QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #557005 | #8668. 回文路径 | forgotmyhandle | 100 ✓ | 89ms | 7924kb | C++14 | 4.1kb | 2024-09-10 23:42:05 | 2024-09-10 23:42:06 |
Judging History
answer
#include <iostream>
#define int long long
using namespace std;
const int B = 2333;
const int P = 1000000007;
int n;
string s, t;
int hs[100005], ht[100005];
int hsR[100005], htR[100005];
int pw[100005];
int hashs(int l, int r) { return (hs[r] + P - hs[l - 1] * pw[r - l + 1] % P) % P; }
int hasht(int l, int r) { return (ht[r] + P - ht[l - 1] * pw[r - l + 1] % P) % P; }
int hashsR(int l, int r) { return (hsR[l] + P - hsR[r + 1] * pw[r - l + 1] % P) % P; }
int hashtR(int l, int r) { return (htR[l] + P - htR[r + 1] * pw[r - l + 1] % P) % P; }
signed main() {
cin >> n >> s >> t;
s = ' ' + s, t = ' ' + t;
pw[0] = 1;
for (int i = 1; i <= n; i++) hs[i] = (hs[i - 1] * B + s[i] - 'a' + 1) % P, pw[i] = pw[i - 1] * B % P;
for (int i = 1; i <= n; i++) ht[i] = (ht[i - 1] * B + t[i] - 'a' + 1) % P;
for (int i = n; i; i--) hsR[i] = (hsR[i + 1] * B + s[i] - 'a' + 1) % P;
for (int i = n; i; i--) htR[i] = (htR[i + 1] * B + t[i] - 'a' + 1) % P;
int Ans = 1;
for (int i = 1; i <= n; i++) {
int l, r, mid, ans, a1, a2;
l = 1, r = min(i, n - i + 1), ans = 1;
while (l <= r) {
mid = (l + r) >> 1;
if (hashs(i - mid + 1, i) == hashsR(i, i + mid - 1))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a1 = ans;
l = 1, r = min(i - a1, n - i - a1 + 2), ans = 0;
while (l <= r) {
mid = (l + r) >> 1;
if (hashs(i - a1 - mid + 1, i - a1) == hashtR(i + a1 - 1, i + a1 + mid - 2))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a2 = ans;
Ans = max(Ans, 2 * (a1 + a2) - 1);
l = 1, r = min(i, n - i + 1), ans = 1;
while (l <= r) {
mid = (l + r) >> 1;
if (hasht(i - mid + 1, i) == hashtR(i, i + mid - 1))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a1 = ans;
l = 1, r = min(i - a1 + 1, n - i - a1 + 1), ans = 0;
while (l <= r) {
mid = (l + r) >> 1;
if (hashs(i - a1 - mid + 2, i - a1 + 1) == hashtR(i + a1, i + a1 + mid - 1))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a2 = ans;
Ans = max(Ans, 2 * (a1 + a2) - 1);
l = 1, r = min(i, n - i + 1), ans = 0;
while (l <= r) {
mid = (l + r) >> 1;
if (hashs(i - mid + 1, i) == hashtR(i, i + mid - 1))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
Ans = max(Ans, 2 * ans);
}
for (int i = 1; i < n; i++) {
int l, r, mid, ans, a1, a2;
l = 1, r = min(i, n - i), ans = 0;
while (l <= r) {
mid = (l + r) >> 1;
if (hashs(i - mid + 1, i) == hashsR(i + 1, i + mid))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a1 = ans;
// cout << i << " " << a1 << "\n";
l = 1, r = min(i - a1, n - i - a1 + 1), ans = 0;
while (l <= r) {
mid = (l + r) >> 1;
if (hashs(i - a1 - mid + 1, i - a1) == hashtR(i + a1, i + a1 + mid - 1))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a2 = ans;
Ans = max(Ans, 2 * (a1 + a2));
l = 1, r = min(i, n - i), ans = 0;
while (l <= r) {
mid = (l + r) >> 1;
if (hasht(i - mid + 1, i) == hashtR(i + 1, i + mid))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a1 = ans;
l = 1, r = min(i - a1 + 1, n - i - a1), ans = 0;
while (l <= r) {
mid = (l + r) >> 1;
if (hashs(i - a1 + 1 - mid + 1, i - a1 + 1) == hashtR(i + a1 + 1, i + a1 + mid))
ans = mid, l = mid + 1;
else
r = mid - 1;
}
a2 = ans;
Ans = max(Ans, 2 * (a1 + a2));
}
cout << Ans << "\n";
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 30
Accepted
Test #1:
score: 30
Accepted
time: 0ms
memory: 3584kb
input:
1000 mfmlkrasfiudkzrjzyrlbpitvzfrlmjdzsurtdcmnqpsyfgobbstvplqylvciloomaljyssxtrrccywyirfvlcnchwkfwbdaoxzpfpvlruptganojnfxmnlqetptmlmoyluxvaipghtlaszoozscdmjomobyzboqqmvqjpbfjsoczhkwrlcauzjceqikbaeuiqahnldpqmohfjfzgkbfdbqnoxispkejvpncwsyelebqumapgbfdrjvuaxaphnkciwzkruijmanwslkwosgyfhwbnsthhtxrhrzlgtt...
