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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#413399#8668. 回文路径zhao_daodao100 ✓50ms10984kbC++141.9kb2024-05-17 14:40:412024-05-17 14:40:41

Judging History

你现在查看的是最新测评结果

  • [2024-05-17 14:40:41]
  • 评测
  • 测评结果:100
  • 用时:50ms
  • 内存:10984kb
  • [2024-05-17 14:40:41]
  • 提交

answer

#include<bits/stdc++.h>
#define int long long
#define ull unsigned long long
using namespace std;
const int MAXN=2e5+5;
const ull Base=547;
int n;
ull fac[MAXN];
struct String{
    string S;
    ull S1[MAXN],S2[MAXN];
    inline void init(){
        for(int i=1;i<=n;i++)S1[i]=S1[i-1]*Base+(S[i]-'A');
        for(int i=n;i>=1;i--)S2[i]=S2[i+1]*Base+(S[i]-'A');
    }
    inline ull hash1(int l,int r){return S1[r]-S1[l-1]*fac[r-l+1];}
    inline ull hash2(int l,int r){return S2[l]-S2[r+1]*fac[r-l+1];}
    inline bool huiwen(int l,int r){return hash1(l,r)==hash2(l,r);}
}s,t;
inline bool check(int L,int R){
    if(s.S[L]!=t.S[R])return 0;
    int l=1,r=R-L+1;
    while(l<r){
        int mid=l+r+1>>1;
        if(s.hash1(L,L+mid-1)==t.hash2(R-mid+1,R))l=mid;
        else r=mid-1;
    }
    if(l>(R-L+1)/2)return 1;
    return s.huiwen(L+l,R-l+1)||t.huiwen(L+l-1,R-l);
}
inline bool check(int len){
    if(len<=n){
        for(int l=1;l<=n-len+1;l++){
            int r=l+len-1;
            if(s.huiwen(l,r)||t.huiwen(l,r))return 1;
        }
    }
    for(int l=1;l<=n-len+2;l++){
        int r=l+len-2;
        if(check(l,r))return 1;
    }
    return 0;
}
int ans=0;
inline int solve1(){
    int l=0,r=n/2;
    while(l<r){
        int mid=l+r+1>>1;
        if(check(mid<<1|1))l=mid;
        else r=mid-1;
    }
    return l<<1|1;
}
inline int solve2(){
    int l=2,r;
    if((n+1)&1)r=n/2;else r=(n+1)/2;
    while(l<r){
        int mid=l+r+1>>1;
        if(check(mid<<1))l=mid;
        else r=mid-1;
    }
    return l<<1;
}
signed main(){
    cin.tie(0);
    cout.tie(0);
    ios::sync_with_stdio(false);
    cin>>n>>s.S>>t.S;
    s.S=" "+s.S;
    t.S=" "+t.S;
    fac[0]=1;for(int i=1;i<=n;i++)fac[i]=fac[i-1]*Base;
    s.init();t.init();
    ans=max(ans,solve1());
    ans=max(ans,solve2());
    cout<<ans<<"\n";
}

详细

Subtask #1:

score: 30
Accepted

Test #1:

score: 30
Accepted
time: 1ms
memory: 7736kb

input:

1000
mfmlkrasfiudkzrjzyrlbpitvzfrlmjdzsurtdcmnqpsyfgobbstvplqylvciloomaljyssxtrrccywyirfvlcnchwkfwbdaoxzpfpvlruptganojnfxmnlqetptmlmoyluxvaipghtlaszoozscdmjomobyzboqqmvqjpbfjsoczhkwrlcauzjceqikbaeuiqahnldpqmohfjfzgkbfdbqnoxispkejvpncwsyelebqumapgbfdrjvuaxaphnkciwzkruijmanwslkwosgyfhwbnsthhtxrhrzlgtt...

output:

6

result:

ok single line: '6'

Test #2:

score: 0
Accepted
time: 1ms
memory: 7908kb

input:

1000
wvitzoxwlmhexjuqvoxksetoupgkhattucdzfevqorkdlsymjuvhobdrjsodtipwpfhipsdnyvqtsbbasrrvyybijzmpwseckztnpnkqswgkaeivflhwevhxcchjsnelqcixexkntwiuolsditpdwypgerzijziyrgqkwuucnqaehuwkpyrmwewjitvsaebyytznbtnkulnepceeloyjpfhcdpqfqhvzsmkcynjwztmkbnqaxnikfuiutocahdfbvsgdskgwqmzizzjlbqxnngftdohetabpjzpqzyc...

output:

7

result:

ok single line: '7'

Test #3:

score: 0
Accepted
time: 1ms
memory: 5708kb

input:

