QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #557243 | #8668. 回文路径 | Sai_tqwq | 100 ✓ | 63ms | 7792kb | C++14 | 2.5kb | 2024-09-11 08:22:22 | 2024-09-11 08:22:22 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define double long double
#define endl '\n'
const int mod=998244353,bas=37;
int n,ans,h1[100009],h2[100009],p1[100009],p2[100009],pw[100009];
char s[100009],t[100009];
signed main(){
ios::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
cin>>n>>(s+1)>>(t+1);
pw[0]=1;for(int i=1;i<=n;i++)pw[i]=pw[i-1]*bas%mod;
for(int i=1;i<=n;i++)h1[i]=(h1[i-1]*bas+(s[i]-'a'+1))%mod;
for(int i=n;i;i--)h2[i]=(h2[i+1]*bas+(s[i]-'a'+1))%mod;
for(int i=1;i<=n;i++)p1[i]=(p1[i-1]*bas+(t[i]-'a'+1))%mod;
for(int i=n;i;i--)p2[i]=(p2[i+1]*bas+(t[i]-'a'+1))%mod;
for(int i=1;i<=n;i++){
int l=1,r=min(i,n-i+1);
while(r>l){
int mid=l+r+1>>1;
int x=(h1[i]-h1[i-mid]*pw[mid]%mod+mod)%mod;
int y=(h2[i]-h2[i+mid]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
int L=i-l,R=i+l-1;l=0,r=min(L,n-R+1);
while(r>l){
int mid=l+r+1>>1;
int x=(h1[L]-h1[L-mid]*pw[mid]%mod+mod)%mod;
int y=(p2[R]-p2[R+mid]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
ans=max(ans,(i-(L-l))*2-1);
}
for(int i=1;i<n;i++){
int l=0,r=min(i,n-i);
while(r>l){
int mid=l+r+1>>1;
int x=(h1[i]-h1[i-mid]*pw[mid]%mod+mod)%mod;
int y=(h2[i+1]-h2[i+mid+1]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
int L=i-l,R=i+l;l=0,r=min(L,n-R+1);
while(r>l){
int mid=l+r+1>>1;
int x=(h1[L]-h1[L-mid]*pw[mid]%mod+mod)%mod;
int y=(p2[R]-p2[R+mid]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
ans=max(ans,(i-(L-l))*2);
}
for(int i=1;i<=n;i++){
int l=1,r=min(i,n-i+1);
while(r>l){
int mid=l+r+1>>1;
int x=(p1[i]-p1[i-mid]*pw[mid]%mod+mod)%mod;
int y=(p2[i]-p2[i+mid]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
int L=i-l+1,R=i+l;l=0,r=min(L,n-R+1);
while(r>l){
int mid=l+r+1>>1;
int x=(h1[L]-h1[L-mid]*pw[mid]%mod+mod)%mod;
int y=(p2[R]-p2[R+mid]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
ans=max(ans,((R+l)-i)*2-1);
}
for(int i=1;i<n;i++){
int l=0,r=min(i,n-i);
while(r>l){
int mid=l+r+1>>1;
int x=(p1[i]-p1[i-mid]*pw[mid]%mod+mod)%mod;
int y=(p2[i+1]-p2[i+mid+1]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
int L=i-l+1,R=i+l+1;l=0,r=min(L,n-R+1);
while(r>l){
int mid=l+r+1>>1;
int x=(h1[L]-h1[L-mid]*pw[mid]%mod+mod)%mod;
int y=(p2[R]-p2[R+mid]*pw[mid]%mod+mod)%mod;
if(x==y)l=mid;
else r=mid-1;
}
ans=max(ans,((R+l)-i-1)*2);
}
cout<<ans<<endl;
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 30
Accepted
Test #1:
score: 30
Accepted
time: 1ms
memory: 3692kb
input:
1000 mfmlkrasfiudkzrjzyrlbpitvzfrlmjdzsurtdcmnqpsyfgobbstvplqylvciloomaljyssxtrrccywyirfvlcnchwkfwbdaoxzpfpvlruptganojnfxmnlqetptmlmoyluxvaipghtlaszoozscdmjomobyzboqqmvqjpbfjsoczhkwrlcauzjceqikbaeuiqahnldpqmohfjfzgkbfdbqnoxispkejvpncwsyelebqumapgbfdrjvuaxaphnkciwzkruijmanwslkwosgyfhwbnsthhtxrhrzlgtt...
