Time	Username	Problem	Language	Result	Execution time	Memory
79045		psmao	Sailing Race (CEOI12_race)	C++14	5 / 100	175 ms	2912 KiB

race

#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], n, sub;
VI adj[maxn];

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)
	{
		int x;
		while(1)
		{
			sf("%d",&x);
			if(!x) break;
			adj[i].pb(x);
		}
	}
	fo(len,2,n)
	{
		fo(i,1,n-len+1)
		{
			int j = i+len-1;
			for(auto k : adj[i])
			{
				if(k >= i && k < j) 
					gmax(f[i][j], 1 + max(f[k][j], g[k][i]));
				if(!(k > i && k <= j))
					gmax(g[i][j], 1 + max(g[k][j], f[k][i]));
			}
			for(auto k : adj[j])
			{
				if(!(k > i && k <= j))
					gmax(f[j][i], 1 + max(f[k][i], g[k][j]));
				if(k >= i && k < j)
					gmax(g[j][i], 1 + max(g[k][i], f[k][j]));
			}
		}
	}
	int ans = 0, target;
	fo(s,1,n) 
		for(auto t : adj[s])
		{
			if(max(f[s][t], g[s][t]) + 1 > ans)
			{
				ans = max(f[s][t], g[s][t]);
				target = s;
			}
			// gmax(ans, max(f[s][t], g[s][t]));
		}
	pf("%d\n%d\n",ans-1,target);
	#ifdef MPS
		pf("Time Elapsed: %.3fms\n",clock()-mps);
	#endif
	return 0;
}

Compilation message (stderr)

race.cpp: In function 'int main()':
race.cpp:45:4: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  sf("%d%d",&n,&sub);
    ^
race.cpp:51:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    sf("%d",&x);
      ^

• Subtask 1: 5 / 100