oj.uz

Submission #65189

# Submission time Handle Problem Language Result Execution time Memory
65189 2018-08-07T01:56:39 Z qkxwsm Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 297 ms 63008 KB 
/*
PROG: source
LANG: C++11
    _____
  .'     '.
 /  0   0  \
|     ^     |
|  \     /  |
 \  '---'  /
  '._____.'
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

struct chash
{
        int operator()(int x) const
        {
                x ^= (x >> 20) ^ (x >> 12);
                return x ^ (x >> 7) ^ (x >> 4);
        }
        int operator()(long long x) const
        {
                return x ^ (x >> 32);
        }
};

template<typename T> using orderedset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using hashtable = gp_hash_table<T, U, chash>;

template<class T>
void readi(T &x)
{
	T input = 0;
	bool negative = false;
	char c = ' ';
	while (c < '-')
        {
		c = getchar();
	}
	if (c == '-')
	{
		negative = true;
		c = getchar();
	}
	while (c >= '0')
	{
		input = input * 10 + (c - '0');
		c = getchar();
	}
	if (negative)
	{
		input = -input;
	}
	x = input;
}
template<class T>
void printi(T output)
{
	if (output == 0)
	{
		putchar('0');
		return;
	}
	if (output < 0)
	{
		putchar('-');
		output = -output;
	}
	int aout[20];
	int ilen = 0;
	while(output)
	{
		aout[ilen] = ((output % 10));
		output /= 10;
		ilen++;
	}
	for (int i = ilen - 1; i >= 0; i--)
	{
		putchar(aout[i] + '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);
}
template<class T, class U>
T normalize(T x, U mod = 1000000007)
{
	return (((x % mod) + mod) % mod);
}
long long randomizell(long long mod)
{
	return ((1ll << 45) * rand() + (1ll << 30) * rand() + (1ll << 15) * rand() + rand()) % mod;
}
int randomize(int mod)
{
	return ((1ll << 15) * rand() + rand()) % mod;
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define debug(x) cerr << #x << " = " << x << endl;

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-10;

#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;

int TC;
int N;
int arr[MAXN];
pll pw[MAXN];
pll hashval[MAXN];
int ans;

pll gethash(int L, int R)
{
        pll res;
        res.fi = (hashval[R + 1].fi - hashval[L].fi * pw[R - L + 1].fi) % INF;
        if (res.fi < 0) res.fi += INF;
        res.se = (hashval[R + 1].se - hashval[L].se * pw[R - L + 1].se) % BIG;
        if (res.se < 0) res.se += BIG;
        return res;
}

int32_t main()
{
	ios_base::sync_with_stdio(0);
	srand(time(0));
	//	cout << fixed << setprecision(10);
	//	cerr << fixed << setprecision(10);
	if (fopen("input.in", "r"))
	{
		freopen ("input.in", "r", stdin);
		freopen ("output.out", "w", stdout);
	}
        pw[0] = {1, 1};
        for (int i = 1; i < MAXN; i++)
        {
                pw[i].fi = (pw[i - 1].fi * CO) % INF;
                pw[i].se = (pw[i - 1].se * CO) % BIG;
        }
        cin >> TC;
        while(TC--)
        {
                ans = 0;
                string temps;
                cin >> temps;
                N = temps.length();
                for (int i = 0; i < N; i++)
                {
                        arr[i] = temps[i] - 'a' + 1;
                }
                hashval[0] = {0, 0};
                for (int i = 0; i < N; i++)
                {
                        hashval[i + 1].fi = (hashval[i].fi * CO + arr[i]) % INF;
                        hashval[i + 1].se = (hashval[i].se * CO + arr[i]) % BIG;
                }
                // cerr << gethash(0, 1).fi << ' ' << gethash(4, 5).fi << endl;
                int lt = 0, rt = N - 1;
                for (int i = 0; ; i++)
                {
                        // cerr << lt << ' ' << i << ' ' << N - 1 - i << ' ' << rt << endl;
                        if (gethash(lt, i) == gethash(N - 1 - i, rt))
                        {
                                if (i >= N - 1 - i)
                                {
                                        ans++;
                                }
                                else
                                {
                                        ans += 2;
                                }
                                lt = i + 1;
                                rt = N - 2 - i;
                                if (lt > rt) break;
                        }
                        if (i == N - 1 - i || i + 1 == N - 1 - i)
                        {
                                ans++;
                                break;
                        }
                }
                cout << ans << '\n';
        }
	//	cerr << "time elapsed = " << (clock() / (CLOCKS_PER_SEC / 1000)) << " ms" << endl;
	return 0;
}

Compilation message

palindromic.cpp: In function 'int32_t main()':
palindromic.cpp:168:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ("input.in", "r", stdin);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
palindromic.cpp:169:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ("output.out", "w", stdout);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 15992 KB Output is correct
2 Correct 22 ms 15992 KB Output is correct
3 Correct 25 ms 16184 KB Output is correct
4 Correct 23 ms 16280 KB Output is correct
5 Correct 25 ms 16516 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 15992 KB Output is correct
2 Correct 22 ms 15992 KB Output is correct
3 Correct 25 ms 16184 KB Output is correct
4 Correct 23 ms 16280 KB Output is correct
5 Correct 25 ms 16516 KB Output is correct
6 Correct 24 ms 16516 KB Output is correct
7 Correct 24 ms 16516 KB Output is correct
8 Correct 24 ms 16516 KB Output is correct
9 Correct 23 ms 16516 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 15992 KB Output is correct
2 Correct 22 ms 15992 KB Output is correct
3 Correct 25 ms 16184 KB Output is correct
4 Correct 23 ms 16280 KB Output is correct
5 Correct 25 ms 16516 KB Output is correct
6 Correct 24 ms 16516 KB Output is correct
7 Correct 24 ms 16516 KB Output is correct
8 Correct 24 ms 16516 KB Output is correct
9 Correct 23 ms 16516 KB Output is correct
10 Correct 27 ms 16832 KB Output is correct
11 Correct 27 ms 16832 KB Output is correct
12 Correct 24 ms 17040 KB Output is correct
13 Correct 24 ms 17040 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 15992 KB Output is correct
2 Correct 22 ms 15992 KB Output is correct
3 Correct 25 ms 16184 KB Output is correct
4 Correct 23 ms 16280 KB Output is correct
5 Correct 25 ms 16516 KB Output is correct
6 Correct 24 ms 16516 KB Output is correct
7 Correct 24 ms 16516 KB Output is correct
8 Correct 24 ms 16516 KB Output is correct
9 Correct 23 ms 16516 KB Output is correct
10 Correct 27 ms 16832 KB Output is correct
11 Correct 27 ms 16832 KB Output is correct
12 Correct 24 ms 17040 KB Output is correct
13 Correct 24 ms 17040 KB Output is correct
14 Correct 297 ms 48944 KB Output is correct
15 Correct 170 ms 53592 KB Output is correct
16 Correct 266 ms 63008 KB Output is correct
17 Correct 181 ms 63008 KB Output is correct