답안 #127052

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
127052 2019-07-08T20:37:38 Z eriksuenderhauf Sailing Race (CEOI12_race) C++11
65 / 100
1202 ms 7672 KB
//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 5e2 + 2;
const int INF = 1e9 + 7;
int ans[MAXN], mx[MAXN][MAXN][2];
int dp[MAXN][MAXN][2], dp2[MAXN][MAXN][2];
bool adj[MAXN][MAXN];
int nex[MAXN][MAXN];
int n;
 
inline bool between(int l, int r, int x) {
    if (l > r)
        return l < x || x < r;
    return l < x && x < r;
}
 
int solve(int l, int r, int k) {// path ends at r, interval at l
    if (dp[l][r][k] != -1) return dp[l][r][k];
    int &ret = dp[l][r][k];
    ret = 0;
    int lo = k ? r : l;
    int hi = l ^ r ^ lo;
    for (int i=1; i <= nex[r][0]; i++)
        if (between(lo, hi, nex[r][i]))
            ret = max(ret, max(solve(r, nex[r][i], k^1),  solve(l, nex[r][i], k)) + 1);
    return ret;
}
 
int f2(int l, int r, int k) {
    if (l == r) return 0;
    if (dp2[l][r][k] != -1) return dp2[l][r][k];
    int ret = adj[l][r] ? 0 : -INF;
    int lo = k ? r : l;
    int hi = l ^ r ^ lo;
    for (int i=1; i <= nex[l][0]; i++)
        if (between(lo, hi, nex[l][i]))
            ret = max(ret, f2(nex[l][i], r, k));
    return dp2[l][r][k] = ret + 1;
}
 
int b[MAXN];

int main() {
    srand(time(0));
    memset(dp, -1, sizeof dp);
    memset(dp2, -1, sizeof dp2);
    int k;
    scanf("%d %d", &n, &k);
    for (int i = 1; i <= n; i++) {
        b[i] = i;
        int x;
        while (1) {
            scanf("%d", &x);
            if (x == 0)
                break;
            adj[i][x] = 1;
            nex[i][++nex[i][0]] = x;
        }
    }
    for (int i = 1; i <= n; i++)
        for (int j=1; j <= nex[i][0]; j++)
            ans[i] = max(ans[i], max(solve(i, nex[i][j], 0), solve(i, nex[i][j], 1)) + 1);
    random_shuffle(b+1,b+n+1);
    if (k == 1) for (int ii = 1; ii <= n; ii++) {
        int i = b[ii];
        memset(mx, 0, sizeof mx);
        for (int x = (i%n) + 1; x != i; x = (x%n) + 1)
            for (int y = (x+1)%n + 1; y != i; y = (y%n) + 1) {
                mx[x][y][0] = mx[x][(y+n-2)%n + 1][0];
                if (adj[i][(y+n-2)%n + 1])
                    mx[x][y][0] = max(mx[x][y][0], dp[x][(y+n-2)%n + 1][0] + 1);
            }
        for (int x = (i+n-2)%n+1; x != i; x = (x-2+n)%n+1)
            for (int y = (x+2*n-3)%n+1; y != i; y = (y-2+n)%n+1) {
                mx[y][x][1] = mx[y%n+1][x][1];
                if (adj[i][y%n+1])
                    mx[y][x][1] = max(mx[y][x][1], dp[x][y%n+1][1] + 1);
            }
 
        for (int l = i%n+1; l != (i+2*n-3)%n+1; l = (l%n) + 1)
            for (int j = (l+1)%n+1; j != i; j = (j%n) + 1) {
                if (adj[l][j])
                    ans[l] = max(ans[l], max(f2(j, i, 0) + mx[l][j][0], f2(j, i, 0) + mx[l][j][1]) + 1);
                if (adj[j][l])
                    ans[j] = max(ans[j], max(f2(l, i, 1) + mx[l][j][0], f2(l, i, 1) + mx[l][j][1]) + 1);
            }
        if (ans[i] == n || rand() % 400 == 1) break;
    }
    int ind = 0;
    for (int i = 1; i <= n; i++)
        if (ans[ind] < ans[i])
            ind = i;
    printf("%d\n%d\n", ans[ind], ind);
    return 0;
}

Compilation message

race.cpp: In function 'int main()':
race.cpp:49:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
race.cpp:54:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &x);
             ~~~~~^~~~~~~~~~
# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 4344 KB Output is correct
2 Correct 9 ms 6264 KB Output is correct
3 Correct 10 ms 6396 KB Output is correct
4 Correct 13 ms 6392 KB Output is correct
5 Correct 6 ms 4472 KB Output is correct
6 Correct 19 ms 6364 KB Output is correct
7 Correct 8 ms 4472 KB Output is correct
8 Correct 28 ms 6392 KB Output is correct
9 Correct 9 ms 4472 KB Output is correct
10 Correct 16 ms 4472 KB Output is correct
11 Correct 11 ms 4472 KB Output is correct
12 Incorrect 104 ms 6784 KB Output isn't correct
13 Incorrect 43 ms 7032 KB Output isn't correct
14 Correct 58 ms 5240 KB Output is correct
15 Incorrect 783 ms 7672 KB Output isn't correct
16 Incorrect 1202 ms 7672 KB Output isn't correct
17 Incorrect 377 ms 7672 KB Output isn't correct
18 Correct 73 ms 5500 KB Output is correct
19 Incorrect 471 ms 7516 KB Output isn't correct
20 Incorrect 355 ms 7560 KB Output isn't correct