Submission #63495

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
63495	2018-08-02 02:39:43	win11905	Xylophone (JOI18_xylophone)	C++11	100 / 100	172 ms	832 KiB

xylophone

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#include "xylophone.h"
#include <bits/stdc++.h>
using namespace std;
int n, A[5005];
int getl() {
  int l = 1, r = n;
  while(l < r) {
    int m = l + r + 1>> 1;
    if(query(m, n) == n-1) l = m;
    r = m-1; 
  }
  return l;
}
int getNum(int a1, int a2, int a, int b) {
  if(a > b) {
    if(a2 - a1 == a - b) return a + a1;
    return a - a1;
  } else {
    if(a2 - a1 == b - a) return a - a1;
    return a + a1;
  }
}
void solve(int N) {
  n = N;
  A[1] = 0, A[2] = query(1, 2);
  for(int i = 3; i <= n; ++i) A[i] = getNum(query(i-1, i), query(i-2, i), A[i-1], A[i-2]);
 
 
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Compilation message (stderr)

xylophone.cpp: In function 'int getl()':
xylophone.cpp:10:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = l + r + 1>> 1;
           ~~~~~~^~~
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:38:2: warning: 'p1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(p1 > pn) for_each(A+1, A+n+1, [&](int &x) { x = n - x + 1; });
  ^~
xylophone.cpp:38:2: warning: 'pn' may be used uninitialized in this function [-Wmaybe-uninitialized]

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