oj.uz

Submission #209632

# Submission time Handle Problem Language Result Execution time Memory
209632 2020-03-15T00:20:13 Z thebes Necklace (Subtask 1-3) (BOI19_necklace1) C++14
85 / 85
 242 ms 420 KB 
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>
#define DEBUG 1
using namespace std;

namespace output{
    void __(short x){cout<<x;}
    void __(unsigned x){cout<<x;}
    void __(int x){cout<<x;}
    void __(long long x){cout<<x;}
    void __(unsigned long long x){cout<<x;}
    void __(double x){cout<<x;}
    void __(long double x){cout<<x;}
    void __(char x){cout<<x;}
    void __(const char*x){cout<<x;}
    void __(const string&x){cout<<x;}
    void __(bool x){cout<<(x?"true":"false");}
    template<class S,class T>
    void __(const pair<S,T>&x){__(DEBUG?"(":""),__(x.first),__(DEBUG?", ":" "),__(x.second),__(DEBUG?")":"");}
    template<class T>
    void __(const vector<T>&x){__(DEBUG?"{":"");bool _=0;for(const auto&v:x)__(_?DEBUG?", ":" ":""),__(v),_=1;__(DEBUG?"}":"");}
    template<class T>
    void __(const set<T>&x){__(DEBUG?"{":"");bool _=0;for(const auto&v:x)__(_?DEBUG?", ":" ":""),__(v),_=1;__(DEBUG?"}":"");}
    template<class T>
    void __(const multiset<T>&x){__(DEBUG?"{":"");bool _=0;for(const auto&v:x)__(_?DEBUG?", ":" ":""),__(v),_=1;__(DEBUG?"}":"");}
    template<class S,class T>
    void __(const map<S,T>&x){__(DEBUG?"{":"");bool _=0;for(const auto&v:x)__(_?DEBUG?", ":" ":""),__(v),_=1;__(DEBUG?"}":"");}
    void pr(){cout<<"\n";}
    template<class S,class... T>
    void pr(const S&a,const T&...b){__(a);if(sizeof...(b))__(' ');pr(b...);}
}

using namespace output;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<int,char> pic;
typedef pair<double,double> pdd;
typedef pair<ld,ld> pld;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int,vi> piv;

#define pb push_back
#define fox(i,x,y) for(int i=(x);i<=(y);i++)
#define foxr(i,x,y) for(int i=(y);i>=(x);i--)

const int MN = 3003;
string s, t;
int n, m, i, j, pre[MN], suf[MN], st[MN], lim1, lim2, ans, sw, fl, k, f[MN];
pii sna;

void solve(){
    k = lim2;
    for(int i=2,j=1;i<=k;i++){
        while(j&&t[m-i]!=t[m-j]) j=f[j-1];
        f[i]=j++;
    }
    f[0]=-1;
    int ln = 0;
    for(int i=n;i>=1;i--){
        while(ln>=0&&(ln>k||t[m-ln-1]!=s[i-1])) ln=f[ln];
        suf[i]=++ln;
        ln=min(ln,k);
        st[i]=max(0,k-suf[i]);
    }
    k = lim1;
    for(int i=2,j=1;i<=k;i++){
        while(j&&t[i-1]!=t[j-1]) j=f[j-1];
        f[i]=j++;
    }
    ln = 0;
    for(int i=1;i<=n;i++){
        while(ln>=0&&(ln>k||t[ln]!=s[i-1])) ln=f[ln];
        pre[i]=++ln;
        ln=min(ln,k);
        if(pre[i]+suf[i+1]>ans){
            ans = pre[i]+suf[i+1];
            if(sw) sna = {n-(i+suf[i+1]), st[i+1]};
            else sna = {i-pre[i], st[i+1]};
        }
    }
}

int main(){
    cin >> s >> t;
    n = s.size(), m = t.size();
    lim1 = 0; lim2 = m;
    solve();
    for(int i=1;i<=m;i++){
        lim1++; lim2--;
        char ch = t.back(); t.erase(t.end()-1);
        t.insert(t.begin(),ch);
        solve();
    }
    reverse(s.begin(),s.end());
    lim1 = 0; lim2 = m; sw = 1;
    solve();
    for(int i=1;i<=m;i++){
        lim1++; lim2--;
        char ch = t.back(); t.erase(t.end()-1);
        t.insert(t.begin(),ch);
        solve();
    }
    printf("%d\n%d %d\n",ans,sna.first,sna.second);
    return 0;
}

Compilation message

necklace.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("O3")
 
necklace.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("unroll-loops")

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 9 ms 376 KB Output is correct
7 Correct 9 ms 376 KB Output is correct
8 Correct 8 ms 376 KB Output is correct
9 Correct 8 ms 376 KB Output is correct
10 Correct 9 ms 376 KB Output is correct
11 Correct 9 ms 376 KB Output is correct
12 Correct 9 ms 380 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 9 ms 376 KB Output is correct
7 Correct 9 ms 376 KB Output is correct
8 Correct 8 ms 376 KB Output is correct
9 Correct 8 ms 376 KB Output is correct
10 Correct 9 ms 376 KB Output is correct
11 Correct 9 ms 376 KB Output is correct
12 Correct 9 ms 380 KB Output is correct
13 Correct 234 ms 416 KB Output is correct
14 Correct 188 ms 376 KB Output is correct
15 Correct 208 ms 376 KB Output is correct
16 Correct 177 ms 376 KB Output is correct
17 Correct 237 ms 376 KB Output is correct
18 Correct 242 ms 376 KB Output is correct
19 Correct 205 ms 376 KB Output is correct
20 Correct 207 ms 376 KB Output is correct
21 Correct 212 ms 420 KB Output is correct