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11075: 【原1075】括号匹配 11.07

题目

题目描述

author: lsz 原OJ链接:https://acm.sjtu.edu.cn/OnlineJudge-old/problem/1075

Description

括号匹配发布了11.07版XD

给定一个N表示字符串的长度,问此长度的由左右小括号和小写字母a构成的合法的字符串有多少个

合法的字符串如下定义:

1 空串是合法的

2 如果P是合法的,那么aP也是合法的

3 如果P是合法的,那么(P)也是合法的

4 如果P和Q都是合法的,那么PQ也是合法的

请输出答案除以19301的余数

Input Format

\( N. (0 < N \leq 3333) \)

Output Format

答案除以19301的余数

Sample Input 1

1

Sample Output 1

1

Sample Input 2

3

Sample Output 2

4

Sample Input 3

4

Sample Output 3

9

FineArtz's solution

/* 括号匹配 11.07 */
#include <iostream>
using namespace std;

const int MOD = 19301;

int main(){
    long long f[3335] = {0};
    int n;
    cin >> n;
    f[0] = 1;
    f[1] = 1;
    for (int i = 2; i <= n; ++i){
        f[i] += f[i - 1];
        for (int j = 1; j <= i - 1; ++j){
            f[i] += f[j - 1] *  f[i - j - 1];
            f[i] %= MOD;
        }
        f[i] %= MOD;
    }
    cout << f[n] << endl;
    return 0;
}

ligongzzz's solution

#include "iostream"
#include "cstdio"
#include "cmath"
#include "cstring"
using namespace std;

constexpr long long mod = 19301;
long long tree_num[3350] = { 0 };

long long jc[3350] = { 0 };

long long fast_pow(long long a, long long b) {
    long long ans = 1, base = a;
    while (b) {
        if (b & 1)
            ans = (ans * base) % mod;
        base = (base * base) % mod;
        b >>= 1;
    }
    return ans;
}

long long get_zhs(int n, int m) {
    long long temp = (jc[m] * jc[n - m]) % mod;
    temp = fast_pow(temp, mod - 2);
    temp = (jc[n] * temp) % mod;
    return temp;
}

long long cal_tree(int n) {
    if (n == 0)
        return 1LL;
    if (tree_num[n] > 0)
        return tree_num[n];
    long long ans = 0;
    for (int i = 0; i < n; ++i) {
        ans = (ans + cal_tree(n - i - 1) * cal_tree(i)) % mod;
    }
    tree_num[n] = ans;
    return ans;
}

int main() {
    jc[0] = 1;
    for (long long i = 1LL; i <= 3350LL; ++i) {
        jc[i] = (jc[i - 1] * i) % mod;
    }
    long long n;
    cin >> n;

    long long ans = 0;
    for (int i = 0; i <= n; i += 2) {
        ans = (ans + get_zhs(n, i) * cal_tree(i / 2)) % mod;
    }

    cout << ans;

    return 0;
}

q4x3's solution

/**
 * 括号匹配
 * dp
 * 按第一个字符分类:
 * ‘a’: f[n - 1]
 * '(': 按对应')'位置,若为j,则f[j - 1] * f[n - j - 1]
 **/
#include <iostream>

using namespace std;

int f[3340];
int main() {
    int N;
    cin >> N;
    f[0] = 1;
    f[1] = 1;
    for(int i = 2;i <= N;++ i) {
        f[i] += f[i - 1];
        for(int j = 1;j < i;++ j) {
            f[i] += (f[j - 1] * f[i - j - 1] % 19301);
            f[i] %= 19301;
        }
    }
    cout << f[N] << endl;
}

