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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#241075 | #6567. Repetitive String Invention | MovingUp# | WA | 655ms | 6428kb | C++17 | 2.3kb | 2023-11-05 22:48:42 | 2023-11-05 22:48:42 |
Judging History
answer
#include <algorithm>
#include <iostream>
#include <map>
#include <unordered_map>
#include <vector>
using namespace std;
const int BASE[] = {37, 43};
const int MOD = 1e9 + 7;
int fastPow(int x, int pw, int mod) {
if (pw == 0)
return 1;
else if (pw % 2 == 0) {
int tmp = fastPow(x, pw / 2, mod);
return ((int64_t)tmp * tmp) % mod;
} else
return ((int64_t)x * fastPow(x, pw - 1, mod)) % mod;
}
struct rolling_hash {
vector<int> multInvs[2];
vector<int> sums[2];
rolling_hash(const std::string &s) {
int n = s.size();
for (int h = 0; h < 2; h++) {
int currPw = 1;
sums[h].resize(n);
for (int i = 0; i < n; i++) {
sums[h][i] = ((int64_t)(s[i] - 'a' + 1) * currPw) % MOD;
if (i != 0)
sums[h][i] = (sums[h][i] + sums[h][i - 1]) % MOD;
multInvs[h].push_back(fastPow(currPw, MOD - 2, MOD));
currPw = ((int64_t)currPw * BASE[h]) % MOD;
}
}
}
int getSubhash(int l, int r) {
vector<int> res(2);
for (int h = 0; h < 2; h++) {
int tmp = sums[h][r] - (l == 0 ? 0 : sums[h][l - 1]);
if (tmp < 0)
tmp += MOD;
res[h] = ((int64_t)tmp * multInvs[h][l]) % MOD;
}
return ((int64_t)res[0] * res[1]) % MOD;
}
};
int64_t count(const string &s, bool countZeroGreen) {
rolling_hash rh = rolling_hash(s);
int n = s.size();
int64_t ans = 0;
unordered_map<int, int> cntWithHash;
for (int lGreen = 0; lGreen < n; lGreen++) {
for (int lRed = lGreen; lRed < n; lRed++) {
for (int rRed = lRed; rRed < n; rRed++) {
int lenGreen = lRed - lGreen;
if (lenGreen != 0 && rRed + lenGreen < n &&
rh.getSubhash(lGreen, lRed - 1) !=
rh.getSubhash(rRed + 1, rRed + lenGreen))
continue;
if (rRed + lenGreen >= n)
continue;
if (lenGreen == 0 && !countZeroGreen)
continue;
auto h = rh.getSubhash(lRed, rRed);
ans += cntWithHash[h];
}
}
for (int i = 0; i <= lGreen; i++) {
auto h = rh.getSubhash(i, lGreen);
cntWithHash[h]++;
}
}
return ans;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
string s;
cin >> s;
int64_t ans = count(s, true);
reverse(s.begin(), s.end());
ans += count(s, false);
cout << ans << endl;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3824kb
input:
aaaa
output:
9
result:
ok single line: '9'
Test #2:
score: 0
Accepted
time: 0ms
memory: 3624kb
input:
axabxbcxcdxd
output:
22
result:
ok single line: '22'
Test #3:
score: 0
Accepted
time: 655ms
memory: 3564kb
input:
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...
output:
536006700
result:
ok single line: '536006700'
Test #4:
score: 0
Accepted
time: 518ms
memory: 3636kb
input:
abababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababab...
output:
136016600
result:
ok single line: '136016600'
Test #5:
score: 0
Accepted
time: 0ms
memory: 3780kb
input:
a
output:
0
result:
ok single line: '0'
Test #6:
score: 0
Accepted
time: 0ms
memory: 3604kb
input:
ab
output:
0
result:
ok single line: '0'
Test #7:
score: 0
Accepted
time: 0ms
memory: 3752kb
input:
aa
output:
1
result:
ok single line: '1'
Test #8:
score: -100
Wrong Answer
time: 344ms
memory: 6428kb
input:
bbbbbrrrrbrbrrbrbrbrbbrrbbbbrrbrrbrbrbrrrrrbbbrrbrrbbrrrbbbbbrrrrbbrbbrrrrrbbrrrbbbbbrbbrbbbrbrrbrrrrrrrrbbrbrbbrrrrrrbbbbbrbrrrrbrrbbrbrrrrrbrbrbbrbrrbrrrrbrbbrbrrbrrbbbbrrrrrbrbbrbbrrrrrbrbrbrbbbrrrrrrrbbbbbbrrbrbrrrrrbbbrbrrrrbbbbrrbrrbbbbbbbrbbbbrrrbrbbbrrrrrrbbbbbrbrrbbbbrbrbrrbbrrrbbbrbbbrbbrr...
output:
209016
result:
wrong answer 1st lines differ - expected: '209015', found: '209016'