oj.uz

Submission #874224

# Submission time Handle Problem Language Result Execution time Memory
874224 2023-11-16T13:01:08 Z vjudge1 Necklace (Subtask 1-3) (BOI19_necklace1) C++17
25 / 85
 1500 ms 2824 KB 
#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

const int PRI = 41;
const int MOD = 2000000011;

int mul(int a, int b) {
    return (1LL * a * b) % MOD;
}

int add(int a, int b) {
    return (0LL + a + b) % MOD;
}

int stra[405][405], strb[405][405];
int reva[405][405], revb[405][405];

#define ONLINE_JUDGE
void solve() {
    string a, b;
    cin >> a >> b;
    int n = int(a.size()), m = int(b.size());

    for(int l = 0; l < n; l++) {
        int res = 0;
        for(int r = l; r < n; r++) {
            res = mul(res, PRI);
            res = add(res, (a[r] - 'a' +1));
            stra[l][r] = res;
        }
    }

    for(int l = 0; l < m; l++) {
        int res = 0;
        for(int r = l; r < m; r++) {
            res = mul(res, PRI);
            res = add(res, (b[r] - 'a' +1));
            strb[l][r] = res;
        }
    }

    for(int r = n -1; r >= 0; r--) {
        int res = 0;
        for(int l = r; l >= 0; l--) {
            res = mul(res, PRI);
            res = add(res, (a[l] - 'a' +1));
            reva[l][r] = res;
        }
    }

    for(int len = min(n, m); len >= 1; len--) {
        for(int l = 0; l + len -1 < n; l++) {
            for(int r = 0; r + len -1 < m; r++) {
                for(int k = 0; k <= len; k++) {
                    //string x = a.substr(l, len);
                    //reverse(x.begin(), x.end());

                    //cerr << len << " -> " << x.substr(0, k) << " " << b.substr(r + len - k, k) << " :: " << x.substr(k, len - k) << " " << b.substr(r, len - k) << "\n";
                    //cerr << len << " -> " << reva[l + len - k][l + len -1] << " " << strb[r + len - k][r + len -1] << " :: " << reva[l][l + len - k -1] << " " << strb[r][r + len - k -1] << "\n";
                    if(reva[l + len - k][l + len -1] == strb[r + len - k][r + len -1] && reva[l][l + len - k -1] == strb[r][r + len - k -1]) {
                        cout << len << "\n";
                        cout << l << " " << r << "\n";
                        return;
                    }

                    //cerr << len << " -> " << a.substr(l, k) << " " << b.substr(r + len - k, k) << " :: " << a.substr(l + k, len - k) << " " << b.substr(r, len - k) << "\n";
                    //cerr << len << " -> " << stra[l][l + k -1] << " " << strb[r + len - k][r + len -1] << " :: " << stra[l + k][l + len -1] << " " << strb[r][r + len - k -1] << "\n";
                    if(stra[l][l + k -1] == strb[r + len - k][r + len -1] && stra[l + k][l + len -1] == strb[r][r + len - k -1]) {
                        cout << len << "\n";
                        cout << l << " " << r << "\n";
                        return;
                    }
                }
            }
        }
    }

    cout << 0 << "\n";
    cout << 0 << " " << 0 << "\n";
    
    return;
}

signed main() {
    #ifndef ONLINE_JUDGE
        freopen(".in", "r", stdin);
        freopen(".out", "w", stdout);
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int t = 1; //cin >> t;
    for(int i = 1; i <= t; i++) {
        solve();
    }

    return 0;
}

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2404 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 7 ms 2396 KB Output is correct
4 Correct 7 ms 2396 KB Output is correct
5 Correct 17 ms 2396 KB Output is correct

Subtask #2
0.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2404 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 7 ms 2396 KB Output is correct
4 Correct 7 ms 2396 KB Output is correct
5 Correct 17 ms 2396 KB Output is correct
6 Correct 78 ms 2824 KB Output is correct
7 Correct 82 ms 2652 KB Output is correct
8 Correct 1483 ms 2812 KB Output is correct
9 Execution timed out 1541 ms 2652 KB Time limit exceeded
10 Halted 0 ms 0 KB -

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2404 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 7 ms 2396 KB Output is correct
4 Correct 7 ms 2396 KB Output is correct
5 Correct 17 ms 2396 KB Output is correct
6 Correct 78 ms 2824 KB Output is correct
7 Correct 82 ms 2652 KB Output is correct
8 Correct 1483 ms 2812 KB Output is correct
9 Execution timed out 1541 ms 2652 KB Time limit exceeded
10 Halted 0 ms 0 KB -