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Submission #36784

# Submission time Handle Problem Language Result Execution time Memory
36784 2017-12-14T15:10:26 Z RockyB Sailing Race (CEOI12_race) C++14
75 / 100
 1496 ms 6308 KB 
/// 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)500 + 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][2];
int dp1[N][N][2];
 
int nxt(int x) {
	if (x == 1) return n;
	return x - 1;
}
int prv(int x) {
	if (x == n) return 1;
	return x + 1;
}
int calc(int A, int B, int t) {
	if (~dp[A][B][t]) return dp[A][B][t];
	int res = 0;
	if (t) {
		for (int i = nxt(A); i != B; i = nxt(i)) {
			if (ok[B][i]) {
				res = max(res, calc(A, i, 1) + 1);
				res = max(res, calc(B, i, 0) + 1);
			}
		}
	}
	else {
		for (int i = prv(A); i != B; i = prv(i)) {
			if (ok[B][i]) {
				res = max(res, calc(A, i, 0) + 1);
				res = max(res, calc(B, i, 1) + 1);
			}		
		}
	}
	return dp[A][B][t] = res;
}	
 
int f(int A, int B, int t) {
	if (A == B) return 0;
	if (~dp1[A][B][t]) return dp1[A][B][t];
	int res = -inf;
	if (t) {
		for (int i = nxt(A); ; i = nxt(i)) {
			if (ok[A][i]) res = max(res, f(i, B, 1) + 1);
			if (i == B) break;
		}
	}
	else {
		for (int i = prv(A); ; i = prv(i)) {
			if (ok[A][i]) res = max(res, f(i, B, 0) + 1);
			if (i == B) break;
		}
	}
	return dp1[A][B][t] = res;
}
 
int mx, opt;
int res[N];
void bye() {
	printf ("%d\n%d", mx, opt);
	ioi
}
void solve() {
	memset(dp1, -1, sizeof(dp1));
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
	 		f(i, j, 0), f(i, j, 1);
		}
	}
	for (int j = 1; j <= n; j++) {
		for (int l = prv(j); l != j; l = prv(l)) {
			int mxi = -inf, opti = -1;
			for (int r = prv(l); r != j; r = prv(r)) {
				///case1
				if (opti != -1 && ok[r][l] && 2 + dp1[j][r][1] + dp[j][l][0] > mx) {
					mx++;
					opt = opti;
					bye();
				}

				///case2
				if (opti != -1 && ok[r][l] && 2 + mxi + dp1[j][r][1] > mx) {
					mx++;
					opt = opti;
					bye();
				}

				///case3
				if (opti != -1 && ok[r][l] && 2 + dp1[j][l][0] + dp[j][r][1] > mx) {
					mx++;
					opt = opti;
					bye();
				}

				if (ok[r][j] && dp[r][l][1] > mxi) {
					mxi = dp[r][l][1];
					opti = r;
				}
			}
		}
	}
	assert(0);
	/*for (int j = 1; j <= n; j++) {
		for (int r = nxt(j); r != j; r = nxt(r)) {
			int mxl = -inf;
			for (int l = prv(j); l != r; l = prv(l)) {
				///case4
				if (ok[l][j] && mxl + 2 + dp[l][r][0] > mx) {
					mx++;
					opt = l;
					bye();
				}
				if (ok[l][r] && dp1[j][l][0] > mxl) {
					mxl = dp1[j][l][0];
				}
			}
		}
	}*/
}
int main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
	#endif
	scanf ("%d%d", &n, &k);
	for (int i = 1; i <= n; i++) {
		int to;
		while (scanf ("%d", &to) && to) {
			ok[i][to] = 1;
		}
	}
	memset(dp, -1, sizeof(dp));
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
			calc(i, j, 0), calc(i, j, 1);
			if (ok[i][j]) res[i] = max(res[i], max(calc(i, j, 0), calc(i, j, 1)) + 1);
			if (res[i] > mx) mx = res[i], opt = i;
		}
	}
	if (k == 1) solve();
	else bye();
	bye();
	ioi
}

Compilation message

race.cpp: In function 'int main()':
race.cpp:157:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%d", &n, &k);
                        ^

Subtask #1
75.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 6304 KB Output is correct
2 Runtime error 0 ms 6308 KB Execution killed because of forbidden syscall gettid (186)
3 Correct 3 ms 6304 KB Output is correct
4 Correct 0 ms 6304 KB Output is correct
5 Correct 0 ms 6304 KB Output is correct
6 Correct 3 ms 6304 KB Output is correct
7 Correct 3 ms 6304 KB Output is correct
8 Correct 6 ms 6304 KB Output is correct
9 Correct 3 ms 6304 KB Output is correct
10 Correct 6 ms 6304 KB Output is correct
11 Correct 13 ms 6304 KB Output is correct
12 Correct 99 ms 6304 KB Output is correct
13 Runtime error 259 ms 6308 KB Execution killed because of forbidden syscall gettid (186)
14 Correct 203 ms 6304 KB Output is correct
15 Runtime error 1496 ms 6308 KB Execution killed because of forbidden syscall gettid (186)
16 Correct 1223 ms 6304 KB Output is correct
17 Runtime error 1426 ms 6308 KB Execution killed because of forbidden syscall gettid (186)
18 Correct 373 ms 6304 KB Output is correct
19 Correct 1356 ms 6304 KB Output is correct
20 Incorrect 1296 ms 6304 KB Output isn't correct