Submission #1155277

#	Time	Username	Problem	Language	Result	Execution time	Memory
1155277		modwwe	Radio Towers (IOI22_towers)	C++20	56 / 100	4041 ms	9452 KiB

towers

//#include "gap.h"
//#include "mushrooms.h"
//#include "prize.h"
#include "towers.h"
#pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>
//#define int   long long
#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define modwwe  int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task2 "ftree"
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".ans","w",stdout)
#define pb push_back
#define mask(k) (1<<k)
#define checktime   cerr << (double)clock() / CLOCKS_PER_SEC * 1000  << " ms";
using namespace std;
#define getchar_unlocked getchar
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l,int r)
{
    return uniform_int_distribution<int>(l,r)(rd);
}
void phongbeo();
const int inf = 1e16;
const ll mod2 = 1e9+7;
const ll base=67;
int  n, m, s1, s2, s4, s3, sf, k, s5, s6, mx, s7, s8, s9, mx2, res, dem2 = 0, dem = 0, s33, dem3, dem4, mid, l2, r2, center;
int  i, s10, s12,k1,k2,k3,s11,lim,w,l,r ;
int kk;
int t;
int el = 19;/*
main()
{
    if(fopen(task2".inp","r"))
    {
        fin(task2);
        fou(task2);
    }
    if(fopen(task".inp","r"))
    {
        fin(task);
        fou(task);
    }
    ios_base::sync_with_stdio(0);
    cout.tie(0);
    cin.tie(0);
    /// cin>>s1;
//int t;cin>>t; while(t--)
    phongbeo();
    checktime
}*/
int a[100001];
int Left[100002];
int Right[100002];
int st[17][100002];
vector<int> h;
void init(int N,vector<int> h)
{
    n=N;
    for(int i=0; i<n; i++)
        a[i+1]=h[i];
}
int last=-1;
void build(int x)
{
    last=x;
    vector<int> v;
    for(int i=1; i<=n; i++)
        Left[i]=Right[i]=n+1;
    for(int i=n; i>=1; --i)
    {
        while(!v.empty()&&a[i]>a[v.back()])v.pop_back();
        l=0;
        r=v.size()-1;
        while(l<=r)
        {
            int mid=l+r>>1;
            if(a[v[mid]]-x>=a[i])
            {
                l=mid+1;
                Right[i]=v[mid];
            }
            else
            {
                r=mid-1;
            }
        }
        v.pb(i);
    }
    v.clear();
    for(int i=n; i>=1; --i)
    {
        while(!v.empty()&&a[i]<a[v.back()])v.pop_back();
        l=0;
        r=v.size()-1;
        while(l<=r)
        {
            int mid=l+r>>1;
            if(a[i]-x>=a[v[mid]])
            {
                l=mid+1;
                Left[i]=v[mid];
            }
            else
            {
                r=mid-1;
            }
        }
        v.pb(i);
    }
for(int i=n-1;i>=1;--i)
    Left[i]=min(Left[i],Left[i+1]),
    Right[i]=min(Right[i],Right[i+1]);
    for(int i=1; i<=n; i++)
    {
        if(Right[i]==n+1)
            st[0][i]=n+1;
        else
        {
            st[0][i]=Left[Right[i]];
        }
    }
    for(int i=n-1; i>=1; --i)
        st[0][i]=min(st[0][i],st[0][i+1]);
    for(int i=1; i<17; i++)
        for(int j=1; j<=n; j++){
        if(st[i-1][j]==n+1)st[i][j]=n+1;
        else st[i][j]=st[i-1][st[i-1][j]];
        }
}
int max_towers(int L,int R,int D)
{
    l=L;
    r=R;
    m=D;
    if(m!=last)build(m);
    l=L+1;
    r=R+1;
    s4=0;
    for(int i=16; i>=0; --i){
        if(st[i][l]<=r)
        {
            l=st[i][l];
            s4+=mask(i);
        }
        }
    return s4+1;
}/*
void phongbeo()
{
    cin>>n>>m;
    for(int i=0; i<n; i++)
    {
        cin>>s2;
        h.pb(s2);
    }
    init(n,h);
 cin>>l>>r>>k;
 cout<<max_towers(l,r,k);
}
*/

Compilation message (stderr)

towers.cpp:29:17: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+16' to '2147483647' [-Woverflow]
   29 | const int inf = 1e16;
      |                 ^~~~

• Subtask 1: 0 / 4
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 14 / 14
• Subtask 5: 0 / 17
• Subtask 6: 19 / 19
• Subtask 7: 0 / 23