Submission #1150689

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1150689	2025-02-15 11:13:40	mingga	Xylophone (JOI18_xylophone)	C++20	Compilation error	0 ms	0 KiB

xylophone

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#include "xylophone.h"
static int a[5005];
void solve(int n) {
  a[1] = 0;
  a[2] = query(1, 2);
  int mxid = 2, mnid = 1;
  for(int i = 3; i <= n; i++) {
    int x1 = a[i - 1] - a[i - 2];
    int x2 = query(i - 1, i);
    int x3 = query(i - 2, i);
    int sign = (x1 > 0 ? 1 : -1);
    if(x1 + x2 == x3) {
      a[i] = x1 + x2 * sign; 
    } else {
      a[i] = x1 - x2 * sign;
    }
    if(a[i] > a[mxid]) mxid = i;
    if(a[i] < a[mnid]) mnid = i;
  }
  if(mxid < mnid) {
    for(int i = 1; i <= n; i++) a[i] = -a[i];
    swap(mnid, mxid);
  }
  int ext = 1 - a[mnid];
  for(int i = 1; i <= n; i++) {
    answer(i, a[i] + ext);
  }
}
 
 
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Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:24:17: error: 'swap' was not declared in this scope
   24 |                 swap(mnid, mxid);
      |                 ^~~~