Submission #994287
Source Code Expand
#include <bits/stdc++.h> #define MOD 1000000007 using namespace std; typedef long long LL; LL gcd(LL a, LL b){ if(b == 0) return a; return gcd(b,a%b); } LL powmod(LL a, LL n){ if(n == 0) return 1; if(n % 2) return (a*powmod(a,n-1)) % MOD; LL c = powmod(a,n/2); return (c*c) % MOD; } LL inv(LL a){ return powmod(a,MOD-2) % MOD; } int main(){ int a, b; cin >> a >> b; int freq[26]; string s[a]; for(int i = 0; i < a; i++) cin >> s[i]; LL ans = 1; LL num24 = 0; for(int i = 0; i < a-1-i; i++){ for(int j = 0; j < b-1-j; j++){ //cout << i << " " << j << endl; for(int z = 0; z < 26; z++) freq[z] = 0; freq[s[i][j]-'a']++; freq[s[a-1-i][j]-'a']++; freq[s[i][b-1-j]-'a']++; freq[s[a-1-i][b-1-j]-'a']++; LL r = 24; for(int z = 0; z < 26; z++){ if(freq[z] == 4) r /= 24; if(freq[z] == 3) r /= 6; if(freq[z] == 2) r /= 2; } if(r != 24) num24++; ans *= r; ans %= MOD; } } if(a >= 4 && b >= 1){ LL c = (a/2-1)*(b/2-1); if(c-num24 >= 0){ ans *= powmod(inv(2),c-num24); } } if(a % 2){ int c = (a-1)/2; LL ok = 1; for(int j = 0; j < b; j++){ if(s[c][j] != s[c][b-1-j]) ok = 2; } ans *= ok; ans %= MOD; } if(b % 2){ int c = (b-1)/2; LL ok = 1; for(int j = 0; j < a; j++){ if(s[j][c] != s[a-1-j][c]) ok = 2; } ans *= ok; ans %= MOD; } cout << ans % MOD << endl; }
Submission Info
Submission Time | |
---|---|
Task | A - Where's Snuke? |
User | ksun48 |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 1434 Byte |
Status | WA |
Exec Time | 116 ms |
Memory | 384 KB |
Judge Result
Set Name | sample | all | ||||||
---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 100 | ||||||
Status |
|
|
Set Name | Test Cases |
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sample | sample-01.txt, sample-02.txt |
all | sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
01-01.txt | WA | 3 ms | 256 KB |
01-02.txt | WA | 3 ms | 256 KB |
01-03.txt | WA | 3 ms | 256 KB |
01-04.txt | WA | 3 ms | 256 KB |
01-05.txt | RE | 116 ms | 384 KB |
01-06.txt | WA | 3 ms | 256 KB |
01-07.txt | WA | 3 ms | 384 KB |
sample-01.txt | WA | 3 ms | 256 KB |
sample-02.txt | WA | 3 ms | 256 KB |