Submission #345086

#	Time	Username	Problem	Language	Result	Execution time	Memory
345086		Kevin_Zhang_TW	Tropical Garden (IOI11_garden)	C++17	69 / 100	5088 ms	42792 KiB

garden

#pragma GCC optimize("Ofast")
#pragma GCC target("avx2", "sse4")
#include "garden.h"
#include "gardenlib.h"

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a ? (a = b, true) : false; }
template<class T> bool chmax(T &a, T b) { return a < b ? (a = b, true) : false; }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T L, T R) { while (L != R) cerr << *L << " \n"[next(L) == R], ++L; }
#else
#define DE(...) 0
#define debug(...) 0
#endif
const int MAX_N = 300010, MAX_K = 30;

int nxt[MAX_K][MAX_N], n;
int cur[MAX_N];
void count_routes(int N, int M, int P, int R[][2], int Q, int G[]) {
	{
		auto nxt0 = nxt[0];
		fill(nxt0, nxt0 + N * 2, -1);
		vector<vector<int>> edge(N);
		for (int i = 0;i < M;++i) {
			int a = R[i][0], b = R[i][1];
			edge[a].pb(b), edge[b].pb(a);
		}
		for (int i = 0;i < N;++i) {
			nxt0[i] = edge[i][0];
			if (i == edge[ nxt0[i] ][0]) nxt0[i] += N;
			nxt0[i + N] = nxt0[i];
			if (edge[i].size() > 1) {
				nxt0[i + N] = edge[i][1];
				if (i == edge[ nxt0[i + N] ][0]) nxt0[i + N] += N;
			}
		}
	}

	for (int d = 1;d < MAX_K;++d)
		for (int i = 0;i < N+N;++i)
			nxt[d][i] = nxt[d-1][ nxt[d-1][i] ];

	for (int i = 0;i < Q;++i) {
		iota(cur, cur+N+N, 0);
		for (int d = 0;d < MAX_K;++d) if (G[i]>>d&1)
			for (int j = 0;j < N+N;++j)
				cur[j] = nxt[d][cur[j]];

		int res = 0;
		for (int j = 0;j < N;++j)
			if (cur[j] == P || cur[j] == P + N)
				++res;
		answer(res);
	}
}

• Subtask 1: 49 / 49
• Subtask 2: 20 / 20
• Subtask 3: 0 / 31