Submission #384098

#	Time	Username	Problem	Language	Result	Execution time	Memory
384098		ritul_kr_singh	Secret (JOI14_secret)	C++17	100 / 100	510 ms	8428 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>
using namespace std;

int b[1000][1000], n;
vector<array<int, 2>> c;

void PreCalc(int lx, int rx){
	if(rx-lx<=2) return;
	int mx = (lx+rx)/2;
	PreCalc(lx, mx);
	PreCalc(mx, rx);

	c.push_back({lx, rx});
}

void Init(int N, int a[]){
	n = N;
	for(int i=0; i<1000; ++i)
		for(int j=0; j<1000; ++j)
			b[i][j] = i-j ? -1 : a[i];
	PreCalc(0, n);
	for(auto z : c){
		int lx = z[0], rx = z[1];
		int mx = (lx+rx)/2;

		for(int i=mx-2; i>=lx; --i)
			b[i][mx-1] = Secret(b[i][i], b[i+1][mx-1]);
		for(int i=mx+1; i<rx; ++i)
			b[mx][i] = Secret(b[mx][i-1], b[i][i]);
	}
}

int Calc(int l, int r, int lx, int rx){
	int mx = (lx+rx)/2;
	if(r<mx) return Calc(l, r, lx, mx);
	if(l>=mx) return Calc(l, r, mx, rx);
	return Secret(b[l][mx-1], b[mx][r]);
}

int Query(int L, int R){
	if(L==R) return b[L][L];
	if(L+1==R) return Secret(b[L][L], b[R][R]);
	return Calc(L, R, 0, n);
}

• Subtask 1: 100 / 100