Submission #36689

#	Time	Username	Problem	Language	Result	Execution time	Memory
36689		RockyB	Sailing Race (CEOI12_race)	C++14	10 / 100	6 ms	32768 KiB

race

/// In The Name Of God

#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,sse3,sse4,popcnt,abm,mmx")

#include <bits/stdc++.h>

#define f first
#define s second

#define pb push_back
#define pp pop_back
#define mp make_pair

#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()

#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);

#define nl '\n'
#define ioi exit(0);

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

const int N = (int)150 + 7, inf = (int)1e9 + 7, mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;
const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1}, dy[] = {0, 1, 0, -1, 1, -1, 1, -1};

using namespace std;

int n, k;
vector <int> g[N];
bool ok[N][N];

int dp[N][N][N][2];
int calc(int v, int l, int r, int type) {
	if (~dp[v][l][r][type]) return dp[v][l][r][type];
	int res = 0;
	for (auto to : g[v]) {
		if (to == l || to == r) continue;
		if (type) {
			if (l < to && to < r) {
				res = max(res, max(calc(to, l, to, type), calc(to, to, r, type)) + 1);
			}
		}
	}
	//cerr << v << ' ' << l << ' ' << r << ' ' << type << ' ' << res << nl;
	return dp[v][l][r][type] = res;
}
int main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
	#endif
	scanf ("%d%d", &n, &k);
	assert(0 <= k && k <= 1);
	for (int i = 1; i <= n; i++) {
		int to;
		while (scanf ("%d", &to) && to) {
			ok[i][to] = 1;
			g[i].pb(to);
		}
	}
	if (n == 1) {
		cout << 0 << nl << 1;
		ioi
	}
	if (!k) {
		int mx = -inf, opt = -1;
		memset(dp, -1, sizeof(dp));
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= n; j++) {
				if (i == j || !ok[i][j]) continue;
				int now = calc(j, min(i, j), max(i, j), 1) + 1;
				if (now > mx) {
					mx = now;
					opt = i;
				}
			}
		}
		cout << mx << nl << opt;
		ioi
	}
	ioi
}

Compilation message (stderr)

race.cpp: In function 'int main()':
race.cpp:57:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%d", &n, &k);
                        ^

• Subtask 1: 10 / 100