CSES - Datatähti 2023 loppu - Results
Submission details
Task:Merkkijonot
Sender:vgtcross
Submission time:2023-01-21 14:12:19 +0200
Language:C++ (C++11)
Status:READY
Result:100
Feedback
groupverdictscore
#1ACCEPTED15
#2ACCEPTED55
#3ACCEPTED30
Test results
testverdicttimegroup
#1ACCEPTED0.00 s1, 2, 3details
#2ACCEPTED0.00 s1, 2, 3details
#3ACCEPTED0.00 s1, 2, 3details
#4ACCEPTED0.00 s1, 2, 3details
#5ACCEPTED0.00 s2, 3details
#6ACCEPTED0.00 s2, 3details
#7ACCEPTED0.00 s2, 3details
#8ACCEPTED0.00 s2, 3details
#9ACCEPTED0.00 s3details
#10ACCEPTED0.01 s3details
#11ACCEPTED0.01 s3details
#12ACCEPTED0.03 s3details
#13ACCEPTED0.00 s3details
#14ACCEPTED0.00 s3details
#15ACCEPTED0.00 s2, 3details
#16ACCEPTED0.00 s3details

Code

#include <bits/stdc++.h>
#define MODE 0
#if MODE == 1
#define debug(x) cout << #x << ": " << x << endl
#define log(x) cout << x << endl
#else
#define debug(x)
#define log(x)
#endif
#define M 1000000007
using namespace std;
using ll = long long;
using pii = pair<int, int>;
void solve() {
int n;
cin >> n;
vector<pii> v(n, {0, 0});
int acnt=0, bcnt=0;
for (int i = 0; i < n; ++i) {
string s;
cin >> s;
for (char c: s) {
if (c == 'a') {
++v[i].first;
++acnt;
} else {
++v[i].second;
++bcnt;
}
}
}
if ((acnt&1) || (bcnt&1)) {
cout << "0\n";
return;
}
int agoal = acnt>>1;
int bgoal = bcnt>>1;
ll dp[agoal+1][bgoal+1];
ll next[agoal+1][bgoal+1];
memset(dp, 0, sizeof(dp));
memset(next, 0, sizeof(next));
dp[0][0] = 1;
int anow = 0;
int bnow = 0;
for (int i = 0; i < n; ++i) {
for (int j = 0; j <= anow && j <= agoal; ++j) {
for (int k = 0; k <= bnow && k <= bgoal; ++k) {
next[j][k] = (next[j][k] + dp[j][k]) % M;
if (j + v[i].first <= agoal && k + v[i].second <= bgoal) {
next[j + v[i].first][k + v[i].second] = (next[j + v[i].first][k + v[i].second] + dp[j][k]) % M;
}
}
}
copy(next[0], next[agoal]+bgoal+1, dp[0]);
memset(next, 0, sizeof(next));
anow += v[i].first;
bnow += v[i].second;
}
cout << dp[agoal][bgoal] << '\n';
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
//freopen("input.txt", "r", stdin);
solve();
return 0;
}

Test details

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

input
4
b
bbb
baabaabaa
aab

correct output
0

user output
0

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

input
8
b
bb
baa
a
...

correct output
12

user output
12

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

input
16
a
a
a
b
...

correct output
5040

user output
5040

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

input
16
b
b
a
a
...

correct output
0

user output
0

Test 5

Group: 2, 3

Verdict: ACCEPTED

input
5
bab
bbaaabbabbbaababbbabbabaaabaaa...

correct output
0

user output
0

Test 6

Group: 2, 3

Verdict: ACCEPTED

input
10
baabbbababbbabbaaaabab
aabaaabbbab
aaaabbabab
aab
...

correct output
2

user output
2

Test 7

Group: 2, 3

Verdict: ACCEPTED

input
20
aaaab
baaab
babb
b
...

correct output
4332

user output
4332

Test 8

Group: 2, 3

Verdict: ACCEPTED

input
100
a
b
a
b
...

correct output
433105324

user output
433105324

Test 9

Group: 3

Verdict: ACCEPTED

input
10
aaaabbabbaabbaaaabbbbabaaaabab...

correct output
0

user output
0

Test 10

Group: 3

Verdict: ACCEPTED

input
50
aaba
aaa
abbbbaaba
ababbabbabab
...

correct output
636733956

user output
636733956

Test 11

Group: 3

Verdict: ACCEPTED

input
100
ba
bbbaba
bbba
bb
...

correct output
264657218

user output
264657218

Test 12

Group: 3

Verdict: ACCEPTED

input
500
a
b
b
b
...

correct output
394045503

user output
394045503

Test 13

Group: 3

Verdict: ACCEPTED

input
2
bbbababaaaabbbaaaaaaabbabbbaab...

correct output
2

user output
2

Test 14

Group: 3

Verdict: ACCEPTED

input
1
bbbaaaabaabbbababbbbbbbbabbbaa...

correct output
0

user output
0

Test 15

Group: 2, 3

Verdict: ACCEPTED

input
100
a
a
a
a
...

correct output
538992043

user output
538992043

Test 16

Group: 3

Verdict: ACCEPTED

input
500
a
a
a
a
...

correct output
515561345

user output
515561345