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Submission #261555

# Submission time Handle Problem Language Result Execution time Memory
261555 2020-08-11T21:09:19 Z tincamatei Sailing Race (CEOI12_race) C++14
40 / 100
 1074 ms 2680 KB 
#include <bits/stdc++.h>

const int MAX_N = 500;

bool graph[MAX_N][MAX_N];
int asc[MAX_N][MAX_N], desc[MAX_N][MAX_N];

int main() {
  int N, K;

  scanf("%d%d", &N, &K);

  for(int i = 0; i < N; ++i) {
    int t;
    scanf("%d", &t);
    while(t != 0) {
      graph[i][t - 1] = true;
      scanf("%d", &t);
    }
  }

  for(int len = 2; len <= N; ++len) {
    for(int i = 0; i < N; ++i) {
      int j = (i + len - 1) % N, k = i;
      
      do {
        k = (k + 1) % N;
        if(graph[i][k])
          asc[i][j] = std::max(asc[i][j], 1 + std::max(asc[k][j], desc[k][(i + 1) % N]));
      } while(k != j);

      j = (i + N - len + 1) % N;
      k = i;

      do {
        k = (k + N - 1) % N;
        if(graph[i][k])
          desc[i][j] = std::max(desc[i][j], 1 + std::max(desc[k][j], asc[k][(i - 1 + N) % N]));
      } while(k != j);
    }
  }

  int best_len = 0, start_path = 0;

  for(int i = 0; i < N; ++i) {
    int ii = ((i + N - 1) % N);

    if(asc[i][ii] > best_len) {
      best_len = asc[i][ii];
      start_path = i;
    }

    ii = (i + 1) % N;
    if(desc[i][ii] > best_len) {
      best_len = desc[i][ii];
      start_path = i;
    }
  }

  printf("%d\n%d", best_len, start_path + 1);

  return 0;
}

Compilation message

race.cpp: In function 'int main()':
race.cpp:11:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &N, &K);
   ~~~~~^~~~~~~~~~~~~~~~
race.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &t);
     ~~~~~^~~~~~~~~~
race.cpp:18:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &t);
       ~~~~~^~~~~~~~~~

Subtask #1
40.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Incorrect 1 ms 384 KB Output isn't correct
3 Incorrect 1 ms 384 KB Output isn't correct
4 Incorrect 1 ms 512 KB Output isn't correct
5 Correct 2 ms 512 KB Output is correct
6 Incorrect 3 ms 640 KB Output isn't correct
7 Correct 5 ms 640 KB Output is correct
8 Incorrect 5 ms 640 KB Output isn't correct
9 Correct 9 ms 768 KB Output is correct
10 Correct 12 ms 768 KB Output is correct
11 Correct 13 ms 768 KB Output is correct
12 Incorrect 66 ms 1152 KB Output isn't correct
13 Incorrect 188 ms 1724 KB Output isn't correct
14 Correct 419 ms 2168 KB Output is correct
15 Incorrect 926 ms 2680 KB Output isn't correct
16 Incorrect 988 ms 2560 KB Output isn't correct
17 Incorrect 940 ms 2680 KB Output isn't correct
18 Correct 774 ms 2560 KB Output is correct
19 Incorrect 1048 ms 2560 KB Output isn't correct
20 Incorrect 1074 ms 2680 KB Output isn't correct