1000
abababaabaababbbbabbbbabbbbbbabbbaabbbaababaabaabbabbbbaabbaabaaaabbaaabbbbaaaaaabbbbababaababbaabbbbbbbbabbaababbbbabbaabbbabaaababbaababbbaabaabaababaaababbaaaababbbbbaaabbaabbaaabbaaaaabaaaaaabbbbbaaabbbbbaabbbbababaabaabbbbaaaaababaaaababbbbbbaababbbaaaababaabaabaabaaaaaabbabbabbbbbbbbbbabb...

output:

28

result:

ok single line: '28'

Test #4:

score: 0
Accepted
time: 1ms
memory: 5860kb

input:

1000
ababbababababbaababaaabaabaababbaabbbabaababbaaababbabbbbaabbababbbababbabababbaabbbaababbabaaaaabbbbbaaaaaaaaabbbbaabbbaabbababaaabababbaaaabababbbaabaabbabbaabaaaaaaabaaabaaababaaaababbaaabaabbbbbbaabbabaaabaabbbbabbababbbaaaaabbabbaabbaabbaabaaabaaabbbbbaabaaaaaababbbbbabbbabbbabababbbbbabaa...

output:

27

result:

ok single line: '27'

Test #5:

score: 0
Accepted
time: 1ms
memory: 7604kb

input:

1000
abbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabba...

output:

987

result:

ok single line: '987'

Test #6:

score: 0
Accepted
time: 1ms
memory: 7948kb

input:

1000
aaaaaaababbabbabaabaaaaababaaaaaabaabaaaabaaaaaaabbbabaabbaaabaaaaaaabaaaaaaaabaaabbaababaaaaaaaaabbaabbabbaaaaabaaaaaaaabbaaabaaaaaaaaaaabaabbbbbaaaabaaaaaaaaabbbaaaaabaaabaaaaaaaaaaaaaababaaaaabbaabbaaaabaabaaaababaaaaaababaaaaabaaaaaaabaaaababaaaabbaaaabaaaaabaaaaaaaabaaaaaaabaaaaaaaaaaaabaa...

output:

45

result:

ok single line: '45'

Test #7:

score: 0
Accepted
time: 1ms
memory: 7716kb

input:

1000
aaaaaabaaaaaaaababaaaaaaababaaaabaabaaaaabaabaaaabbaaaaabaababaaaaaaaaaaabaaaabaaaaaaaaaaaaaaaaaabbaaaaaaababaabaaaabababaaaaabbaaaaaabbababaaabbaaababbaaaabbababaaaaaaaaabbbaaaababaaaaabaaaabbaabaaaaaabbaabaaaaaaaaaaabaaaababbaaaaaaaababbabaaaaaaaaabaaaabaaaaabaaaaaaaaaaaabaaaabaaababaabaabaab...

output:

45

result:

ok single line: '45'

Test #8:

score: 0
Accepted
time: 1ms
memory: 7652kb

input:

1000
aabaaaabaaaabaaabaabbbaabaabbbaaaaaaaaaabaaaaabaababaabaabaaaaaaaaaabbabbaaaaaaaabaabbbbbaaaabbabbbaaaaaabababbaaaabaaaaaaaaabaaaaaaaabaaaaaabbaaaaabaaaaaababaaababaaaabaaaaaabaaaaaaabaaaaabbaaaaabaababaaaabbaaabbaabaabaaaaababbababaaabbbabaabaaabaaabaababbabaababaaaaabaaababaaaaaaaaaabbaaaabaa...

output:

36

result:

ok single line: '36'

Test #9:

score: 0
Accepted
time: 1ms
memory: 7728kb

input:

1000
aaaaaabaabaaaaaaabaaaaaabaabaaaaaaaaabaabaaaaaaababaaaaabaaabaabaaabaaaaaaaaaaaaabbbbbabaaaaaaabaaaaabaaabaaaaabababaaabaaabaabaabaaaabbaabaaaaaaaaaaaaaaabbaaaaabaabbabbbaaabbbabaababbaabaaaabbaaaabaabbbaaaaaaaaaabaabaaaabbaaaabbbbaaabaaaaabaaababaaaaaaaaaabbabbabaaaaaaaaaaaaaaaabaababbaaaababa...

output:

50

result:

ok single line: '50'

Test #10:

score: 0
Accepted
time: 1ms
memory: 7668kb

input:

1000
aaccbdbabdaaddabaabaaaacbbccdbabbaacabcdababdcacadababaadaaaadabacababcdbaabaaaabdbabbdcaacccaaacababaacbcacaaabbabbaaabcbaaabaababbaaacbaacaaacabdccbbbaabaccacadbbcaabacadaababbaaabababbacaabbaaabcdaabaaaaaabaababaabcabacaabacaaaaaacaaabcbcabcbbcbbbaacaadadbadbbadcabababcabbcbbdadbdababaaadcab...

output:

20

result:

ok single line: '20'

