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Submission #260163

# Submission time Handle Problem Language Result Execution time Memory
260163 2020-08-09T12:25:55 Z MiricaMatei Sailing Race (CEOI12_race) C++14
100 / 100
 2048 ms 10364 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 505;

int n;
int dp1[MAXN][MAXN][3];
int dp2[MAXN][MAXN][3];
int mc[MAXN][MAXN];
int first[MAXN][MAXN][3];

int prv(int i) {
  i--;
  if (i == 0)
    i = n;
  return i;
}

int nxt(int i) {
  i++;
  if (i == n + 1)
    i = 1;
  return i;
}

int solve1(int x, int y, int t) {
  if (dp1[x][y][t] != -1)
    return dp1[x][y][t];
  if (t == 0) {
    int mx = 0;
    for (int i = y; i != x; i = prv(i))
      if (mc[y][i])
        mx = max(mx, 1 + max(solve1(x, i, 0), solve1(y, i, 1)));
    dp1[x][y][t] = mx;
  } else {
    int mx = 0;
    for (int i = y; i != x; i = nxt(i))
      if (mc[y][i])
        mx = max(mx, 1 + max(solve1(y, i, 0), solve1(x, i, 1)));
    dp1[x][y][t] = mx;
  }
  return dp1[x][y][t];
}

bool in(int i, int k, int l, int t) {
  if (t == 0) {
    if (k > l) {
      if (k > i && i > l)
        return 1;
      return 0;
    } else {
      if (l > i && i > k)
        return 0;
      return 1;
    }
  } else {
    if (k > l) {
      if (k > i && i > l)
        return 0;
      return 1;
    } else {
      if (l > i && i > k)
        return 1;
      return 0;
    }
  }
}

int main() {
  //freopen("date.in", "r", stdin);
  //freopen("date.out", "w", stdout);

  int p;
  scanf("%d%d", &n, &p);
  for (int i = 1; i <= n; ++i) {
    int x;
    scanf("%d", &x);
    while (x != 0) {
      mc[i][x] = 1;
      scanf("%d", &x);
    }
    for (int j = 1; j <= n; ++j)
      for (int t = 0; t <= 1; ++t)
        dp1[i][j][t] = dp2[i][j][t] = -1;
  }

  for (int i = 1; i <= n; ++i)
    for (int j = 1; j <= n; ++j) {
      dp1[i][j][0] = solve1(i, j, 0);
      dp1[i][j][1] = solve1(i, j, 1);
    }
  for (int i = 1; i <= n; ++i)
    for (int j = 1; j <= n; ++j) {
      for (int t = 0; t <= 1; ++t) {
        if (mc[i][j]) {
          dp1[i][j][t] = max(dp1[i][j][t], 0);
          dp1[i][j][t]++;
        }
      }
    }

  int ans = 0, w = 0;
  for (int i = 1; i <= n; ++i)
    for (int j = 1; j <= n; ++j)
      for (int t = 0; t <= 1; ++t)
        if (mc[i][j] && dp1[i][j][t] > ans) {
          ans = dp1[i][j][t];
          w = i;
        }

  if (p == 1) {
    for (int j = 1; j <= n; ++j) {
      for (int k = prv(j); k != j; k = prv(k)) {
        for (int i = prv(k); i != j; i = prv(i)) {
          if (mc[i][j]) {
            first[j][k][0] = i;
            break;
          }
        }
      }
      for (int k = nxt(j); k != j; k = nxt(k)) {
        for (int i = nxt(k); i != j; i = nxt(i)) {
          if (mc[i][j]) {
            first[j][k][1] = i;
            break;
          }
        }
      }
    }
    for (int i = 1; i <= n; ++i) {
      for (int j = nxt(i); j != i; j = nxt(j)) {
        if (mc[j][i])
          dp2[j][i][0] = 1;
        for (int k = prv(j); k != i; k = prv(k))
          if (mc[j][k])
            dp2[j][i][0] = max(dp2[j][i][0], dp2[k][i][0] + 1);
      }
      for (int j = prv(i); j != i; j = prv(j)) {
        if (mc[j][i])
          dp2[j][i][1] = 1;
        for (int k = nxt(j); k != i; k = nxt(k))
          if (mc[j][k])
            dp2[j][i][1] = max(dp2[j][i][1], dp2[k][i][1] + 1);
      }
    }
    for (int j = 1; j <= n; ++j) {
      for (int k = prv(j); k != j; k = prv(k)) {
        for (int l = nxt(j); l != j; l = nxt(l)) {
          if (mc[k][l]) {
            int i = first[j][k][0];
            if (i == 0 || in(i, k, l, 0) == in(j, k, l, 0))
              continue;
            int sol = 1 + dp2[j][k][0] + 1 + max(dp1[j][l][0] - mc[j][l], dp1[i][l][1] - mc[i][l]);
            if (sol > ans) {
              ans = sol;
              w = i;
            }
          }
        }
      }
      for (int k = nxt(j); k != j; k = nxt(k)) {
        for (int l = prv(j); l != j; l = prv(l)) {
          if (mc[k][l]) {
            int i = first[j][k][1];
            if (i == 0 || in(i, k, l, 1) == in(j, k, l, 1))
              continue;
            int sol = 1 + dp2[j][k][1] + 1 + max(dp1[j][l][1] - mc[j][l], dp1[i][l][0] - mc[i][l]);
            if (sol > ans) {
              ans = sol;
              w = i;
            }
          }
        }
      }
    }

  }

  printf("%d\n%d\n", ans, w);

  return 0;
}

Compilation message

race.cpp: In function 'int main()':
race.cpp:75:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &n, &p);
   ~~~~~^~~~~~~~~~~~~~~~
race.cpp:78:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &x);
     ~~~~~^~~~~~~~~~
race.cpp:81:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &x);
       ~~~~~^~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 640 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 2 ms 896 KB Output is correct
5 Correct 2 ms 896 KB Output is correct
6 Correct 6 ms 1280 KB Output is correct
7 Correct 4 ms 1152 KB Output is correct
8 Correct 9 ms 1664 KB Output is correct
9 Correct 7 ms 1408 KB Output is correct
10 Correct 9 ms 1536 KB Output is correct
11 Correct 11 ms 1536 KB Output is correct
12 Correct 125 ms 4344 KB Output is correct
13 Correct 305 ms 6392 KB Output is correct
14 Correct 173 ms 6008 KB Output is correct
15 Correct 1692 ms 10236 KB Output is correct
16 Correct 1822 ms 10360 KB Output is correct
17 Correct 1553 ms 10364 KB Output is correct
18 Correct 288 ms 7304 KB Output is correct
19 Correct 2043 ms 10360 KB Output is correct
20 Correct 2048 ms 10360 KB Output is correct