Submission #952175

#	Time	Username	Problem	Language	Result	Execution time	Memory
952175		nguyennh	Bigger segments (IZhO19_segments)	C++14	0 / 100	1 ms	464 KiB

segments

#include<bits/stdc++.h>
#define el '\n'
using namespace std ;

mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());

const int64_t inf = 1e18;

int32_t main (){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n + 5);
  for ( int i = 1 ; i <= n ; i++ ) cin >> a[i];
  vector<int64_t> pref(n + 5);
  for ( int i = 1 ; i <= n ; i++ ) pref[i] = pref[i - 1] + a[i];
  vector<vector<int64_t>> dp(n + 5 , vector<int64_t>(n + 5));
  for ( int i = 1 ; i <= n ; i++ ){
    for ( int j = i ; j >= 1 ; j-- ){
      int l = 0 , r = j , pos = -1;
      while (l <= r){
        int mid = l + r >> 1;
        if (pref[j - 1] - pref[mid - 1] <= pref[i] - pref[j - 1]){
          pos = mid;
          r = mid - 1;
        }
        else l = mid + 1;
      } 
      assert(pos != -1);
      for ( int k = pos ; k <= j - 1 ; k++ ) dp[i][j] = max(dp[i][j] , dp[j - 1][k] + 1);
    }
  }
  int64_t ans = 0;
  for ( int i = 1 ; i <= n ; i++ ){
    ans = max(ans , dp[n][i]);
  }
  cout << ans;
}

Compilation message (stderr)

segments.cpp: In function 'int32_t main()':
segments.cpp:23:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |         int mid = l + r >> 1;
      |                   ~~^~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27