Submission #794320

#	Time	Username	Problem	Language	Result	Execution time	Memory
794320		Tsovak	Paint By Numbers (IOI16_paint)	C++17	80 / 100	2072 ms	1380 KiB

paint

// -------------------- Includes -------------------- //
#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <stdio.h>
#include <cstdlib>
#include <stdlib.h>
#include <array>
#include <string>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <math.h>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <tuple>
#include <utility>
#include <cassert>
#include <assert.h>
#include <climits>
#include <limits.h>
#include <ctime>
#include <time.h>
#include <random>
#include <chrono>
#include <fstream>
#include "paint.h"
using namespace std;

// -------------------- Typedefs -------------------- //

typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;

// -------------------- Defines -------------------- //

#define pr pair
#define mpr make_pair
#define ff first
#define ss second

#define mset multiset
#define mmap multimap
#define uset unordered_set
#define umap unordered_map
#define umset unordered_multiset
#define ummap unordered_multimap
#define pqueue priority_queue

#define sz(x) (int((x).size()))
#define len(x) (int((x).length()))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()

#define pf push_front
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ft front
#define bk back

#define lb lower_bound
#define ub upper_bound
#define bs binary_search

// -------------------- Constants -------------------- //

const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18 + 5);
const ll MOD = ll(1e9 + 7);
const ll MOD2 = ll(998244353);

// -------------------- Functions -------------------- //

void fastio()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	return;
}

void precision(int x)
{
	cout.setf(ios::fixed | ios::showpoint);
	cout.precision(x);
	return;
}

ll gcd(ll a, ll b)
{
	while (b) {
		a %= b;
		swap(a, b);
	}
	return a;
}

ll lcm(ll a, ll b)
{
	return a / gcd(a, b) * b;
}

bool is_prime(ll a)
{
	if (a == 1) {
		return false;
	}
	for (ll i = 2; i * i <= a; i++) {
		if (a % i == 0) {
			return false;
		}
	}
	return true;
}

bool is_square(ll a)
{
	ll b = ll(sqrt(a));
	return (b * b == a);
}

bool is_cube(ll a)
{
	ll b = ll(cbrt(a));
	return (b * b * b == a);
}

int digit_sum(ll a)
{
	int sum = 0;
	while (a) {
		sum += int(a % 10);
		a /= 10;
	}
	return sum;
}

ll binpow(ll a, int b)
{
	ll ans = 1;
	while (b) {
		if ((b & 1) == 1) {
			ans *= a;
		}
		b >>= 1;
		a *= a;
	}
	return ans;
}

ll binpow_by_mod(ll a, ll b, ll mod)
{
	ll ans = 1;
	while (b) {
		if ((b & 1) == 1) {
			ans *= a;
			ans %= mod;
		}
		b >>= 1;
		a *= a;
		a %= mod;
	}
	return ans;
}

ll factorial(int a)
{
	ll ans = 1;
	for (int i = 2; i <= a; i++) {
		ans *= ll(i);
	}
	return ans;
}

ll factorial_by_mod(int a, ll mod)
{
	ll ans = 1;
	for (int i = 2; i <= a; i++) {
		ans *= ll(i);
		ans %= mod;
	}
	return ans;
}

// -------------------- Solution -------------------- //

const int N = 200005, K = 105;
int p[N];
int n, k;

bool dp[N][K][2];

bool a1[N], a2[N];

string solve_puzzle(string s, vector<int> c)
{
	int i, j;

	reverse(all(s));
	s.pb(' ');
	reverse(all(s));
	n = len(s) - 1;
	reverse(all(c));
	c.pb(0);
	reverse(all(c));
	k = sz(c) - 1;

	for (int h = 1; h <= n; h++) {
		if (s[h] != '.') continue;

		for (i = 1; i <= n; i++) p[i] = p[i - 1] + int(s[i] == '_');

		s[h] = 'X';

		for (i = 0; i <= n; i++) for (j = 0; j <= k; j++) dp[i][j][0] = dp[i][j][1] = false;
		dp[0][0][0] = true;

		for (i = 0; i < n; i++) {
			for (j = 0; j <= k; j++) {
				if (dp[i][j][0]) {
					if (s[i + 1] == '_' || s[i + 1] == '.') {
						dp[i + 1][j][0] = true;
					}
					if (s[i + 1] == 'X' || s[i + 1] == '.') {
						if (j < k && i + c[j + 1] <= n && p[i + c[j + 1]] - p[i] == 0) {
							dp[i + c[j + 1]][j + 1][1] = true;
						}
					}
				}
				if (dp[i][j][1]) {
					if (s[i + 1] == '_' || s[i + 1] == '.') {
						dp[i + 1][j][0] = true;
					}
				}
			}
		}

		/*for (i = 0; i <= n; i++) {
			for (j = 0; j <= k; j++) {
				cout << i << ' ' << j << ' ' << dp[i][j][0] << ' ' << dp[i][j][1] << "\n";`
			}
		}*/

		if (dp[n][k][0] || dp[n][k][1]) a1[h] = true;
		 
		//------------------------------------------

		s[h] = '_';
		for (i = h; i <= n; i++) p[i]++;

		for (i = 0; i <= n; i++) for (j = 0; j <= k; j++) dp[i][j][0] = dp[i][j][1] = false;
		dp[0][0][0] = true;

		for (i = 0; i < n; i++) {
			for (j = 0; j <= k; j++) {
				if (dp[i][j][0]) {
					if (s[i + 1] == '_' || s[i + 1] == '.') {
						dp[i + 1][j][0] = true;
					}
					if (s[i + 1] == 'X' || s[i + 1] == '.') {
						if (j < k && i + c[j + 1] <= n && p[i + c[j + 1]] - p[i] == 0) {
							dp[i + c[j + 1]][j + 1][1] = true;
						}
					}
				}
				if (dp[i][j][1]) {
					if (s[i + 1] == '_' || s[i + 1] == '.') {
						dp[i + 1][j][0] = true;
					}
				}
			}
		}

		if (dp[n][k][0] || dp[n][k][1]) a2[h] = true;

		s[h] = '.';
	}

	string t = "";

	for (i = 1; i <= n; i++) {
		if (s[i] == '.') {
			if (!a1[i]) t += '_';
			else if (!a2[i]) t += 'X';
			else t += '?';
		}
		else {
			t += s[i];
		}
	}

	return t;
}

/*
	# # # #   # # # #   # # # #   #       #    #       #     #
	   #      #         #     #    #     #    # #      #   #
	   #      # # # #   #     #     #   #    #   #     # #
	   #            #   #     #      # #    # # # #    #   #
	   #      # # # #   # # # #       #    #       #   #     #
*/

• Subtask 1: 7 / 7
• Subtask 2: 3 / 3
• Subtask 3: 22 / 22
• Subtask 4: 27 / 27
• Subtask 5: 21 / 21
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10