Subtask #2:

score: 20
Accepted

Test #11:

score: 20
Accepted
time: 12ms
memory: 10784kb

input:

100000
ibhqhodaqcwqggmckoemulhkgbfidceskhefhsonccepfodalabaqgobpgcnaervbccadkbtsdigsoqochklocgbjjqcdhwrlacamprsoilyhiwkkjalicedhbxajrkhjgivjhnfdibkdwtexnnriegejazmohlfijbeigfmpngncokxhifjfuwuogccdfglfbxobnarmgfhgpnjjewicgfhcmfbbnjbbjjtbprnagpchcihcihfhcikeaecefdgeegtzlfdolhfieahiehdfcaflmndmcojceblf...

output:

9

result:

ok single line: '9'

Test #12:

score: 0
Accepted
time: 13ms
memory: 10708kb

input:

100000
fruiifpdggdnsbgamakpjipicaidfdjpffioqcwioaafbpdagmbbakqpekjabcljockpvcifilcjakhcboolgjbnmmrbeawcjopbccjgncdaucighprheiaqofriccfdbydbhijeelbthsmqbhcddlfemqkvdbflkdrifckarqwlaafifmqibssfukblchalkzdefnccaiabrhcrmisdeiqddccrqhiiwcqqakbfhebkiecahgdlibhgmegkfbuibcarcbajpdeboigeoctdljmqeckdfqahiecla...

output:

9

result:

ok single line: '9'

Test #13:

score: 0
Accepted
time: 12ms
memory: 8472kb

input:

99999
biwnbsgdlxognjnepijlgbfbbahicjfqhdhcielcovdflacbrgcfapifaylqfmvipcccoofthuutfheboncacenchdgfljpidjbasdsikduidkbdqckmlnbfaidlincqkccbbpmnqnpbjoclgeduitraqmdfgdqinhddgberlbnlgggoafgqllbifekoccpgemcgdiiackkcfjgddhieabhzdjfwegcbuncdadebglitgwcbpmclfijmqtbbnbbrcehhanjgbddiaoimmkehtloreemecckjejifck...

output:

11

result:

ok single line: '11'

Test #14:

score: 0
Accepted
time: 12ms
memory: 9352kb

input:

99999
chgjcjipccsmclcpjqmbrcpaqdggbdodxbcejbklpjhkefeidkjojjjbljhtykbcdgnnjeictgjgliegyfilmlkqkgddpefibjusamblbpqfbbvcfkgfagikbujlbjvenjbmcadceadnltdeksatckmkjkscojeqbpaaglggxhideqhkhibchdasadfggcoihhcwlphbeevohhohtthepedqfggbdglidnatocrkhnkijraddqbesaiajimdhdmvbgodlcglqqmkeehcfabeaatjdinzhijewfoxhh...

output:

9

result:

ok single line: '9'

Test #15:

score: 0
Accepted
time: 0ms
memory: 10844kb

input:

99999
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...

output:

99999

result:

ok single line: '99999'

Subtask #3:

score: 50
Accepted

Dependency #1:

100%
Accepted

Dependency #2:

100%
Accepted

Test #16:

score: 50
Accepted
time: 12ms
memory: 8444kb

input:

100000
vucutyzmjlnyadjbpqkrlqvzuponzxrvqsqqgbemhzjftdkksfgspeuonmjwlbirvszhcafcxpeubixvxetwyyqmftbobhodwaiwrcwdvddohalyqgaatvpflorvjypszbvzpwiaxxgievaozquixcndkxqfxcxaiygyqcgdebogwzquvqfljgjcvvhpirfzqlkwctibngdsffpormliyhrkcbxwxoaoovaawldfenziwnlahllzhjsvdhzekcqekayusmvzrgsdiiymjxfiddhawhgxathvnsedf...

output:

10

result:

ok single line: '10'

Test #17:

score: 0
Accepted
time: 8ms
memory: 10984kb

input:

100000
fotxrzsqxuaaiiqmiymhtfdipylgdmxizgzqrgbrmdemonbisusgbmmsgtyoaqgdmxwoxayxkszpvpypzjoapilopvhyiyhckcccaalqriunudgfifgvdiufjtukpsmdfjjzftszwizrwoxuqsujchtrywpiiineoscbvarbalizfyydbctxpuwndzgshavpygfcmxkorbcppbatauqqkumaqsjcupnihewaukjajqgdvatobxjgdcbevlxpkjdvpofwtctivkexpwnbwvwbhcmlivuvifpptiupy...

output:

9

result:

ok single line: '9'

Test #18:

score: 0
Accepted
time: 45ms
memory: 9328kb

input:

