Submission #229776

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
229776	2020-05-06 10:35:03	tatyam	Palindromes (APIO14_palindrome)	C++17	100 / 100	303 ms	23760 KiB

palindrome

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#include <bits/stdc++.h>
using namespace std;
using ull = uint64_t;
using u128 = __uint128_t;
using pii = pair<int, int>;
template<class T, class U> bool chmax(T& a, const U& b){ if(a < b){ a = b; return 1; } return 0; }
constexpr ull mod = 0x1fffffffffffffff, base = 257;
struct RollingHash{
    const int n;
    vector<ull> data, power;
    static constexpr ull mul(ull a, ull b){
        u128 c = (u128)a * b;
        ull ans = ull(c >> 61) + ull(c & mod);
        if(ans >= mod) ans -= mod;
        return ans;
    }
    RollingHash(const string& s): n(s.size()), data(n + 1), power(n + 1){
        power[0] = 1;
        data[0] = 1;
        for(int i = 0; i < n; i++){
            power[i + 1] = mul(power[i], base);
            data[i + 1] = mul(data[i], base) + s[i];
            if(data[i + 1] >= mod) data[i + 1] -= mod;
        }
    }
    ull get(int l, int r){
        const ull L = mul(data[l], power[r - l]);
        const ull R = data[r];
        return R - L + (R < L ? mod : 0);
 
 
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Compilation message (stderr)

palindrome.cpp: In function 'std::vector<int> manacher(const string&)':
palindrome.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 1; i < S.size(); i++){
                    ~~^~~~~~~~~~
palindrome.cpp: In function 'int main()':
palindrome.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < a.size(); i++){
                    ~~^~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 24 / 24
• Subtask 4: 26 / 26
• Subtask 5: 27 / 27