Submission #230945

#	Time	Username	Problem	Language	Result	Execution time	Memory
230945		AlexLuchianov	Xylophone (JOI18_xylophone)	C++14	100 / 100	115 ms	632 KiB

xylophone

#include "xylophone.h"
#include <iostream>

int const nmax = 5000;
static int A[5000];

int diff[1 + nmax];
int change[1 + nmax];
int v[1 + nmax];

void solve(int n) {
  for(int i = 1;i < n; i++)
    diff[i] = query(i, i + 1);
  change[1] = 1;
  for(int i = 2; i < n; i++){
    if(diff[i - 1] + diff[i] == query(i - 1, i + 1))
      change[i] = change[i - 1];
    else
      change[i] = !change[i - 1];
  }
  v[1] = 0;
  for(int i = 2;i <= n; i++)
    if(change[i - 1] == 1)
      v[i] = v[i - 1] + diff[i - 1];
    else
      v[i] = v[i - 1] - diff[i - 1];
  int smin = 0;
  for(int i = 1; i <= n; i++)
    smin = std::min(smin, v[i]);
  for(int i = 1;i <= n; i++)
    v[i] = v[i] - smin + 1;
  int pos1, posn;
  for(int i = 1;i <= n; i++)
    if(v[i] == 1)
      pos1 = i;
    else if(v[i] == n)
      posn = i;
  if(posn < pos1)
    for(int i = 1; i <= n; i++)
      v[i] = n - v[i] + 1;


  for(int i = 1;i <= n; i++)
    answer(i, v[i]);
}
/*
5
2 1 5 3 4
*/

Compilation message (stderr)

xylophone.cpp:5:12: warning: 'A' defined but not used [-Wunused-variable]
 static int A[5000];
            ^
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:38:3: warning: 'posn' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(posn < pos1)
   ^~
xylophone.cpp:38:3: warning: 'pos1' may be used uninitialized in this function [-Wmaybe-uninitialized]

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