Submission #477357

#	Time	Username	Problem	Language	Result	Execution time	Memory
477357		nicolaalexandra	Xylophone (JOI18_xylophone)	C++14	47 / 100	86 ms	344 KiB

xylophone

#include <bits/stdc++.h>
#include "xylophone.h"
#define DIM 5010
using namespace std;

int v[DIM],a[DIM];
int n,i;
/*
void answer (int i, int val){
    cout<<i<<" "<<val<<"\n";
}

int query (int x, int y){
    int maxi = 0, mini = n+1;
    for (int i=x;i<=y;i++){
        mini = min (mini,a[i]);
        maxi = max (maxi,a[i]);
    }
    return maxi - mini;
}
*/


void divide (int st, int dr, int val, int tip, int capat){
    if (st > dr)
        return;

    if (!tip){ /// am un mini, deci determin un maxi

        int maxi,l,r,poz;

        if (capat){
            int dif = query (st,dr+1);
            maxi = val + dif;

            l = st, r = dr, poz = 0;
            while (l <= r){
                int mid = (l+r)>>1;
                if (query (mid,dr+1) == dif){
                    poz = mid;
                    l = mid+1;
                } else r = mid-1;
            }


        } else {
            int dif = query (st-1,dr);
            maxi = val + dif;

            l = st, r = dr, poz = 0;
            while (l <= r){
                int mid = (l+r)>>1;
                if (query (st-1,mid) == dif){
                    poz = mid;
                    r = mid-1;
                } else l = mid+1;
            }
        }

        v[poz] = maxi;
        divide (st,poz-1,maxi,1,1);
        divide (poz+1,dr,maxi,1,0);

    } else {

        int mini,l,r,poz;

        if (capat){
            int dif = query (st,dr+1);
            mini = val - dif;

            l = st, r = dr;
            while (l <= r){
                int mid = (l+r)>>1;
                if (query(mid,dr+1) == dif){
                    l = mid+1;
                    poz = mid;
                } else r = mid-1;
            }


        } else {

            int dif = query (st-1,dr);
            mini = val - dif;

            l = st, r = dr;
            while (l <= r){
                int mid = (l+r)>>1;
                if (query(st-1,mid) == dif){
                    r = mid-1;
                    poz = mid;
                } else l = mid+1;
            }

        }

        v[poz] = mini;
        divide (st,poz-1,mini,0,1);
        divide (poz+1,dr,mini,0,0);

    }

}

void solve (int n){

    /// determin pozitia lui n
    int st = 1, dr = n, sol_poz;
    while (st <= dr){
        int mid = (st+dr)>>1;
        if (query(1,mid) == n-1){
            sol_poz = mid;
            dr = mid-1;
        } else st = mid+1;
    }

    v[sol_poz] = n;

    divide (1,sol_poz-1,n,1,1);
    divide (sol_poz+1,n,n,1,0);

    for (int i=1;i<=n;i++)
        answer (i,v[i]);

}

/*
int main (){


    ifstream cin ("date.in");
    ofstream cout ("date.out");

    cin>>n;
    for (i=1;i<=n;i++)
        cin>>a[i];

    solve (n);

    return 0;
}
*/

Compilation message (stderr)

xylophone.cpp: In function 'void divide(int, int, int, int, int)':
xylophone.cpp:100:16: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized]
  100 |         divide (poz+1,dr,mini,0,0);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:118:16: warning: 'sol_poz' may be used uninitialized in this function [-Wmaybe-uninitialized]
  118 |     v[sol_poz] = n;
      |     ~~~~~~~~~~~^~~

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