Submission #76389

#	Time	Username	Problem	Language	Result	Execution time	Memory
76389		MiricaMatei	Secret (JOI14_secret)	C++14	100 / 100	623 ms	8548 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 >= l; --i)
    v[i][med] = Secret(v[i][i], v[i + 1][med]);
  for (int i = med + 2; i <= r; ++i)
    v[med + 1][i] = Secret(v[med + 1][i - 1], v[i][i]);
}

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] = A[i];
  solve(0, N - 1);
}

int Query(int L, int R) {
  if (v[L][R] != -1)
    return v[L][R];
  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]);
}

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:34:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 100 / 100