Submission #97611

#	Time	Username	Problem	Language	Result	Execution time	Memory
97611		polyfish	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	0 / 100	3 ms	384 KiB

joi2019_ho_t3

//Pantyhose(black) + glasses = infinity

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

#define debug(x) cerr << #x << " = " << x << '\n';
#define BP() cerr << "OK!\n";
#define PR(A, n) {cerr << #A << " = "; for (int _=1; _<=n; ++_) cerr << A[_] << ' '; cerr << '\n';}
#define PR0(A, n) {cerr << #A << " = "; for (int _=0; _<n; ++_) cerr << A[_] << ' '; cerr << '\n';}
#define FILE_NAME "data"

const int MAX_N = 402;
const int INF = 1e9;

int n;
map<tuple<int, int, int, int>, int> f;
vector<int> a[3];

void readInput() {
	cin >> n;

	for (int i=1; i<=n; ++i) {
		char c;
		cin >> c;

		if (c=='R')
			a[0].push_back(i);
		else if (c=='G')
			a[1].push_back(i);
		else
			a[2].push_back(i);
	}
}

int bisect(int idx, int curPos, int bound) {
	int l = 0, r = bound;

	for (int mid=(l+r)/2; mid!=l && r!=mid; mid=(l+r)/2) {
		if (a[idx][mid]>curPos)
			l = mid;
		else
			r = mid;
	}

	for (int i=l; i<=r; ++i) {
		if (a[idx][i]>curPos)
			return bound - i + 1;
	}

	return 0;
}

int cost(int curPos, int newPos, int i, int j, int k) {
	int realPos = curPos + bisect(0, curPos, i-1)
					+ bisect(1, curPos, j-1) + bisect(2, curPos, k-1);

	return realPos - newPos;
}

int dp(int cur, int i, int j, int k, int prv) {
	if (cur==n+1)
		return 0;

	if (f.count(make_tuple(i, j, k, prv)))
		return f[make_tuple(i, j, k, prv)];

	int res = INF;

//    if (i<a[0].size())
//        debug(cost(a[0][i], cur, i, j, k));
	if (i<a[0].size() && prv!=0) {
		res = min(res, dp(cur+1, i+1, j, k, 0) +
					cost(a[0][i], cur, i, j, k));
	}
	if (j<a[1].size() && prv!=1) {
		res = min(res, dp(cur+1, i, j+1, k, 1) +
					cost(a[1][j], cur, i, j, k));
	}
	if (k!=a[2].size() && prv!=2) {
		res = min(res, dp(cur+1, i, j, k+1, 2) +
					cost(a[2][k], cur, i, j, k));
	}

	return f[make_tuple(i, j, k, prv)] = res;
}

void solve() {
	// debug(dp(10, 3, 4, 2, 1));
	int tmp = dp(1, 0, 0, 0, 3);

	if (tmp==INF)
		cout << -1;
	else
		cout << tmp;
}



int main() {
	#ifdef GLASSES_GIRL
		freopen(FILE_NAME".in", "r", stdin);
		freopen(FILE_NAME".out", "w", stdout);
	#endif
	ios::sync_with_stdio(0); cin.tie(0);
	readInput();
	//debug(cost(4, 1, 0, 0, 0));
	solve();
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int dp(int, int, int, int, int)':
joi2019_ho_t3.cpp:71:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (i<a[0].size() && prv!=0) {
      ~^~~~~~~~~~~~
joi2019_ho_t3.cpp:75:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (j<a[1].size() && prv!=1) {
      ~^~~~~~~~~~~~
joi2019_ho_t3.cpp:79:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (k!=a[2].size() && prv!=2) {
      ~^~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 55
• Subtask 3: 0 / 15
• Subtask 4: 0 / 25