victrid's solution

#include <iostream>
using namespace std;
int main() {
    unsigned short ans[3335] = {1,1,2,4,9,21,51,127,323,835,2188,5798,15511,3233,17129,1756,4223,2057,12644,17742,13185,9674,16560,14982,14280,15456,9603,3212,14660,18549,2234,2214,12614,4301,15589,17775,10176,12374,6701,13423,3195,16695,13109,33,12490,11545,12863,10973,13555,5069,19213,9441,2024,10011,10412,12158,2060,3304,16174,6172,14014,16503,2036,12600,9402,17905,12310,15883,19283,16513,12181,9760,6455,9879,3430,16409,16099,763,4556,18296,3898,4284,1769,6337,4109,3803,6662,4606,10364,12751,1667,8546,1333,13840,13630,12355,6264,9678,622,15638,3108,10635,510,4426,17861,2490,16795,13477,4710,18897,13299,2348,308,2601,6534,17534,15451,18533,7488,6482,2126,15169,9578,6210,1720,17030,10050,12314,15493,16633,18653,11212,6733,7174,18474,9553,5562,18216,11838,3812,7511,14048,11667,6861,11376,18655,7379,18151,14399,9025,10694,16311,2725,2827,8421,15411,7671,9210,12963,1610,5259,18241,5738,5793,17571,17683,5482,11695,1078,3761,1769,13479,11309,8456,5483,1789,3021,7171,8337,15832,750,13400,4249,15322,15232,17442,10787,9787,12058,1795,18965,13935,3481,15704,15552,6720,17176,7103,6276,1473,11822,16984,10192,11785,18019,4045,8788,6231,1137,19130,4844,9114,10061,2864,8377,29,1292,13228,4832,7609,13505,3649,3,10807,7815,1690,8971,18951,13195,2372,11424,19205,3948,4276,17574,6546,514,6119,4275,1558,3560,493,1008,8664,3733,11608,18029,8389,14374,6228,6738,16906,12250,12714,13949,5351,7563,8251,232,18718,16546,3507,2751,6113,11900,8402,589,1127,17714,12366,799,9222,12613,4165,14663,15258,6451,14324,15311,3392,9689,9224,12926,16120,18073,555,2887,16341,6875,1707,807,9441,13304,1250,5349,319,17427,704,11662,16578,3847,17340,16921,3740,6807,18308,4710,15981,8008,12343,5861,16891,140,17014,9973,10133,13026,3101,3689,12050,8158,5505,14297,15784,9089,9057,14685,17616,10471,14730,15401,7858,10985,3867,15200,11465,16459,3665,3218,19287,3785,16780,2084,18639,3987,13146,9917,9185,15141,14416,6685,7203,14929,15764,11450,1415,12781,2353,13115,8955,8229,11290,892,12683,11621,12501,10597,17664,4381,1098,5418,2262,14127,17579,15051,18509,479,13773,9054,16325,3538,1869,15310,5784,16994,951,11045,13672,9194,4275,8660,11122,15120,15254,18968,3574,16653,18281,4945,10859,640,5209,9753,15644,7494,16989,6640,10263,15228,13995,767,6616,12811,1609,6008,4268,14764,5237,17051,17671,11363,16695,7760,17966,203,5694,11096,5064,776,7363,10419,6908,8920,290,9358,5824,3003,17007,16877,8816,18821,8451,2243,12217,16668,18203,9137,14812,1810,4610,15779,17966,8907,13607,13036,5849,9676,8968,4254,14401,19204,12340,14619,11633,2650,18177,4421,3241,7402,16550,1573,18929,18240,2627,14239,17890,953,5148,16362,14865,16871,16216,13203,5347,939,16348,8619,18327,17021,13148,16593,12820,1781,8557,13812,6610,4370,15699,18356,18464,2895,10222,4086,14018,18930,16054,3665,14954,12253,11243,11239,18245,10724,8979,16114,11876,18239,11995,1712,18335,9170,17731,15234,772,8012,3192,8771,14025,14950,16585,18791,11594,1433,8764,18333,10844,1376,12285,19278,3711,3202,15645,13118,382,14872,2327,10728,8090,12069,17875,9774,11017,10271,9749,11143,14550,16509,2076,635,11177,15672,16686,12085,7079,6057,5021,906,7700,17860,7158,19055,7633,7666,15246,3832,10662,11534,6426,10104,17276,13481,17770,9155,6963,2481,1071,11708,7678,15128,4011,15760,5559,8124,783,12631,15218,7287,15142,3997,13929,7466,6445,5650,3394,1852,15321,5461,14797,18296,14022,12770,15417,5666,15150,14430,18462,6458,402,12860,19119,1663,8599,12100,7847,11238,19254,4354,9805,9310,3376,14927,3914,11676,2582,138,2137,14266,15998,6603,15417,3218,15265,3414,5174,4982,13160,5572,16810,10926,3245,14976,2272,11893,16431,7634,5693,12598,14316,16182,1110,16254,13479,10763,12246,5198,12655,13357,3430,1883,11873,16392,16090,13827,11054,8565,8255,4136,4171,18321,3445,9806,14316,7574,14370,5270,9274,17753,19037,13479,5134,9702,14895,14180,2252,15570,17862,15792,9822,14221,13750,18865,8850,17950,2715,17075,583,2774,3630,13248,881,10296,2120,8714,17705,12981,18717,16889,4018,15450,10930,1568,16082,18174,15368,5213,1548,6495,670,17966,8024,4670,19286,13318,382,1532,12239,7900,15980,11159,13366,15825,1358,10536,6952,8773,2394,2479,11689,17305,18581,17341,13545,6051,17733,4305,8395,12153,14861,17218,4133,4153,9459,7291,5958,2108,4573,10376,92,13644,18723,16768,8947,14928,6278,12223,11265,15252,13541,1122,12260,4576,7985,19152,7781,14645,10232,18953,14