output:
6
result:
ok single line: '6'
Test #2:
score: 30
Accepted
time: 0ms
memory: 3732kb
input:
1000 wvitzoxwlmhexjuqvoxksetoupgkhattucdzfevqorkdlsymjuvhobdrjsodtipwpfhipsdnyvqtsbbasrrvyybijzmpwseckztnpnkqswgkaeivflhwevhxcchjsnelqcixexkntwiuolsditpdwypgerzijziyrgqkwuucnqaehuwkpyrmwewjitvsaebyytznbtnkulnepceeloyjpfhcdpqfqhvzsmkcynjwztmkbnqaxnikfuiutocahdfbvsgdskgwqmzizzjlbqxnngftdohetabpjzpqzyc...
output:
7
result:
ok single line: '7'
Test #3:
score: 30
Accepted
time: 1ms
memory: 5756kb
input:
1000 abababaabaababbbbabbbbabbbbbbabbbaabbbaababaabaabbabbbbaabbaabaaaabbaaabbbbaaaaaabbbbababaababbaabbbbbbbbabbaababbbbabbaabbbabaaababbaababbbaabaabaababaaababbaaaababbbbbaaabbaabbaaabbaaaaabaaaaaabbbbbaaabbbbbaabbbbababaabaabbbbaaaaababaaaababbbbbbaababbbaaaababaabaabaabaaaaaabbabbabbbbbbbbbbabb...
output:
28
result:
ok single line: '28'
Test #4:
score: 30
Accepted
time: 0ms
memory: 3724kb
input:
1000 ababbababababbaababaaabaabaababbaabbbabaababbaaababbabbbbaabbababbbababbabababbaabbbaababbabaaaaabbbbbaaaaaaaaabbbbaabbbaabbababaaabababbaaaabababbbaabaabbabbaabaaaaaaabaaabaaababaaaababbaaabaabbbbbbaabbabaaabaabbbbabbababbbaaaaabbabbaabbaabbaabaaabaaabbbbbaabaaaaaababbbbbabbbabbbabababbbbbabaa...
output:
27
result:
ok single line: '27'
Test #5:
score: 30
Accepted
time: 1ms
memory: 3692kb
input:
1000 abbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabba...
output:
987
result:
ok single line: '987'
Test #6:
score: 30
Accepted
time: 1ms
memory: 3612kb
input:
1000 aaaaaaababbabbabaabaaaaababaaaaaabaabaaaabaaaaaaabbbabaabbaaabaaaaaaabaaaaaaaabaaabbaababaaaaaaaaabbaabbabbaaaaabaaaaaaaabbaaabaaaaaaaaaaabaabbbbbaaaabaaaaaaaaabbbaaaaabaaabaaaaaaaaaaaaaababaaaaabbaabbaaaabaabaaaababaaaaaababaaaaabaaaaaaabaaaababaaaabbaaaabaaaaabaaaaaaaabaaaaaaabaaaaaaaaaaaabaa...
output:
45
result:
ok single line: '45'
Test #7:
score: 30
Accepted
time: 1ms
memory: 3692kb
input:
1000 aaaaaabaaaaaaaababaaaaaaababaaaabaabaaaaabaabaaaabbaaaaabaababaaaaaaaaaaabaaaabaaaaaaaaaaaaaaaaaabbaaaaaaababaabaaaabababaaaaabbaaaaaabbababaaabbaaababbaaaabbababaaaaaaaaabbbaaaababaaaaabaaaabbaabaaaaaabbaabaaaaaaaaaaabaaaababbaaaaaaaababbabaaaaaaaaabaaaabaaaaabaaaaaaaaaaaabaaaabaaababaabaabaab...
