Submission #719114

#	Time	Username	Problem	Language	Result	Execution time	Memory
719114		fdnfksd	Divide and conquer (IZhO14_divide)	C++14	100 / 100	45 ms	8048 KiB

divide

#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e5;
const ll inf=1e18;
const ll mod=1e9+7;
ll ans=-inf;
ll n,x[maxN],g[maxN],d[maxN],pre[maxN],pre2[maxN],mn[maxN];
void solve()
{
    cin >> n;
    for(int i=1;i<=n;i++) cin >> x[i] >> g[i] >> d[i],pre[i]=pre[i-1]+d[i],pre2[i]=pre2[i-1]+g[i];
    for(int i=1;i<=n;i++)
    {
        ll sum=g[i],re=d[i];
        ans=max(ans,sum);
    }
    mn[n+1]=-inf;
    for(int i=n;i>=1;i--)
    {
        mn[i]=max(mn[i+1],pre[i]-x[i]);
    }
    for(int i=1;i<n;i++)
    {
        ll low=i+1,high=n;
        while(low<=high)
        {
            ll mid=low+high>>1;
            if(mn[mid]>=pre[i-1]-x[i]) low=mid+1;
            else high=mid-1;
        }
        ans=max(ans,pre2[high]-pre2[i-1]);
    }
    cout << ans;
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

Compilation message (stderr)

divide.cpp: In function 'void solve()':
divide.cpp:21:21: warning: unused variable 're' [-Wunused-variable]
   21 |         ll sum=g[i],re=d[i];
      |                     ^~
divide.cpp:34:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |             ll mid=low+high>>1;
      |                    ~~~^~~~~

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52