제출 #291909

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
291909	2020-09-06 01:51:36	Diuven	서류 전달 (ROI16_sending)	C++11	48 / 100	5098 ms	7548 KiB

sending

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/**
 * Author: Sergey Kopeliovich ([e-mail])
 *
 * O(m^2logn + nlogn)
 * Насчитали за O(nlogn) двоичные подъёмы для LCA.
 * Для каждой пары путей ищем пересечение за O(1).
 */
#include <cassert>
#include <cstdio>
#include <algorithm>
using namespace std;
#define forn(i, n) for (int i = 0; i < (int)(n); i++)
#define fornd(i, n) for (int i = (int)(n) - 1; i >= 0; i--)
const int N = 1e5, K = 17;
int n, k, p[N][K], a[N], b[N], lca[N], dep[N];
void up( int &a, int k ) {
  fornd(i, K)
    if (k >= (1 << i))
      a = p[a][i], k -= 1 << i;
}
int getLcaDepth( int a, int b ) {
  up(a, dep[a] - dep[b]);
  up(b, dep[b] - dep[a]);
 
 
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컴파일 시 표준 에러 (stderr) 메시지

sending.cpp: In function 'int main()':
sending.cpp:39:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
sending.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   43 |   scanf("%d", &p[i][0]);
      |   ~~~~~^~~~~~~~~~~~~~~~
sending.cpp:52:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |   scanf("%d%d", &a[i], &b[i]), a[i]--, b[i]--;
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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