Submission #1003389

#TimeUsernameProblemLanguageResultExecution timeMemory
1003389vjudge1Rice Hub (IOI11_ricehub)C++17
100 / 100
9 ms2652 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long #define f first #define s second #define pf push_front #define pb push_back #define pi pair<int,int> #define vi vector<int> /* int besthub(int n, int last, int x[], ll b){ int ans = 0; int l , r; for(int i = 0; i < n; i++){ l = i - (lower_bound(x.begin(), x.end(), max(0LL,x[i]-b))- x.begin()); r = upper_bound(x.begin(), x.end(), min((ll) last, x[i]+b)) - x.begin() - (i+1); // cout << x[i] << " " <<l << " " << r << endl; ans = max(l+r+1,ans); } return ans; } */ int besthub(int n, int last, int x[], ll b){ ll ans = 0; ll cnt; ll pref[n+1]; pref[0] = 0; for(int i = 1; i <= n; i++){ pref[i] = pref[i-1]+x[i-1]; } if(b>=pref[n]){ return n; } ll l = 1; ll final = 1; for(ll r =1; r <= n;r++){ ll m = (l+r)/2; if(final==n) return n; // ll val = pref[r] - pref[m] + (pref[m]-pref[max(0,l)]); ll val= ((x[m-1]*(m-l)) - (pref[m-1]-pref[l-1]) + ((pref[r]-pref[m]) - (x[m-1]*(r-m)))); //cout <<l << " "<< r << " " << val<<endl; // cout << val << endl; if( ((x[m-1]*(m-l)) - (pref[m-1]-pref[l-1]) + ((pref[r]-pref[m]) - (x[m-1]*(r-m))))<= b){ // cout << l << " " << r << endl; final = max(final,r-l+1); } else{ while(((x[m-1]*(m-l)) - (pref[m-1]-pref[l-1]) + ((pref[r]-pref[m]) - (x[m-1]*(r-m)))) > b && l<r){ m = (l+r)/2; l++; } m = (l+r)/2; } } return final; }

Compilation message (stderr)

ricehub.cpp: In function 'int besthub(int, int, int*, long long int)':
ricehub.cpp:59:11: warning: unused variable 'val' [-Wunused-variable]
   59 |        ll val= ((x[m-1]*(m-l)) - (pref[m-1]-pref[l-1]) + ((pref[r]-pref[m]) - (x[m-1]*(r-m))));
      |           ^~~
ricehub.cpp:34:8: warning: unused variable 'ans' [-Wunused-variable]
   34 |     ll ans = 0;
      |        ^~~
ricehub.cpp:36:8: warning: unused variable 'cnt' [-Wunused-variable]
   36 |     ll cnt;
      |        ^~~
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