Submission #392549

#	Time	Username	Problem	Language	Result	Execution time	Memory
392549		JimmyZJX	Mechanical Doll (IOI18_doll)	C++14	47 / 100	214 ms	14144 KiB

doll

#include <iostream>
#include <fstream>
#include <algorithm>
#include <cstring>
#include <climits>
#include <cassert>
#include <tuple>
#include <queue>
#include <stack>
#include <vector>
#include <map>
#include <set>
#include <string>
#include <unordered_set>
#include <unordered_map>

using namespace std;

typedef long long LL;
typedef vector<int> Vi;
typedef vector<bool> Vb;
typedef vector<vector<int>> Vii;

#define forR(i, n) for (int i = 0; i < (n); i++)

void answer(Vi C, Vi X, Vi Y);

Vi C, X, Y;
Vi swState;

int getLevelSW(int sz) {
	int level = 1, maxSz = 2;
	while (sz > maxSz) {
		level++, maxSz *= 2;
	}
	return level;
}

int getSW(int root = 0) {
	int swNo = -1 - X.size();
	X.push_back(root); Y.push_back(root); swState.push_back(0);
	return swNo;
}

void setSWX(int sw, int t) {
	X[-1 - sw] = t;
}
void setSWY(int sw, int t) {
	Y[-1 - sw] = t;
}

int getStateSW(int sw) {
	int state = swState[sw];
	swState[sw] = 1 - state;
	return state;
}

int& goAlong(int node, int step) {
	int* nodePtr = NULL;
	for (int i = 0; i < step; i++) {
		assert(node < 0);
		int sw = -1 - node;
		if (getStateSW(sw) == 0) {
			nodePtr = &X[sw];
		} else {
			nodePtr = &Y[sw];
		}
		node = *nodePtr;
	}
	return *nodePtr;
}

int buildLevelSW(int lvl) {
	int root = getSW();
	Vi sws(1, root);
	for (int i = 1; i < lvl; i++) {
		Vi sw_lvl;
		for (int sw : sws) {
			int sw0 = getSW(root), sw1 = getSW(root);
			sw_lvl.push_back(sw0);
			sw_lvl.push_back(sw1);
			setSWX(sw, sw0);
			setSWY(sw, sw1);
		}
		sws = sw_lvl;
	}

	return root;
}

void build_answer(int node, const Vi& nexts) {
	if (nexts.size() == 0) {
		C[node] = 0;
		return;
	} else if (nexts.size() == 1) {
		C[node] = nexts[0];
		return;
	}

	int lvlSW = getLevelSW(nexts.size());
	int numSW = (1 << lvlSW) - 1;
	int root = buildLevelSW(lvlSW);

	forR(i, ((1 << lvlSW) - nexts.size())) {
		goAlong(root, lvlSW) = root;
	}
	for (int next : nexts) {
		goAlong(root, lvlSW) = next;
	}
	C[node] = root;
}


void create_circuit(int M, Vi A) {
	int n = A.size();

	X = Y = swState = Vi();
	C = Vi(M + 1);
	C[0] = A[0];

	Vii nexts(M + 1);
	A.push_back(0);
	forR(i, n) {
		nexts[A[i]].push_back(A[i + 1]);
	}

	int lvl = getLevelSW(n);
	int root = buildLevelSW(lvl);

	int skips = (1 << lvl) - n;
	forR(i, skips) goAlong(root, lvl) = root;
	forR(i, n) goAlong(root, lvl) = A[i + 1];
	forR(i, M) C[i + 1] = root;

	//forR(i, M) {
	//	build_answer(i + 1, nexts[i + 1]);
	//}

	answer(C, X, Y);
}

Compilation message (stderr)

doll.cpp: In function 'void build_answer(int, const Vi&)':
doll.cpp:24:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 | #define forR(i, n) for (int i = 0; i < (n); i++)
      |                                      ^
doll.cpp:104:2: note: in expansion of macro 'forR'
  104 |  forR(i, ((1 << lvlSW) - nexts.size())) {
      |  ^~~~
doll.cpp:101:6: warning: unused variable 'numSW' [-Wunused-variable]
  101 |  int numSW = (1 << lvlSW) - 1;
      |      ^~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 10
• Subtask 4: 10 / 10
• Subtask 5: 9.0000000036 / 18
• Subtask 6: 28.0000000112 / 56