답안 #58912 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
58912	2018-07-19T19:31:11 Z	SpeedOfMagic	세 명의 친구들 (BOI14_friends)	C++17	100 / 100	353 ms	98984 KB

friends

/** MIT License Copyright (c) 2018 Vasilyev Daniil **/
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
template<typename T> using v = vector<T>;
#define int long long
typedef string str;
typedef vector<int> vint;
#define rep(a, l, r) for(int a = (l); a < (r); a++)
#define pb push_back
#define sz(a) ((int) a.size())
const long long inf = 4611686018427387903; //2^62 - 1
#if 0  //FileIO
const string fileName = "";
ifstream fin ((fileName == "" ? "input.txt"  : fileName + ".in" ));
ofstream fout((fileName == "" ? "output.txt" : fileName + ".out"));
#define get fin>>
#define put fout<<
#else
#define get cin>>
#define put cout<<
#endif
#define eol put endl
void read() {}     template<typename Arg,typename... Args> void read (Arg& arg,Args&... args){get (arg)     ;read(args...) ;}
void print(){}     template<typename Arg,typename... Args> void print(Arg  arg,Args...  args){put (arg)<<" ";print(args...);}
void debug(){eol;} template<typename Arg,typename... Args> void debug(Arg  arg,Args...  args){put (arg)<<" ";debug(args...);}
int getInt(){int a; get a; return a;}
//code goes here
const long long mod1 = 1999998893;
const long long mod2 = 2100003611;
const long long base = 29;
const char startingLetter = 'A'; //starting letter of the alphabet

long long hashChar(char c){
    return c - startingLetter + 1;
}

pair<long long, long long> hashStr(pair<long long, long long> prevHash, char curChar) {
    return {((prevHash.first * base) % mod1 + hashChar(curChar)) % mod1,
            ((prevHash.second * base) % mod2 + hashChar(curChar)) % mod2};
}

const int N = 2e6 + 1;
int powOfBase1[N], powOfBase2[N];

void run() {
    int n;
    get n;
    str u;
    get u;

    powOfBase1[0] = 1;
    powOfBase2[0] = 1;
    rep(i, 1, n + 1) {
        powOfBase1[i] = (base * powOfBase1[i - 1]) % mod1;
        powOfBase2[i] = (base * powOfBase2[i - 1]) % mod2;
    }

    str left = "", right = "";
    rep(i, 0, n / 2 + 1)
        left += u[i];

    rep(i, n / 2 + 1, n)
        right += u[i];

    str ans = "";
    pair<int, int> ansHsh = {0, 0};

    rep(z, 0, 2) {
        v<pair<int, int>> hshLeft, hshRight;
        hshLeft.pb({hashChar(left[0]), hashChar(left[0])});
        rep(i, 1, sz(left)) {
            auto d = hshLeft.back();
            hshLeft.pb(hashStr(d, left[i]));
        }

        hshRight.pb({hashChar(right[0]), hashChar(right[0])});
        rep(i, 1, sz(right)) {
            auto d = hshRight.back();
            hshRight.pb(hashStr(d, right[i]));
        }

        if (z) {
            //debug(sz(hshRight), right, sz(hshLeft), left);
            rep(i, 1, sz(right)) {
                auto resultHash = hshRight.back();
                int offset = sz(right) - (i + 1);
                resultHash.first =
                ((resultHash.first - (powOfBase1[offset] * hshRight[i].first) % mod1) % mod1 + mod1) % mod1;

                if (i)
                    resultHash.first = (resultHash.first + (powOfBase1[offset] * hshRight[i - 1].first) % mod1) % mod1;

                resultHash.second =
                ((resultHash.second - (powOfBase2[offset] * hshRight[i].second) % mod2) % mod2 + mod2) % mod2;

                if (i)
                    resultHash.second = (resultHash.second + (powOfBase2[offset] * hshRight[i - 1].second) % mod2) % mod2;

                if (resultHash == hshLeft.back()) {
                    if (ans == "") {
                        rep(j, 0, sz(right))
                            if (i != j)
                                ans += right[j];
                        for (char j : ans)
                            ansHsh = hashStr(ansHsh, j);
                    } else {
                        if (resultHash != ansHsh) {
                            put "NOT UNIQUE";
                            return;
                        }
                    }
                }