253,1441,14460,5317,17540,1631,4038,8983,12419,13037,12317,12501,1913,6382,3339,2190,18931,10261,1512,10588,9194,17689,13005,18648,18124,9214,12721,15398,5473,15871,13612,11414,14386,15218,16557,5015,12899,5738,6322,10192,3902,8583,7059,13581,4607,12997,7219,14615,16790,15781,11899,10407,2827,4295,14072,3406,5947,16237,9587,11369,3207,2741,13812,13682,6585,12938,5763,1097,10928,19226,12320,2042,13537,16719,8857,17135,17357,12956,17985,1062,11690,13603,16792,4937,4611,4577,5939,9810,16677,10461,2172,12912,5787,13723,4307,10852,1700,7041,15420,18128,10631,10042,2641,8575,18728,10116,14409,7037,1231,5358,13885,8938,924,4390,14029,6144,6933,8631,10406,522,2728,51,3958,14341,18928,8223,7963,14023,14977,4220,9295,15339,5926,5805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44,4114,2966,14662,8942,484,19071,13640,7275,4280,16762,9731,4696,3883,1326,12726,4320,2721,17401,8894,5270,4207,12680,1863,10327,1754,7420,4421,8582,8721,14410,4452,11557,6382,1285,7704,6381,12377,6087,4136,17694,2357,3235,8090,13136,11804,4434,13002,1821,692,6861,1823,8396,17421,12714,16648,14810,1184,17658,5038,16098,6682,1609,6634,8988,5829,9755,13935,15730,17758,10114,11125,16618,11095,12385,15004,8689,6731,7161,3100,17610,11867,18078,12355,13172,16491,654,19234,4902,17728,12188,14753,3536,10823,14327,11385,16373,4632,12166,5983,14355,16745,10678,5682,3607,17807,6090,12854,18918,12583,14103,15603,8204,9137,8302,10258,1682,6692,15434,10379,300,17663,16565,12329,2686,4777,13976,17944,1390,7036,3200,5984,6918,1879,38,1537,713,15682,17592,18907,1102,15385,2574,1687,6697,7427,9235,8038,3083,13592,2115,6221,19270,973,13660,10703,12915,10340,4639,10835,8440,13213,12808,1508,14275,13971,14813,3592,11512,14634,11923,17310,15479,19185,2299,2024,14379,10401,2272,1376,9671,2564,17812,17852,17835,8713,12187,8383,2217,13088,7638,3519,14427,5948,17190,2522,17384,1089,7459,16287,16427,17295,8693,740,13597,12974,11859,3576,6741,14717,15422,5826,12791,18981,4130,3957,9178,6707,11836,7195,17256,1585,4543,8887,15777,8075,9856,4740,14164,8891,14047,3802,4584,1064,17010,5765,18271,13182,1914,2997,15065,957,18429,1747,2225,16412,11053,14410,13804,8309,2451,15374,16169,15721,15983,6282,5640,346,3226,15446,15142,11621,13697,8319,17155,11202,12754,12845,4097,19223,11659,9407,14364,13321,12080,14068,6601,17130,17098,9886,14471,17162,8880,5892,1555,4938,15031,917,730,5616,9020,13706,5211,574,18827,3042,7893,12933,6285,18313,14596,18768,1625,16790,6475,12769,5042,17501,5412,5173,1414,16280,117,5480,16342,2925,17751,15525,17912,16484,18060,352,6263,9621,1768,10278,13171,4826,8724,10246,17886,4610,3592,18295,13877,14963,19017,8530,11035,13242,3772,4192,8169,18747,7239,9232,2783,12723,12714,10111,3071,13143,14549,1998,4260,11141,14366,5831,17266,11667,13619,9744,691,15718,14530,12188,2044,12458,6650,16412,4256,126,5623,7211,15912,13609,14751,4601,8743,13942,5997,13143,4254,9900,16688,6476,4545,7597,1714,14472,7919,9327,6582,2443,17931,6323,5074,39,668,16687,15072,11877,14984,10114,4705,11029,14263,17165,8290,8262,13040,7151,8626,9889,15345,10394,16871,6121,1305,12558,14190,6407,9001,8130,14469,5819,4688,5088,13022,7088,13836,4652,1035,11627,10662,9031,18946,298,2055,18589,2479,4031,590,7543,2896,4331,14112,7472,3677,11759,10349,15855,11178,6143,6444,16252,1661,2695,9522,662,10191,13047,5723,8848,14823,12587,3938,6119,373,14493,14224,3414,6112,10906,10029,14319,1263,19049,1652,5544,13187,3598,7830,19144,13501,630,3040,4110,7366,12248,5667,18341,1581,2906,16372,16150,2549,19068,10526,17856,12266,4769,12065,18616,492,1638,15983,6860,8737,4816,1789,17440,4891,10343,4511,7168,2476,5605,10042,15782,11085,13444,17995,19193,14766,5051,4605,15591,8641,70,10444,15552,17894,4304,8550,9955,7697,5069,17640,3781,7471,8729,17532,9122,4446,10005,10810,16275,11487,13888,16888,12144,19109,15319,269,19146,15174,9750,3534,16175,5840,4915,3692,6063,5902,11070,1027,18381,70};
    int n;
    cin >> n;
    if(ans[n]!=0){
        cout << ans[n];
        return 0;
    }
    long long tmp;
    for (int i = 2; i <= n; i++) {
        tmp = ans[i - 1]; /*add a at back*/
        for (int j = 0; j < i; j++) {
            /*add ) at back. the ) must not belong to any original pairs.*/
            /*a ( should be inserted between legals*/
            tmp += ans[j] * ans[i - j - 2];
            tmp %= 19301;
        }
        ans[i] = tmp;
    }
    cout << ans[n];
    return 0;
}

