Submission #945379

#	Time	Username	Problem	Language	Result	Execution time	Memory
945379		yeediot	Necklace (Subtask 4) (BOI19_necklace4)	C++14	0 / 15	167 ms	600 KiB

necklace

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef local
void setio(){freopen("/Users/iantsai/Library/Mobile Documents/com~apple~CloudDocs/cpp/Empty.md","r",stdin);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
struct line{
    int a,b;
    int operator()(const int x)const{
        return a*x+b;
    }
};
bool check(line l1,line l2,line l3){
    return (l3.b-l2.b)*(l1.a-l2.a)<=(l2.b-l1.b)*(l2.a-l3.a);
}
vector<int> kmp(string s){
    vector<int>res(sz(s));
    for(int i=1,j=0;i<sz(s);i++){
        while(j and s[i]!=s[j])j=res[j-1];
        if(s[i]==s[j])j++;
        res[i]=j;
    }
    return res;
}
signed main(){
    setio();
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    string s,t;
    cin>>s>>t;
    int n=sz(s),m=sz(t);
    tuple<int,int,int>ans={0,0,0};
    for(int i=0;i<n;i++){
        string s1=s.substr(0,i),s2=s.substr(i,n-i);
        reverse(all(s1));
        string t1=t,t2=t;
        reverse(all(t2));
        vector<int>p1=kmp(s1+'#'+t1),p2=kmp(s2+'#'+t2);
        for(int j=0;j<m;j++){
            int x=p2[j+sz(s2)+1],y=p1[m-j-1+sz(s1)];
            debug(j,x,y);
            ans=max(ans,{x+y,i-x,j-x+1});
        }
    }
    reverse(all(t));
    for(int i=0;i<n;i++){
        string s1=s.substr(0,i),s2=s.substr(i,n-i);
        reverse(all(s1));
        string t1=t,t2=t;
        reverse(all(t2));
        vector<int>p1=kmp(s1+'#'+t1),p2=kmp(s2+'#'+t2);
        for(int j=0;j<m;j++){
            int x=p2[j+sz(s2)+1],y=p1[m-j-1+sz(s1)];
            debug(i,j,x,y);
            ans=max(ans,{x+y,i-y,m-(j+y)-1});
        }
    }
    cout<<get<0>(ans)<<'\n'<<get<1>(ans)<<' '<<get<2>(ans)<<'\n';
}
 /*
 input:
 zxyabcd
 ztcdabxy
 */















 

Compilation message (stderr)

necklace.cpp: In function 'void setIO(std::string)':
necklace.cpp:42:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
necklace.cpp:43:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15