output:
45
result:
ok single line: '45'
Test #8:
score: 30
Accepted
time: 0ms
memory: 3768kb
input:
1000 aabaaaabaaaabaaabaabbbaabaabbbaaaaaaaaaabaaaaabaababaabaabaaaaaaaaaabbabbaaaaaaaabaabbbbbaaaabbabbbaaaaaabababbaaaabaaaaaaaaabaaaaaaaabaaaaaabbaaaaabaaaaaababaaababaaaabaaaaaabaaaaaaabaaaaabbaaaaabaababaaaabbaaabbaabaabaaaaababbababaaabbbabaabaaabaaabaababbabaababaaaaabaaababaaaaaaaaaabbaaaabaa...
output:
36
result:
ok single line: '36'
Test #9:
score: 30
Accepted
time: 0ms
memory: 3620kb
input:
1000 aaaaaabaabaaaaaaabaaaaaabaabaaaaaaaaabaabaaaaaaababaaaaabaaabaabaaabaaaaaaaaaaaaabbbbbabaaaaaaabaaaaabaaabaaaaabababaaabaaabaabaabaaaabbaabaaaaaaaaaaaaaaabbaaaaabaabbabbbaaabbbabaababbaabaaaabbaaaabaabbbaaaaaaaaaabaabaaaabbaaaabbbbaaabaaaaabaaababaaaaaaaaaabbabbabaaaaaaaaaaaaaaaabaababbaaaababa...
output:
50
result:
ok single line: '50'
Test #10:
score: 30
Accepted
time: 1ms
memory: 3748kb
input:
1000 aaccbdbabdaaddabaabaaaacbbccdbabbaacabcdababdcacadababaadaaaadabacababcdbaabaaaabdbabbdcaacccaaacababaacbcacaaabbabbaaabcbaaabaababbaaacbaacaaacabdccbbbaabaccacadbbcaabacadaababbaaabababbacaabbaaabcdaabaaaaaabaababaabcabacaabacaaaaaacaaabcbcabcbbcbbbaacaadadbadbbadcabababcabbcbbdadbdababaaadcab...
output:
20
result:
ok single line: '20'
Subtask #2:
score: 20
Accepted
Test #11:
score: 20
Accepted
time: 55ms
memory: 7792kb
input:
100000 ibhqhodaqcwqggmckoemulhkgbfidceskhefhsonccepfodalabaqgobpgcnaervbccadkbtsdigsoqochklocgbjjqcdhwrlacamprsoilyhiwkkjalicedhbxajrkhjgivjhnfdibkdwtexnnriegejazmohlfijbeigfmpngncokxhifjfuwuogccdfglfbxobnarmgfhgpnjjewicgfhcmfbbnjbbjjtbprnagpchcihcihfhcikeaecefdgeegtzlfdolhfieahiehdfcaflmndmcojceblf...
output:
9
result:
ok single line: '9'
Test #12:
score: 20
Accepted
time: 55ms
memory: 7764kb
input:
100000 fruiifpdggdnsbgamakpjipicaidfdjpffioqcwioaafbpdagmbbakqpekjabcljockpvcifilcjakhcboolgjbnmmrbeawcjopbccjgncdaucighprheiaqofriccfdbydbhijeelbthsmqbhcddlfemqkvdbflkdrifckarqwlaafifmqibssfukblchalkzdefnccaiabrhcrmisdeiqddccrqhiiwcqqakbfhebkiecahgdlibhgmegkfbuibcarcbajpdeboigeoctdljmqeckdfqahiecla...