output:
6
result:
ok single line: '6'
Test #2:
score: 30
Accepted
time: 1ms
memory: 3620kb
input:
1000 wvitzoxwlmhexjuqvoxksetoupgkhattucdzfevqorkdlsymjuvhobdrjsodtipwpfhipsdnyvqtsbbasrrvyybijzmpwseckztnpnkqswgkaeivflhwevhxcchjsnelqcixexkntwiuolsditpdwypgerzijziyrgqkwuucnqaehuwkpyrmwewjitvsaebyytznbtnkulnepceeloyjpfhcdpqfqhvzsmkcynjwztmkbnqaxnikfuiutocahdfbvsgdskgwqmzizzjlbqxnngftdohetabpjzpqzyc...
output:
7
result:
ok single line: '7'
Test #3:
score: 30
Accepted
time: 1ms
memory: 3652kb
input:
1000 abababaabaababbbbabbbbabbbbbbabbbaabbbaababaabaabbabbbbaabbaabaaaabbaaabbbbaaaaaabbbbababaababbaabbbbbbbbabbaababbbbabbaabbbabaaababbaababbbaabaabaababaaababbaaaababbbbbaaabbaabbaaabbaaaaabaaaaaabbbbbaaabbbbbaabbbbababaabaabbbbaaaaababaaaababbbbbbaababbbaaaababaabaabaabaaaaaabbabbabbbbbbbbbbabb...
output:
28
result:
ok single line: '28'
Test #4:
score: 30
Accepted
time: 1ms
memory: 3676kb
input:
1000 ababbababababbaababaaabaabaababbaabbbabaababbaaababbabbbbaabbababbbababbabababbaabbbaababbabaaaaabbbbbaaaaaaaaabbbbaabbbaabbababaaabababbaaaabababbbaabaabbabbaabaaaaaaabaaabaaababaaaababbaaabaabbbbbbaabbabaaabaabbbbabbababbbaaaaabbabbaabbaabbaabaaabaaabbbbbaabaaaaaababbbbbabbbabbbabababbbbbabaa...
output:
27
result:
ok single line: '27'
Test #5:
score: 30
Accepted
time: 1ms
memory: 3612kb
input:
1000 abbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabba...
output:
987
result:
ok single line: '987'
Test #6:
score: 30
Accepted
time: 1ms
memory: 3540kb
input:
1000 aaaaaaababbabbabaabaaaaababaaaaaabaabaaaabaaaaaaabbbabaabbaaabaaaaaaabaaaaaaaabaaabbaababaaaaaaaaabbaabbabbaaaaabaaaaaaaabbaaabaaaaaaaaaaabaabbbbbaaaabaaaaaaaaabbbaaaaabaaabaaaaaaaaaaaaaababaaaaabbaabbaaaabaabaaaababaaaaaababaaaaabaaaaaaabaaaababaaaabbaaaabaaaaabaaaaaaaabaaaaaaabaaaaaaaaaaaabaa...
