Submission #128286

#	Time	Username	Problem	Language	Result	Execution time	Memory
128286		miguel	Xylophone (JOI18_xylophone)	C++14	0 / 100	2 ms	324 KiB

xylophone

#include<bits/stdc++.h>
#include <xylophone.h>
using namespace std;
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define dbg(x) cout << #x << '=' << x << '\n';
#define ll long long
#define sz size()
#define x first
#define y second
#define pi pair <int, int>
#define pii pair <int, pi>
#define vi vector <int>
const ll mod = 1e9 + 7;
int n, a[5001];

void solve(int n){
    int t[5001], q[5003];
    for(int i=1; i<=n; i++) q[i]=query(i, i+1);
    int l=1, r=n;
    while(r-l>1){
        int mid=(l+r)/2;
        if(query(1, mid)!=n-1) l=mid;
        else r=mid;
    }
    int mx=r;
    l=1, r=mx;
    while(r-l>1){
        int mid=(l+r)/2;
        if(query(mid, mx)!=n-1) r=mid;
        else l=mid;
    }
    int mn=l;
    t[mn]=1, t[mx]=n;
    if(mn>1) t[mn-1]=query(mn-1, mn)+1;
    t[mn+1]=query(mn, mn+1)+1;
    if(mx<n) t[mx+1]=n-query(mx, mx+1);
    t[mx-1]=n-query(mx-1, mx);
    for(int i=mn-1; i>=2; i--){
        int q1=query(i-1, i+1), q2=q[i-1], q3=q[i];
        if(q[i-1]==-1)
        if(q1==q2+q3){

            if(t[i+1]>t[i]) t[i-1]=t[i]-q2;
            else t[i-1]=t[i]+q2;
        }
        else{
            if(t[i+1]>t[i]) t[i-1]=t[i]+q2;
            else t[i-1]=t[i]-q2;
        }
    }
    for(int i=mn+1; i<=mx-2; i++){
        int q1=query(i-1, i+1), q2=q[i-1], q3=q[i];
        if(q1==q2+q3){//cout<<i<<"mamamia"<<endl;
            if(t[i-1]>t[i]) t[i+1]=t[i]-q3;
            else t[i+1]=t[i]+q3;
        }
        else{
            if(t[i-1]>t[i]) t[i+1]=t[i]+q3;
            else t[i+1]=t[i]-q3;
        }
    }
    for(int i=mx+1; i<=n-1; i++){
        int q1=query(i-1, i+1), q2=q[i-1], q3=q[i];
        if(q1==q2+q3){
            if(t[i-1]>t[i]) t[i+1]=t[i]-q3;
            else t[i+1]=t[i]+q3;
        }
        else{
            if(t[i-1]>t[i]) t[i+1]=t[i]+q3;
            else t[i+1]=t[i]-q3;
        }
    }
    //for(int i=1; i<=n; i++) cout<<t[i]<<"x ";
    for(int i=1; i<=n; i++) answer(i, t[i]);
    //cout<<mn<<" "<<mx<<endl;
}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:41:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
         if(q[i-1]==-1)
           ^

• Subtask 1: 0 / 11
• Subtask 2: 0 / 36
• Subtask 3: 0 / 53