yyong119's solution

#include <iostream>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <cmath>
#include <algorithm>
using namespace std;

int num[4000];

int main(){

    int n;
    cin >> n;
    memset(num, 0, sizeof(num));
    num[0] = 1;
    num[1] = 1;
    for (int i = 2; i <= n; ++i){
        num[i] += num[i - 1];
        for (int j = 1; j < i; ++j){
            num[i] += num[j - 1] * num[i - j - 1];
            num[i] %= 19301;
        }

    }
    cout << num[n] << endl;

    return 0;
}

zqy2018's solution

#include <bits/stdc++.h>
#define INF 2000000000
#define M 19301
using namespace std;
typedef long long ll;
int read(){
    int f = 1, x = 0;
    char c = getchar();
    while(c < '0' || c > '9'){if(c == '-') f = -f; c = getchar();}
    while(c >= '0' && c <= '9')x = x * 10 + c - '0', c = getchar();
    return f * x; 
}
int n, f[3335][2000] = {0};
void init(){
    cin >> n;
}
void solve(){
    f[0][0] = 1;
    int hf = (n >> 1);
    for (int i = 1; i <= n; ++i){
        f[i][0] = (f[i - 1][0] + f[i - 1][1]) % M;
        for (int j = 1; j < hf; ++j)
            f[i][j] = (f[i - 1][j - 1] + f[i - 1][j] + f[i - 1][j + 1]) % M;
        f[i][hf] = (f[i - 1][hf - 1] + f[i - 1][hf]) % M;
    }
    cout << f[n][0] << endl;
}
int main(){
    init();
    solve();
    return 0;
}