            }
        } else {
            rep(i, 0, sz(left)) {
                auto resultHash = hshLeft.back();
                int offset = sz(left) - (i + 1);
                resultHash.first =
                ((resultHash.first - (powOfBase1[offset] * hshLeft[i].first) % mod1) % mod1 + mod1) % mod1;

                if (i)
                    resultHash.first = (resultHash.first + (powOfBase1[offset] * hshLeft[i - 1].first) % mod1) % mod1;

                resultHash.second =
                ((resultHash.second - (powOfBase2[offset] * hshLeft[i].second) % mod2) % mod2 + mod2) % mod2;

                if (i)
                    resultHash.second = (resultHash.second + (powOfBase2[offset] * hshLeft[i - 1].second) % mod2) % mod2;

                if (resultHash == hshRight.back()) {
                    if (ans == "") {
                        rep(j, 0, sz(left))
                            if (i != j)
                                ans += left[j];
                        for (char j : ans)
                            ansHsh = hashStr(ansHsh, j);
                    } else {
                        if (resultHash != ansHsh) {
                            put "NOT UNIQUE";
                            return;
                        }
                    }

                }

            }
        }

        if (z)
            break;

        right = left.back() + right;
        left.pop_back();
    }
    //debug(ans[0]);
    if (sz(ans) == 0)
        put "NOT POSSIBLE";
    else
        put ans;
}

int32_t main() {srand(time(0)); ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); put fixed; put setprecision(15); run(); return 0;}

Subtask #1
35.0 / 35.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	3 ms	456 KB	Output is correct
3	Correct	2 ms	456 KB	Output is correct
4	Correct	2 ms	472 KB	Output is correct
5	Correct	3 ms	476 KB	Output is correct
6	Correct	2 ms	532 KB	Output is correct
7	Correct	3 ms	544 KB	Output is correct
8	Correct	3 ms	700 KB	Output is correct
9	Correct	2 ms	732 KB	Output is correct
10	Correct	2 ms	732 KB	Output is correct
11	Correct	3 ms	732 KB	Output is correct
12	Correct	2 ms	732 KB	Output is correct
13	Correct	3 ms	768 KB	Output is correct
14	Correct	3 ms	772 KB	Output is correct
15	Correct	2 ms	772 KB	Output is correct
16	Correct	3 ms	772 KB	Output is correct
17	Correct	2 ms	772 KB	Output is correct
18	Correct	2 ms	772 KB	Output is correct
19	Correct	2 ms	772 KB	Output is correct
20	Correct	3 ms	772 KB	Output is correct
21	Correct	4 ms	772 KB	Output is correct
22	Correct	3 ms	772 KB	Output is correct
23	Correct	2 ms	772 KB	Output is correct
24	Correct	3 ms	772 KB	Output is correct
25	Correct	2 ms	772 KB	Output is correct
26	Correct	2 ms	772 KB	Output is correct
27	Correct	2 ms	772 KB	Output is correct
28	Correct	3 ms	772 KB	Output is correct
29	Correct	2 ms	772 KB	Output is correct
30	Correct	2 ms	772 KB	Output is correct
31	Correct	2 ms	860 KB	Output is correct
32	Correct	2 ms	860 KB	Output is correct
33	Correct	2 ms	860 KB	Output is correct
34	Correct	3 ms	860 KB	Output is correct
35	Correct	2 ms	860 KB	Output is correct
36	Correct	2 ms	880 KB	Output is correct
37	Correct	2 ms	880 KB	Output is correct
38	Correct	2 ms	880 KB	Output is correct
39	Correct	3 ms	880 KB	Output is correct
40	Correct	2 ms	880 KB	Output is correct
41	Correct	2 ms	880 KB	Output is correct
42	Correct	2 ms	880 KB	Output is correct
43	Correct	3 ms	880 KB	Output is correct
44	Correct	2 ms	880 KB	Output is correct
45	Correct	3 ms	880 KB	Output is correct
46	Correct	2 ms	880 KB	Output is correct
47	Correct	3 ms	880 KB	Output is correct
48	Correct	3 ms	952 KB	Output is correct
49	Correct	2 ms	952 KB	Output is correct
50	Correct	5 ms	952 KB	Output is correct
51	Correct	2 ms	952 KB	Output is correct
52	Correct	3 ms	952 KB	Output is correct
53	Correct	3 ms	952 KB	Output is correct
54	Correct	3 ms	952 KB	Output is correct

