Submission #412483

#	Time	Username	Problem	Language	Result	Execution time	Memory
412483		songc	Secret (JOI14_secret)	C++14	100 / 100	526 ms	4416 KiB

secret

#include "secret.h"

int N;
int A[1010], T[20][1010];

void dnc(int d, int s, int e){
	if (s == e) return;
	int m=s+e>>1;
	T[d][m+1] = A[m+1];
	for (int i=m+2; i<=e; i++) T[d][i] = Secret(T[d][i-1], A[i]);
	T[d][m] = A[m];
	for (int i=m-1; i>=s; i--) T[d][i] = Secret(A[i], T[d][i+1]);
	dnc(d+1, s, m), dnc(d+1, m+1, e);
}

void Init(int _N, int P[]){
	N = _N;
	for (int i=0; i<N; i++) A[i] = P[i];
	dnc(0, 0, N-1);
}

int qry(int d, int s, int e, int ts, int te){
	int m=s+e>>1;
	if (ts <= m && m < te) return Secret(T[d][ts], T[d][te]);
	if (te <= m) return qry(d+1, s, m, ts, te);
	return qry(d+1, m+1, e, ts, te);
}

int Query(int L, int R){
	if (L == R) return A[L];
	return qry(0, 0, N-1, L, R);
}

Compilation message (stderr)

secret.cpp: In function 'void dnc(int, int, int)':
secret.cpp:8:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    8 |  int m=s+e>>1;
      |        ~^~
secret.cpp: In function 'int qry(int, int, int, int, int)':
secret.cpp:23:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |  int m=s+e>>1;
      |        ~^~

• Subtask 1: 100 / 100