제출 #156439

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
156439		jh05013	원형 문자열 (IZhO13_rowords)	C++17	100 / 100	195 ms	548 KiB

rowords

#include <bits/stdc++.h>
#define entire(X) X.begin(),X.end()
using namespace std; typedef long long ll;
void OJize(){cin.tie(NULL); ios_base::sync_with_stdio(false);}
template <class T1, class T2>ostream&operator<<(ostream &os,pair<T1,T2>const&x){os<<'('<<x.first<<", "<<x.second<<')';return os;}
template <class Ch, class Tr, class Container>basic_ostream<Ch,Tr>&operator<<(basic_ostream<Ch,Tr>&os,Container const&x){for(auto&y:x)os<<y<<" ";return os;}

#define GET(arr, x) (((arr[x >> 6] >> (x & 63)) & 1) == 1)
#define SET(arr, x) (arr[x >> 6] |= 1llu << (x & 63))
typedef unsigned long long ull;
int lcs(string A, string B){
    int N = A.size(), M = B.size(), sz = (M>>6)+1;
    vector<vector<ull>> S(256, vector<ull>(sz));
    for(int j=0; j<M; j++) SET(S[B[j]], j);
    vector<ull> row(sz);
    for(int j=0; j<M; j++) if(A[0] == B[j]){SET(row, j); break;}
    for(int i=1; i<N; i++){
        ull shl_carry = 1, minus_carry = 0;
        for(int k=0; k<sz; k++){
            ull x_k = S[A[i]][k] | row[k];
            ull term_1 = (row[k] << 1) | shl_carry;
            shl_carry = row[k] >> 63;
            auto sub_carry = [](ull &x, ull y){
                ull tmp = x; return (x = tmp-y) > tmp;
            };
            ull term_2 = x_k;
            minus_carry = sub_carry(term_2, minus_carry);
            minus_carry += sub_carry(term_2, term_1);
            row[k] = x_k & (x_k ^ term_2);
        }
        row[M >> 6]&= (1llu << (M & 63)) - 1;
    }
    int ret = 0;
    for(int j=0; j<M; j++) if(GET(row, j)) ret++;
    return ret;
}

int main(){OJize();
    string A, B; cin>>A>>B;
    int ans = 0;
    for(int i=0; i<B.size(); i++){
        rotate(B.begin(), B.begin()+1, B.end());
        ans = max(ans, lcs(A, B));
    }
    reverse(entire(B));
    for(int i=0; i<B.size(); i++){
        rotate(B.begin(), B.begin()+1, B.end());
        ans = max(ans, lcs(A, B));
    }
    cout<<ans;
}

컴파일 시 표준 에러 (stderr) 메시지

rowords.cpp: In function 'int main()':
rowords.cpp:41:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<B.size(); i++){
                  ~^~~~~~~~~
rowords.cpp:46:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<B.size(); i++){
                  ~^~~~~~~~~

• Subtask 1: 100 / 100