Subtask #2
65.0 / 65.0

#	결과	실행 시간	메모리	Grader output
1	Correct	288 ms	87128 KB	Output is correct
2	Correct	284 ms	89276 KB	Output is correct
3	Correct	310 ms	91040 KB	Output is correct
4	Correct	289 ms	93044 KB	Output is correct
5	Correct	294 ms	94988 KB	Output is correct
6	Correct	284 ms	95516 KB	Output is correct
7	Correct	353 ms	98984 KB	Output is correct
8	Correct	260 ms	98984 KB	Output is correct
9	Correct	287 ms	98984 KB	Output is correct
10	Correct	237 ms	98984 KB	Output is correct
11	Correct	243 ms	98984 KB	Output is correct
12	Correct	2 ms	98984 KB	Output is correct
13	Correct	2 ms	98984 KB	Output is correct
14	Correct	3 ms	98984 KB	Output is correct
15	Correct	4 ms	98984 KB	Output is correct
16	Correct	3 ms	98984 KB	Output is correct
17	Correct	2 ms	98984 KB	Output is correct
18	Correct	2 ms	98984 KB	Output is correct
19	Correct	3 ms	98984 KB	Output is correct
20	Correct	2 ms	98984 KB	Output is correct
21	Correct	3 ms	98984 KB	Output is correct
22	Correct	3 ms	98984 KB	Output is correct
23	Correct	2 ms	98984 KB	Output is correct
24	Correct	2 ms	98984 KB	Output is correct
25	Correct	3 ms	98984 KB	Output is correct
26	Correct	2 ms	98984 KB	Output is correct
27	Correct	2 ms	98984 KB	Output is correct
28	Correct	2 ms	98984 KB	Output is correct
29	Correct	2 ms	98984 KB	Output is correct
30	Correct	2 ms	98984 KB	Output is correct
31	Correct	2 ms	98984 KB	Output is correct
32	Correct	3 ms	98984 KB	Output is correct
33	Correct	2 ms	98984 KB	Output is correct
34	Correct	3 ms	98984 KB	Output is correct
35	Correct	2 ms	98984 KB	Output is correct
36	Correct	2 ms	98984 KB	Output is correct
37	Correct	2 ms	98984 KB	Output is correct
38	Correct	3 ms	98984 KB	Output is correct
39	Correct	2 ms	98984 KB	Output is correct
40	Correct	2 ms	98984 KB	Output is correct
41	Correct	4 ms	98984 KB	Output is correct
42	Correct	3 ms	98984 KB	Output is correct
43	Correct	2 ms	98984 KB	Output is correct
44	Correct	2 ms	98984 KB	Output is correct
45	Correct	3 ms	98984 KB	Output is correct
46	Correct	3 ms	98984 KB	Output is correct
47	Correct	2 ms	98984 KB	Output is correct
48	Correct	2 ms	98984 KB	Output is correct
49	Correct	3 ms	98984 KB	Output is correct
50	Correct	3 ms	98984 KB	Output is correct
51	Correct	3 ms	98984 KB	Output is correct
52	Correct	2 ms	98984 KB	Output is correct
53	Correct	2 ms	98984 KB	Output is correct
54	Correct	2 ms	98984 KB	Output is correct

답안 #58912

Compilation message

Subtask #1 35.0 / 35.0

Subtask #2 65.0 / 65.0

Subtask #1
35.0 / 35.0

Subtask #2
65.0 / 65.0