Submission #259054

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
259054	2020-08-07 05:30:28	ChrisT	Boat (APIO16_boat)	C++17	100 / 100	1133 ms	11512 KiB

boat

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
const int MN = 505, LOG = 18, MOD = 1e9 + 7;
int dp[MN][MN<<1],pre[MN<<1][MN][2],a[MN],b[MN];
int ch[MN][MN], ch2[MN<<1][MN][2], iv[MN<<1];
int inv (int base) {
  int res = 1, exp = MOD - 2;
  while (exp) {
    if (exp&1) res = (ll)res * base % MOD;
    base = (ll)base * base % MOD;
    exp>>=1;
  }
  return res;
}
int choose (int n, int k) {
  assert(n >= 0 && k >= 0);
  int res = 1;
  for (int i = n; i > n-k; i--) res = (ll)res * i % MOD;
  for (int i = 2; i <= k; i++) res = (ll)res * iv[i] % MOD;
  return res;
}
int calc (int j, int x, bool ree) {
  int ret = ch2[j][x-ree][ree];
  for (int zeros = 1; zeros <= x-2; zeros++) ret = (ret + (ll)ch2[j][x-zeros-ree][ree] * ch[x-2][zeros]) % MOD;
  return ret;
}
int main () {
  int n;
 
 
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Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d",&n);
  ~~~~~~^~~~~~~~~
boat.cpp:36:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%d %d",&a[i],&b[i]);
   ~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 27 / 27
• Subtask 4: 42 / 42