Submission #76372

#	Time	Username	Problem	Language	Result	Execution time	Memory
76372		MiricaMatei	Secret (JOI14_secret)	C++14	0 / 100	840 ms	9452 KiB

secret

#include "secret.h"

int v[1005][1005];

void solve(int l, int r) {
  if (l >= r)
    return ;
  int med = (l + r) / 2;
  solve(l, med);
  solve(med + 1, r);
  for (int i = med - 1; i >= 1; --i)
    v[i][med] = Secret(v[i][i], v[i + 1][med]);
  for (int i = med + 2; i <= r; ++i)
    v[i][med] = Secret(v[i][i], v[med + 1][i - 1]);
}

void Init(int N, int A[]) {
  for (int i = 0; i < N; ++i)
    for (int j = 0; j < N; ++j)
      v[i][j] = -1;
  for (int i = 0; i < N; ++i)
    v[i][i] = 1;
  solve(0, N - 1);
}

int Query(int L, int R) {
  if (L == R)
    return v[L][L];
  if (R == L + 1)
    return Secret(v[L][L], v[R][R]);
  for (int k = L; k < R; ++k)
    if (v[L][k] != -1 && v[k + 1][R] != -1)
      return Secret(v[L][k], v[k + 1][R]);
  return 0;
}

• Subtask 1: 0 / 100