Submission #85402

#	Time	Username	Problem	Language	Result	Execution time	Memory
85402		nikolapesic2802	Sparklers (JOI17_sparklers)	C++14	0 / 100	2 ms	628 KiB

sparklers

#include <bits/stdc++.h>

#define ll long long
#define pb push_back
#define sz(x) (int)(x).size()
#define mp make_pair
#define f first
#define s second
#define all(x) x.begin(), x.end()

using namespace std;

int main()
{
    int n,k,t;
    scanf("%i %i %i",&n,&k,&t);
    vector<int> arr(n+1);
    for(int i=1;i<=n;i++)
    {
        scanf("%i",&arr[i]);
    }
    int le=0,ri=1e9;
    while(le<ri)
    {
        int m=(le+ri)>>1;
        vector<long double> X(n+1);
        for(int i=1;i<=n;i++)
        {
            X[i]=arr[i]-(long double)2*m*t*(i-1);
        }
        int l=k,r=k;
        int minn=k,maxx=k;
        int ok=1;
        while(ok)
        {
            ok=0;
            while(l>1&&X[l-1]>=X[minn])
            {
                ok=1;
                if(X[--l]>X[maxx])maxx=l;
            }
            while(r<n&&X[r+1]<=X[maxx])
            {
                ok=1;
                if(X[++r]<X[minn])minn=r;
            }
        }
        if(l==1&&r==n)
        {
            ri=m;
        }
        else
        {
            le=m+1;
        }
    }
    printf("%i\n",le);
    return 0;
}

Compilation message (stderr)

sparklers.cpp: In function 'int main()':
sparklers.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i %i %i",&n,&k,&t);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%i",&arr[i]);
         ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 20
• Subtask 3: 0 / 50