Submission #86003

#	Time	Username	Problem	Language	Result	Execution time	Memory
86003		qkxwsm	parentrises (BOI18_parentrises)	C++14	11 / 100	2 ms	708 KiB

parentrises

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/rope>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

random_device(rd);
mt19937 rng(rd());
const long long FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();

struct custom_hash
{
	template<class T>
	unsigned long long operator()(T v) const
	{
		unsigned long long x = v;
		x += FIXED_RANDOM; x += 11400714819323198485ull;
		x = (x ^ (x >> 30)) * 13787848793156543929ull;
		x = (x ^ (x >> 27)) * 10723151780598845931ull;
		return x ^ (x >> 31);
	}
};

template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T, class U> using hash_table = gp_hash_table<T, U, custom_hash>;

template<class T>
void readi(T &x)
{
	x = 0;
	bool negative = false;
	char c = ' ';
	while (c < '-')
	{
		c = getchar();
	}
	if (c == '-')
	{
		negative = true;
		c = getchar();
	}
	while (c >= '0')
	{
		x = x * 10 + (c - '0');
		c = getchar();
	}
	if (negative)
	{
		x = -x;
	}
}
template<class T>
void printi(T output)
{
	if (output == 0)
	{
		putchar('0');
		return;
	}
	if (output < 0)
	{
		putchar('-');
		output = -output;
	}
	int buf[20], n = 0;
	while(output)
	{
		buf[n] = ((output % 10));
		output /= 10;
		n++;
	}
	for (n--; n >= 0; n--)
	{
		putchar(buf[n] + '0');
	}
	return;
}
template<class T>
void ckmin(T &a, T b)
{
	a = min(a, b);
}
template<class T>
void ckmax(T &a, T b)
{
	a = max(a, b);
}
long long expo(long long a, long long e, long long mod)
{
	return ((e == 0) ? 1 : ((expo(a * a % mod, e >> 1, mod)) * ((e & 1) ? a : 1) % mod));
}
template<class T, class U>
void nmod(T &x, U mod)
{
	if (x >= mod) x -= mod;
}
template<class T>
T gcd(T a, T b)
{
	return (b ? gcd(b, a % b) : a);
}
template<class T>
T randomize(T mod)
{
	return (uniform_int_distribution<T>(0, mod - 1))(rng);
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define PF push_front
#define fi first
#define se second
#define DBG(x) cerr << #x << " = " << x << endl;
#define SZ(x) ((int) (x.size()))
#define FOR(i, a, b) for (auto i = (a); i < (b); i++)
#define FORD(i, a, b) for (auto i = (a) - 1; i >= (b); i--)
#define ALL(x) x.begin(), x.end()

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-9;

#define MAGIC 347
#define SINF 10007
#define CO 1000007
#define INF 1000000007
#define BIG 1000000931
#define LARGE 1696969696967ll
#define GIANT 2564008813937411ll
#define LLINF 2696969696969696969ll
#define MAXN 1000013

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pdd;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<ld> vd;
typedef vector<pii> vpi;
typedef vector<pll> vpl;
typedef vector<pdd> vpd;

int Q;
int N;
int pid;
int arr[MAXN], ans[MAXN];

void solve()
{
	int mn = 0, mx = 0;
	// FOR(i, 0, N)
	// {
	// 	cerr << arr[i] << ' ';
	// }
	// cerr << endl;
	FOR(i, 0, N)
	{
		mn += min(arr[i] * 2, arr[i]);
		mx += max(arr[i] * 2, arr[i]);
		if (mx < 0)
		{
			ans[0] = -2;
			return;
		}
	}
	if (mx < 0 || mn > 0)
	{
		ans[0] = -2;
		return;
	}
	//otherwise i think there's a solution!
	//take mx, and reduce it
	FOR(i, 0, N)
	{
		if (arr[i] == 1)
		{
			ans[i] = 2;
		}
		if (arr[i] == -1)
		{
			ans[i] = 0;
		}
	}
	// FOR(i, 0, N)
	// {
	// 	cerr << ans[i] << ' ';
	// }
	// cerr << endl;
	bool cnt = 0;
	FORD(i, N + 1, 0)
	{
		if (i != N)
		{
			if (arr[i] == 1)
			{
				ans[i] = cnt;
				cnt ^= 1;
			}
			else
			{
				ans[i] = 2;
			}
			mx--;
		}
		if (mx == 0)
		{
			// cerr << "end " << i << endl;
			cnt ^= 1;
			//cnt is how much ONE exceeds ZERO?
			FOR(j, 0, i)
			{
				if (arr[j] == -1)
				{
					ans[j] = cnt;
					cnt ^= 1;
				}
			}
			break;
		}
	}
}
int get()
{

}

int32_t main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	// cout << fixed << setprecision(10);
	// cerr << fixed << setprecision(10);
	// freopen ("file.in", "r", stdin);
	// freopen ("file.out", "w", stdout);
	cin >> pid >> Q;
	if (pid == 1)
	{
		while(Q--)
		{
			string temps;
			cin >> temps; N = SZ(temps);
			FOR(j, 0, N)
			{
				arr[j] = (temps[j] == '(' ? 1 : -1);
			}
			solve();
			if (ans[0] == -2)
			{
				cout << "impossible\n";
				continue;
			}
			FOR(j, 0, N)
			{
				if (ans[j] == 0) cout << 'B';
				if (ans[j] == 1) cout << 'R';
				if (ans[j] == 2) cout << 'G';
			}
			cout << '\n';
		}
	}
	if (pid == 2)
	{
		while(Q--)
		{
			cin >> N;
			cout << get() << '\n';
		}
	}
	// cerr << "time elapsed = " << (clock() / (CLOCKS_PER_SEC / 1000)) << " ms" << endl;
	return 0;
}

Compilation message (stderr)

parentrises.cpp: In function 'int get()':
parentrises.cpp:234:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• Subtask 1: 0 / 5
• Subtask 2: 11 / 11
• Subtask 3: 0 / 6
• Subtask 4: 0 / 28
• Subtask 5: 0 / 6
• Subtask 6: 0 / 16
• Subtask 7: 0 / 28