output:
9
result:
ok single line: '9'
Test #13:
score: 20
Accepted
time: 51ms
memory: 7748kb
input:
99999 biwnbsgdlxognjnepijlgbfbbahicjfqhdhcielcovdflacbrgcfapifaylqfmvipcccoofthuutfheboncacenchdgfljpidjbasdsikduidkbdqckmlnbfaidlincqkccbbpmnqnpbjoclgeduitraqmdfgdqinhddgberlbnlgggoafgqllbifekoccpgemcgdiiackkcfjgddhieabhzdjfwegcbuncdadebglitgwcbpmclfijmqtbbnbbrcehhanjgbddiaoimmkehtloreemecckjejifck...
output:
11
result:
ok single line: '11'
Test #14:
score: 20
Accepted
time: 55ms
memory: 7764kb
input:
99999 chgjcjipccsmclcpjqmbrcpaqdggbdodxbcejbklpjhkefeidkjojjjbljhtykbcdgnnjeictgjgliegyfilmlkqkgddpefibjusamblbpqfbbvcfkgfagikbujlbjvenjbmcadceadnltdeksatckmkjkscojeqbpaaglggxhideqhkhibchdasadfggcoihhcwlphbeevohhohtthepedqfggbdglidnatocrkhnkijraddqbesaiajimdhdmvbgodlcglqqmkeehcfabeaatjdinzhijewfoxhh...
output:
9
result:
ok single line: '9'
Test #15:
score: 20
Accepted
time: 44ms
memory: 7716kb
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: 52ms
memory: 7748kb
input:
100000 vucutyzmjlnyadjbpqkrlqvzuponzxrvqsqqgbemhzjftdkksfgspeuonmjwlbirvszhcafcxpeubixvxetwyyqmftbobhodwaiwrcwdvddohalyqgaatvpflorvjypszbvzpwiaxxgievaozquixcndkxqfxcxaiygyqcgdebogwzquvqfljgjcvvhpirfzqlkwctibngdsffpormliyhrkcbxwxoaoovaawldfenziwnlahllzhjsvdhzekcqekayusmvzrgsdiiymjxfiddhawhgxathvnsedf...
output:
10
result:
ok single line: '10'
Test #17:
score: 50
Accepted
time: 56ms
memory: 7620kb
input:
100000 fotxrzsqxuaaiiqmiymhtfdipylgdmxizgzqrgbrmdemonbisusgbmmsgtyoaqgdmxwoxayxkszpvpypzjoapilopvhyiyhckcccaalqriunudgfifgvdiufjtukpsmdfjjzftszwizrwoxuqsujchtrywpiiineoscbvarbalizfyydbctxpuwndzgshavpygfcmxkorbcppbatauqqkumaqsjcupnihewaukjajqgdvatobxjgdcbevlxpkjdvpofwtctivkexpwnbwvwbhcmlivuvifpptiupy...
output:
9
result:
ok single line: '9'
Test #18:
score: 50
Accepted
time: 58ms
memory: 7744kb
input:
100000 baaabababbbaabbbbaabbabbababbbbbaaaaabaabbbbbbaaabaabaaabababbabbabbaababbaababbbabaaaaabbbabbabaaaabaabbbbababaaaaabbbbbabbbababbbbbaaabbaaabaabaaababbababbabaaaaaaaababaaabaababbbababbbbabbbabaaababbababbbababaabbaabbabaaaabaaabbbabbaabbabbbbbbabbbbaaaaaaaaaaabbbaabaaaabbbabbbaabababbbbaabb...
output:
40
result:
ok single line: '40'
Test #19:
score: 50
Accepted
time: 57ms
memory: 7740kb
input:
100000 babbbbaabaaaaaaaaaabbbbababababababababbabaaabbaaaaabaaaabaaaaababaabaabaabbbbabbbaabababbbaaabaaaaaaababaabababababbaabbbaabaabbbbbbbabaabbaabaaaababbbaabaaabaaaabbabbababbaabbabbbaabbbaababbaabaabaabbabbbabaaaaaaaaaabaabbabaaaaababaabbababbbabababbbbabbbbababababaabbabbababbaababababbbbaaba...
