oj.uz

Submission #141442

# Submission time Handle Problem Language Result Execution time Memory
141442 2019-08-08T05:56:10 Z 12tqian Palindromic Partitions (CEOI17_palindromic) C++14
100 / 100
 437 ms 36724 KB 
#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#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;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
 
const double PI = 4 * atan(1);
 
#define sz(x) (int)(x).size()
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define vi vector<int>
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define vpi vector<pair<int, int>>
#define vpd vector<pair<double, double>>
#define pd pair<double, double>
 
#define f0r(i,a) for(int i=0;i<a;i++)
#define f1r(i,a,b) for(int i=a;i<b;i++)
#define trav(a, x) for (auto& a : x)
 
void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
}
void io(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
    fast_io();
}
 
const ll MOD = 1e9 +7;
const ll BASE = 131;
long long modInverse(long long b){
    long long ex = MOD - 2;
    if (b==1){
        return 1;
    }
    long long r = 1;
    while (ex ){
        if (ex&1){
            r=(r * b)%MOD;
        }
        ex = ex >> 1;
        b = (b * b)%MOD;
    }
    return r;
}
struct hsh {
    vector<ll> pre;
    int sz;
    ll INV;
    vector<ll> inv;
    vector<ll> po;
    void init(string s){
        sz = sz(s);
        pre.resize(sz);
        inv.resize(sz + 5);
        po.resize(sz + 5);
        INV = modInverse(BASE);
        f0r(i, sz(inv)){
            if(i == 0) inv[i] = 1;
            else inv[i] = (inv[i-1]*INV)%MOD;
        }
        f0r(i, sz(po)){
            if(i == 0) po[i] = 1;
            else po[i] = (po[i-1]*BASE)%MOD;
        }
        f0r(i, sz){
            if(i == 0) pre[i] =  (s[i] - 'a')*po[i];
            else pre[i] = pre[i-1] + (s[i] - 'a')*po[i];
        }
    }
    ll get(int l, int r){
        ll ret = (pre[r] - (l == 0? 0: pre[l-1]))%MOD;
        ret *= inv[l];
        ret %= MOD;
        return ret;
    }
};
 
 
int solve(string s){
    int n = sz(s);
    int lo = 0;
    int hi = n-1;
    int l = lo;
    int r = hi;
    int ret = 0;
    hsh h;
    h.init(s);
    //bonobo
    while(true){
    	if(lo>hi) break;
        if(l >= r){
            ret++;
            break;
        }
        if(h.get(lo, l) == h.get(r, hi)){
            ret += 2;
            lo = l;
            hi = r;
            lo++;
            hi--;
            l = lo;
            r = hi;
        }
        else{
            l++;
            r--;
        }
    }
    return ret;
}
int main(){
    fast_io();
    int t;
    cin >> t;
    string temporary;
    getline(cin, temporary);
    f0r(i, t){
        string s;
        getline(cin, s);
        cout << solve(s) << endl;
    }
    return 0;
}

Compilation message

palindromic.cpp:1:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/stack:200000000")
 
palindromic.cpp: In function 'void io(std::__cxx11::string)':
palindromic.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FIN, "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~
palindromic.cpp:48:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FOUT, "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 6 ms 788 KB Output is correct
11 Correct 4 ms 644 KB Output is correct
12 Correct 6 ms 736 KB Output is correct
13 Correct 6 ms 728 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 6 ms 788 KB Output is correct
11 Correct 4 ms 644 KB Output is correct
12 Correct 6 ms 736 KB Output is correct
13 Correct 6 ms 728 KB Output is correct
14 Correct 430 ms 36724 KB Output is correct
15 Correct 240 ms 31600 KB Output is correct
16 Correct 437 ms 34656 KB Output is correct
17 Correct 214 ms 19796 KB Output is correct