output:
45
result:
ok single line: '45'
Test #7:
score: 30
Accepted
time: 1ms
memory: 3592kb
input:
1000 aaaaaabaaaaaaaababaaaaaaababaaaabaabaaaaabaabaaaabbaaaaabaababaaaaaaaaaaabaaaabaaaaaaaaaaaaaaaaaabbaaaaaaababaabaaaabababaaaaabbaaaaaabbababaaabbaaababbaaaabbababaaaaaaaaabbbaaaababaaaaabaaaabbaabaaaaaabbaabaaaaaaaaaaabaaaababbaaaaaaaababbabaaaaaaaaabaaaabaaaaabaaaaaaaaaaaabaaaabaaababaabaabaab...
output:
45
result:
ok single line: '45'
Test #8:
score: 30
Accepted
time: 1ms
memory: 3872kb
input:
1000 aabaaaabaaaabaaabaabbbaabaabbbaaaaaaaaaabaaaaabaababaabaabaaaaaaaaaabbabbaaaaaaaabaabbbbbaaaabbabbbaaaaaabababbaaaabaaaaaaaaabaaaaaaaabaaaaaabbaaaaabaaaaaababaaababaaaabaaaaaabaaaaaaabaaaaabbaaaaabaababaaaabbaaabbaabaabaaaaababbababaaabbbabaabaaabaaabaababbabaababaaaaabaaababaaaaaaaaaabbaaaabaa...
output:
36
result:
ok single line: '36'
Test #9:
score: 30
Accepted
time: 1ms
memory: 3648kb
input:
1000 aaaaaabaabaaaaaaabaaaaaabaabaaaaaaaaabaabaaaaaaababaaaaabaaabaabaaabaaaaaaaaaaaaabbbbbabaaaaaaabaaaaabaaabaaaaabababaaabaaabaabaabaaaabbaabaaaaaaaaaaaaaaabbaaaaabaabbabbbaaabbbabaababbaabaaaabbaaaabaabbbaaaaaaaaaabaabaaaabbaaaabbbbaaabaaaaabaaababaaaaaaaaaabbabbabaaaaaaaaaaaaaaaabaababbaaaababa...
output:
50
result:
ok single line: '50'
Test #10:
score: 30
Accepted
time: 1ms
memory: 3656kb
input:
1000 aaccbdbabdaaddabaabaaaacbbccdbabbaacabcdababdcacadababaadaaaadabacababcdbaabaaaabdbabbdcaacccaaacababaacbcacaaabbabbaaabcbaaabaababbaaacbaacaaacabdccbbbaabaccacadbbcaabacadaababbaaabababbacaabbaaabcdaabaaaaaabaababaabcabacaabacaaaaaacaaabcbcabcbbcbbbaacaadadbadbbadcabababcabbcbbdadbdababaaadcab...
output:
20
result:
ok single line: '20'
Subtask #2:
score: 20
Accepted
Test #11:
score: 20
Accepted
time: 73ms
memory: 7652kb
input:
100000 ibhqhodaqcwqggmckoemulhkgbfidceskhefhsonccepfodalabaqgobpgcnaervbccadkbtsdigsoqochklocgbjjqcdhwrlacamprsoilyhiwkkjalicedhbxajrkhjgivjhnfdibkdwtexnnriegejazmohlfijbeigfmpngncokxhifjfuwuogccdfglfbxobnarmgfhgpnjjewicgfhcmfbbnjbbjjtbprnagpchcihcihfhcikeaecefdgeegtzlfdolhfieahiehdfcaflmndmcojceblf...
output:
9
result:
ok single line: '9'
Test #12:
score: 20
Accepted
time: 73ms
memory: 7712kb
input:
100000 fruiifpdggdnsbgamakpjipicaidfdjpffioqcwioaafbpdagmbbakqpekjabcljockpvcifilcjakhcboolgjbnmmrbeawcjopbccjgncdaucighprheiaqofriccfdbydbhijeelbthsmqbhcddlfemqkvdbflkdrifckarqwlaafifmqibssfukblchalkzdefnccaiabrhcrmisdeiqddccrqhiiwcqqakbfhebkiecahgdlibhgmegkfbuibcarcbajpdeboigeoctdljmqeckdfqahiecla...