output:
43
result:
ok single line: '43'
Test #20:
score: 50
Accepted
time: 59ms
memory: 7792kb
input:
100000 aabaabbaaaaabbbbbaaaaaaaaaaaaaabbaaaaaaaaabaaaabbaaaaaabaaaaabaabbaaabababaaabbaaaaaaaaaabbabbbaaaaaaabaaabbbaabaaabaaabaaaaaaaaaabaabaaaababaaaaaabbaaaaaaababaabaaaaabababaaaaaaaaaababaaaababbaaabaaaabaaaaabaababbaaaaabbaaabaabaabaaaaababaaaaabbaaaabaaaaaaabaaaaaaaaabaabaaaaaabaababbbabaaaba...
output:
75
result:
ok single line: '75'
Test #21:
score: 50
Accepted
time: 59ms
memory: 7732kb
input:
100000 aaaabaabaaabaabbaaaabbbaaaaaaabaabaabaabaaaababaaaaabaaaaabbabaabbaabaaaaaabaaaaaaaaaaaaabaabbabaaaaaabaaaaaaaaaaaabaaaabbbabaaaaaabaaaababaaaabaaaaaabbaaaaaaaaabababaaaaabaabababaaabbababaaaaababababbaaaaaabaabaaaabbababbbaaabaaaabaabaaaaabaabaaaaaabbbaaaaaaabababababbaaabaaabaaababaaaabaaaa...
output:
58
result:
ok single line: '58'
Test #22:
score: 50
Accepted
time: 63ms
memory: 7732kb
input:
100000 abbaaaaaaabaaaaaaaabaaaaaaaaaaaaaaaaabbabaaabaaaaaaaaaaaaaaabaaabbbaabaaaaabaaaaaaabaaaaabaabaabaaaababaaaaaaaaaaaaaaaaabaaabbabaaaaaaabaaaaaaabaaaaaabaaaaabaaabbaaaabbaabbaaababaababaaaaaabaaaaabaaaaaaaaaaaaababaaaaabaaaaaabbbabaaaaaaaaaaaaabaaaaaaaabbbaabaaabaaabaaabbabaabaaabbabaaaaaaaabba...
output:
67
result:
ok single line: '67'
Test #23:
score: 50
Accepted
time: 59ms
memory: 7740kb
input:
100000 bbaaaaabaaaaaaaaaabbaabaaaaaaabbbaabababaaababbaaaabaaaaaaaaaabaaaabbaaaaabaaaaaabbaabbbbaaabbaaaaaabbabaaabaababbaababaaabaaaaaaaaaabaaaaabbaaaaabbaaaabaaabababbbaabaaaaabaabaaaaaaabaaaaaaabaabababbbaaaaaaaaaaaaaaaaabaaaaaaabaaaaaababbbababaabaaabbbaaaaabaaaaaaabaabababaaaaaabaaaabbaabababaa...
output:
55
result:
ok single line: '55'
Test #24:
score: 50
Accepted
time: 55ms
memory: 7684kb
input:
100000 cabcacbbacbbaacbaabbaabbaabacdcadbbccabbccbbaabacacbabaccbaabbbaaabaddbcaccdcaababaaabbbbbcdacaabababcbbcbcabbbdbbbcadaadabcabbacabbdbbcaaabacaabbabbabacbabbabaadabbabdbabcbdcaacaddbbbabdabaaabcabcababbcbbaaccabbbbacaabbacdaaaabaaaaccaaabaaccbaccbbababdacaacabcaaabbaaacbcbaaabcaaabcaabbabbcad...
output:
25
result:
ok single line: '25'
Test #25:
score: 50
Accepted
time: 58ms
memory: 7744kb
input:
100000 abbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbab...
output:
96421
result:
ok single line: '96421'
Test #26:
score: 50
Accepted
time: 0ms
memory: 3648kb
input:
5 pkusc pkukp
output:
6
result:
ok single line: '6'