Submission #780989

#	Time	Username	Problem	Language	Result	Execution time	Memory
780989		Mouad_ouj	Radio Towers (IOI22_towers)	C++17	Compilation error	0 ms	0 KiB

towers

//#include "towers.h" //sub1
#include <bits/stdc++.h>
using namespace std;
vector<int> he;
int k=-1;
void init (int n,vector<int> h)
{
    he.resize(n);
    for(int x=0;x<n;x++)
    {
    he[x]=h[x];
    if(h[x]>h[x+1] && x!=n && k==-1)
    k=x;
    }
    if(h[n-1]>h[n-2])
    k=n-1;
}
int max_towers(int l, int r, int d)
{
    //if(l==r)
    //return 1;
    if(he[n-1]>he[k]-d || he[0]>he[k]-d)
    return 0;
    int ml=k,mr=n-1;
    while(ml!=mr)
    {
        int mid=(ml+mr)/2;
        if(he[mid]>he[k]-d)
        ml=mid+1;
        else
        mr=mid;
    }
    int a1=mr,a2=0;
    ml=0,mr=k;
    while(ml!=mr)
    {
        int mid=(ml+mr)/2;
        if(he[mid]<he[k]-d)
        ml=mid+1;
        else
        mr=mid;
    }
    a2=mr;
    a2=max(a2,l);
    a1=min(a1,r);
    return ((r-a1+1)+(a2-l));
}

Compilation message (stderr)

towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:22:11: error: 'n' was not declared in this scope
   22 |     if(he[n-1]>he[k]-d || he[0]>he[k]-d)
      |           ^
towers.cpp:24:17: error: 'n' was not declared in this scope
   24 |     int ml=k,mr=n-1;
      |                 ^