output:
9
result:
ok single line: '9'
Test #13:
score: 20
Accepted
time: 73ms
memory: 7720kb
input:
99999 biwnbsgdlxognjnepijlgbfbbahicjfqhdhcielcovdflacbrgcfapifaylqfmvipcccoofthuutfheboncacenchdgfljpidjbasdsikduidkbdqckmlnbfaidlincqkccbbpmnqnpbjoclgeduitraqmdfgdqinhddgberlbnlgggoafgqllbifekoccpgemcgdiiackkcfjgddhieabhzdjfwegcbuncdadebglitgwcbpmclfijmqtbbnbbrcehhanjgbddiaoimmkehtloreemecckjejifck...
output:
11
result:
ok single line: '11'
Test #14:
score: 20
Accepted
time: 73ms
memory: 7692kb
input:
99999 chgjcjipccsmclcpjqmbrcpaqdggbdodxbcejbklpjhkefeidkjojjjbljhtykbcdgnnjeictgjgliegyfilmlkqkgddpefibjusamblbpqfbbvcfkgfagikbujlbjvenjbmcadceadnltdeksatckmkjkscojeqbpaaglggxhideqhkhibchdasadfggcoihhcwlphbeevohhohtthepedqfggbdglidnatocrkhnkijraddqbesaiajimdhdmvbgodlcglqqmkeehcfabeaatjdinzhijewfoxhh...
output:
9
result:
ok single line: '9'
Test #15:
score: 20
Accepted
time: 55ms
memory: 7692kb
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: 73ms
memory: 7924kb
input:
100000 vucutyzmjlnyadjbpqkrlqvzuponzxrvqsqqgbemhzjftdkksfgspeuonmjwlbirvszhcafcxpeubixvxetwyyqmftbobhodwaiwrcwdvddohalyqgaatvpflorvjypszbvzpwiaxxgievaozquixcndkxqfxcxaiygyqcgdebogwzquvqfljgjcvvhpirfzqlkwctibngdsffpormliyhrkcbxwxoaoovaawldfenziwnlahllzhjsvdhzekcqekayusmvzrgsdiiymjxfiddhawhgxathvnsedf...
output:
10
result:
ok single line: '10'
Test #17:
score: 50
Accepted
time: 73ms
memory: 7704kb
input:
100000 fotxrzsqxuaaiiqmiymhtfdipylgdmxizgzqrgbrmdemonbisusgbmmsgtyoaqgdmxwoxayxkszpvpypzjoapilopvhyiyhckcccaalqriunudgfifgvdiufjtukpsmdfjjzftszwizrwoxuqsujchtrywpiiineoscbvarbalizfyydbctxpuwndzgshavpygfcmxkorbcppbatauqqkumaqsjcupnihewaukjajqgdvatobxjgdcbevlxpkjdvpofwtctivkexpwnbwvwbhcmlivuvifpptiupy...
output:
9
result:
ok single line: '9'
Test #18:
score: 50
Accepted
time: 80ms
memory: 7860kb
input:
100000 baaabababbbaabbbbaabbabbababbbbbaaaaabaabbbbbbaaabaabaaabababbabbabbaababbaababbbabaaaaabbbabbabaaaabaabbbbababaaaaabbbbbabbbababbbbbaaabbaaabaabaaababbababbabaaaaaaaababaaabaababbbababbbbabbbabaaababbababbbababaabbaabbabaaaabaaabbbabbaabbabbbbbbabbbbaaaaaaaaaaabbbaabaaaabbbabbbaabababbbbaabb...
output:
40
result:
ok single line: '40'
Test #19:
score: 50
Accepted
time: 80ms
memory: 7588kb
input:
100000 babbbbaabaaaaaaaaaabbbbababababababababbabaaabbaaaaabaaaabaaaaababaabaabaabbbbabbbaabababbbaaabaaaaaaababaabababababbaabbbaabaabbbbbbbabaabbaabaaaababbbaabaaabaaaabbabbababbaabbabbbaabbbaababbaabaabaabbabbbabaaaaaaaaaabaabbabaaaaababaabbababbbabababbbbabbbbababababaabbabbababbaababababbbbaaba...