100000
baaabababbbaabbbbaabbabbababbbbbaaaaabaabbbbbbaaabaabaaabababbabbabbaababbaababbbabaaaaabbbabbabaaaabaabbbbababaaaaabbbbbabbbababbbbbaaabbaaabaabaaababbababbabaaaaaaaababaaabaababbbababbbbabbbabaaababbababbbababaabbaabbabaaaabaaabbbabbaabbabbbbbbabbbbaaaaaaaaaaabbbaabaaaabbbabbbaabababbbbaabb...

output:

40

result:

ok single line: '40'

Test #19:

score: 0
Accepted
time: 45ms
memory: 8484kb

input:

100000
babbbbaabaaaaaaaaaabbbbababababababababbabaaabbaaaaabaaaabaaaaababaabaabaabbbbabbbaabababbbaaabaaaaaaababaabababababbaabbbaabaabbbbbbbabaabbaabaaaababbbaabaaabaaaabbabbababbaabbabbbaabbbaababbaabaabaabbabbbabaaaaaaaaaabaabbabaaaaababaabbababbbabababbbbabbbbababababaabbabbababbaababababbbbaaba...

output:

43

result:

ok single line: '43'

Test #20:

score: 0
Accepted
time: 50ms
memory: 10720kb

input:

100000
aabaabbaaaaabbbbbaaaaaaaaaaaaaabbaaaaaaaaabaaaabbaaaaaabaaaaabaabbaaabababaaabbaaaaaaaaaabbabbbaaaaaaabaaabbbaabaaabaaabaaaaaaaaaabaabaaaababaaaaaabbaaaaaaababaabaaaaabababaaaaaaaaaababaaaababbaaabaaaabaaaaabaababbaaaaabbaaabaabaabaaaaababaaaaabbaaaabaaaaaaabaaaaaaaaabaabaaaaaabaababbbabaaaba...

output:

75

result:

ok single line: '75'

Test #21:

score: 0
Accepted
time: 48ms
memory: 10788kb

input:

100000
aaaabaabaaabaabbaaaabbbaaaaaaabaabaabaabaaaababaaaaabaaaaabbabaabbaabaaaaaabaaaaaaaaaaaaabaabbabaaaaaabaaaaaaaaaaaabaaaabbbabaaaaaabaaaababaaaabaaaaaabbaaaaaaaaabababaaaaabaabababaaabbababaaaaababababbaaaaaabaabaaaabbababbbaaabaaaabaabaaaaabaabaaaaaabbbaaaaaaabababababbaaabaaabaaababaaaabaaaa...

output:

58

result:

ok single line: '58'

Test #22:

score: 0
Accepted
time: 48ms
memory: 8436kb

input:

100000
abbaaaaaaabaaaaaaaabaaaaaaaaaaaaaaaaabbabaaabaaaaaaaaaaaaaaabaaabbbaabaaaaabaaaaaaabaaaaabaabaabaaaababaaaaaaaaaaaaaaaaabaaabbabaaaaaaabaaaaaaabaaaaaabaaaaabaaabbaaaabbaabbaaababaababaaaaaabaaaaabaaaaaaaaaaaaababaaaaabaaaaaabbbabaaaaaaaaaaaaabaaaaaaaabbbaabaaabaaabaaabbabaabaaabbabaaaaaaaabba...

output:

67

result:

ok single line: '67'

Test #23:

score: 0
Accepted
time: 50ms
memory: 10816kb

input:

100000
bbaaaaabaaaaaaaaaabbaabaaaaaaabbbaabababaaababbaaaabaaaaaaaaaabaaaabbaaaaabaaaaaabbaabbbbaaabbaaaaaabbabaaabaababbaababaaabaaaaaaaaaabaaaaabbaaaaabbaaaabaaabababbbaabaaaaabaabaaaaaaabaaaaaaabaabababbbaaaaaaaaaaaaaaaaabaaaaaaabaaaaaababbbababaabaaabbbaaaaabaaaaaaabaabababaaaaaabaaaabbaabababaa...

output:

55

result:

ok single line: '55'

Test #24:

score: 0
Accepted
time: 28ms
memory: 10548kb

input:

100000
cabcacbbacbbaacbaabbaabbaabacdcadbbccabbccbbaabacacbabaccbaabbbaaabaddbcaccdcaababaaabbbbbcdacaabababcbbcbcabbbdbbbcadaadabcabbacabbdbbcaaabacaabbabbabacbabbabaadabbabdbabcbdcaacaddbbbabdabaaabcabcababbcbbaaccabbbbacaabbacdaaaabaaaaccaaabaaccbaccbbababdacaacabcaaabbaaacbcbaaabcaaabcaabbabbcad...

output:

25

result:

ok single line: '25'

Test #25:

score: 0
Accepted
time: 7ms
memory: 10760kb

input:

100000
abbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbab...

output:

96421

result:

ok single line: '96421'

Test #26:

score: 0
Accepted
time: 1ms
memory: 7716kb

input:

5
pkusc
pkukp

output:

6

result:

ok single line: '6'