Submission #992951

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Source Code Expand

#include <bits/stdc++.h>
  
#define FOR(i,a,b) for( ll i = (a); i < (ll)(b); i++ )
#define REP(i,n) FOR(i,0,n)
#define YYS(x,arr) for(auto& x:arr)
#define ALL(x) (x).begin(),(x).end()
#define SORT(x) sort( (x).begin(),(x).end() )
#define REVERSE(x) reverse( (x).begin(),(x).end() )
#define UNIQUE(x) (x).erase( unique( ALL( (x) ) ) , (x).end() )
#define PW(x) (1LL<<(x))
#define SZ(x) ((ll)(x).size())
#define SHOW(x) cout << #x << " = " << x << endl
 
#define pb emplace_back
#define fi first
#define se second

using namespace std;
 
typedef long double ld;
typedef long long int ll;
typedef pair<int,int> pi;
typedef pair<ll,ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<bool> vb;
typedef vector<ld> vd;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<vpl> gr;
typedef vector<vl> ml;
typedef vector<vd> md;
typedef vector<vi> mi;
 
const ll INF = (ll)1e9 + 10;
const ll INFLL = (ll)1e18 + 10;
const ld EPS = 1e-8;
const ll MOD = 1e9+7;

template<class T> T &chmin( T &a , const T &b ){ return a = min(a,b); }
template<class T> T &chmax( T &a , const T &b ){ return a = max(a,b); }
template<class T> inline T sq( T a ){ return a * a; }
ll in(){ ll x; scanf( "%lld" , &x ); return x; }
 
// head

ll dp[4000010];

ll n, a;
ll ans;

ll f( ll x , ll y ){
  return dp[x] * ( y - x - a );
}

ll calc( ll x ){
  ll lb = 1, ub = x-a;
  while( ub - lb > 4 ){
    ll md1 = ( lb * 2 + ub ) / 3;
    ll md2 = ( lb + ub * 2 ) / 3;
    if( f( md1 , x ) > f( md2 , x ) ){
      ub = md2;
    } else {
      lb = md1;
    }
  }
  ll res = -INFLL;
  FOR( i , lb , ub+1 ){
    chmax( res , f( i , x ) );
  }
  return res;
}

int main(){

  n = in();
  a = in();

  FOR( i , 1 , 4000010 ){
    dp[i] = i;
    chmax( dp[i] , calc( i ) );
    // cout << i << " " << dp[i] << endl;
    if( dp[i] >= n ){
      cout << i << endl;
      return 0;
    }
  }

  cout << n << endl;

  // assert( false );

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘ll in()’:
./Main.cpp:43:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 ll in(){ ll x; scanf( "%lld" , &x ); return x; }
                                    ^

Judge Result