Submission #1109478

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109478		imarn	Bigger segments (IZhO19_segments)	C++14	100 / 100	159 ms	16664 KiB

segments

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define plx pair<ll,int>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define vi vector<int>
#define vvi vector<vi>
#define pp pair<ll,int>
#define ub(x,i) upper_bound(all(x),i)-x.begin()
using namespace std;
const int mxn=5e5+5;
ll t[4*mxn]{0};
void build(int i,int l,int r){
    if(l==r)return void(t[i]=1e16);
    int m=(l+r)>>1;
    build(2*i,l,m);build(2*i+1,m+1,r);
    t[i]=min(t[2*i],t[2*i+1]);
}
void upd(int i,int l,int r,int idx,ll v){
    if(r<idx||l>idx)return;
    if(l==r)return void(t[i]=v);
    int m=(l+r)>>1;
    upd(2*i,l,m,idx,v);upd(2*i+1,m+1,r,idx,v);
    t[i]=min(t[2*i],t[2*i+1]);
}
int qr(int i,int l,int r,ll tt){
    if(l==r)return l;int m=(l+r)>>1;
    if(t[2*i+1]<=tt)return qr(2*i+1,m+1,r,tt);
    return qr(2*i,l,m,tt);
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n;cin>>n;build(1,0,n);
    ll a[n+1]={0};for(int i=1;i<=n;i++)cin>>a[i],a[i]+=a[i-1];
    ll dp[n+1]={0};dp[0]=0;upd(1,0,n,0,0);
    for(int i=1;i<=n;i++){
        int r=qr(1,0,n,a[i]);
        dp[i] = dp[r]+1;
        upd(1,0,n,i,2*a[i]-a[r]);
    }cout<<dp[n];
}

Compilation message (stderr)

segments.cpp: In function 'int qr(int, int, int, long long int)':
segments.cpp:31:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   31 |     if(l==r)return l;int m=(l+r)>>1;
      |     ^~
segments.cpp:31:22: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   31 |     if(l==r)return l;int m=(l+r)>>1;
      |                      ^~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27