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QOJ
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_daodao | 100 ✓ | 50ms | 10984kb | C++14 | 1.9kb | 2024-05-17 14:40:41 | 2024-05-17 14:40:41 |
Judging History
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'