output:
43
result:
ok single line: '43'
Test #20:
score: 50
Accepted
time: 89ms
memory: 7636kb
input:
100000 aabaabbaaaaabbbbbaaaaaaaaaaaaaabbaaaaaaaaabaaaabbaaaaaabaaaaabaabbaaabababaaabbaaaaaaaaaabbabbbaaaaaaabaaabbbaabaaabaaabaaaaaaaaaabaabaaaababaaaaaabbaaaaaaababaabaaaaabababaaaaaaaaaababaaaababbaaabaaaabaaaaabaababbaaaaabbaaabaabaabaaaaababaaaaabbaaaabaaaaaaabaaaaaaaaabaabaaaaaabaababbbabaaaba...
output:
75
result:
ok single line: '75'
Test #21:
score: 50
Accepted
time: 83ms
memory: 7720kb
input:
100000 aaaabaabaaabaabbaaaabbbaaaaaaabaabaabaabaaaababaaaaabaaaaabbabaabbaabaaaaaabaaaaaaaaaaaaabaabbabaaaaaabaaaaaaaaaaaabaaaabbbabaaaaaabaaaababaaaabaaaaaabbaaaaaaaaabababaaaaabaabababaaabbababaaaaababababbaaaaaabaabaaaabbababbbaaabaaaabaabaaaaabaabaaaaaabbbaaaaaaabababababbaaabaaabaaababaaaabaaaa...
output:
58
result:
ok single line: '58'
Test #22:
score: 50
Accepted
time: 83ms
memory: 7724kb
input:
100000 abbaaaaaaabaaaaaaaabaaaaaaaaaaaaaaaaabbabaaabaaaaaaaaaaaaaaabaaabbbaabaaaaabaaaaaaabaaaaabaabaabaaaababaaaaaaaaaaaaaaaaabaaabbabaaaaaaabaaaaaaabaaaaaabaaaaabaaabbaaaabbaabbaaababaababaaaaaabaaaaabaaaaaaaaaaaaababaaaaabaaaaaabbbabaaaaaaaaaaaaabaaaaaaaabbbaabaaabaaabaaabbabaabaaabbabaaaaaaaabba...
output:
67
result:
ok single line: '67'
Test #23:
score: 50
Accepted
time: 84ms
memory: 7632kb
input:
100000 bbaaaaabaaaaaaaaaabbaabaaaaaaabbbaabababaaababbaaaabaaaaaaaaaabaaaabbaaaaabaaaaaabbaabbbbaaabbaaaaaabbabaaabaababbaababaaabaaaaaaaaaabaaaaabbaaaaabbaaaabaaabababbbaabaaaaabaabaaaaaaabaaaaaaabaabababbbaaaaaaaaaaaaaaaaabaaaaaaabaaaaaababbbababaabaaabbbaaaaabaaaaaaabaabababaaaaaabaaaabbaabababaa...
output:
55
result:
ok single line: '55'
Test #24:
score: 50
Accepted
time: 74ms
memory: 7920kb
input:
100000 cabcacbbacbbaacbaabbaabbaabacdcadbbccabbccbbaabacacbabaccbaabbbaaabaddbcaccdcaababaaabbbbbcdacaabababcbbcbcabbbdbbbcadaadabcabbacabbdbbcaaabacaabbabbabacbabbabaadabbabdbabcbdcaacaddbbbabdabaaabcabcababbcbbaaccabbbbacaabbacdaaaabaaaaccaaabaaccbaccbbababdacaacabcaaabbaaacbcbaaabcaaabcaabbabbcad...
output:
25
result:
ok single line: '25'
Test #25:
score: 50
Accepted
time: 79ms
memory: 7852kb
input:
100000 abbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbabbababbababbabbababbababbabbababbabbababbababbabbababbababbab...
output:
96421
result:
ok single line: '96421'
Test #26:
score: 50
Accepted
time: 0ms
memory: 3764kb
input:
5 pkusc pkukp
output:
6
result:
ok single line: '6'