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February 13, 2017 07:10
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AOJ1316
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#include <bits/stdc++.h> | |
using namespace std; | |
#define INF 1001000100010001000 | |
#define MOD 1000000007 | |
#define EPS 1e-10 | |
#define int long long | |
#define rep(i, N) for (int i = 0; i < N; i++) | |
#define Rep(i, N) for (int i = 1; i < N; i++) | |
#define For(i, a, b) for (int i = (a); i < (b); i++) | |
#define pb push_back | |
#define mp make_pair | |
#define i_i pair<int, int> | |
#define vi vector<int> | |
#define vvi vector<vi > | |
#define vb vector<bool> | |
#define vvb vector<vb > | |
#define vp vector< i_i > | |
#define all(a) (a).begin(), (a).end() | |
#define Int(x) int x; scanf("%lld", &x); | |
//int dxy[5] = {0, 1, 0, -1, 0}; | |
int dx[8] = {1, 1, 1, 0, 0, -1, -1, -1}; | |
int dy[8] = {1, 0, -1, 1, -1, 1, 0, -1}; | |
// assign | |
string comp(string a, string b); | |
signed main() | |
{ | |
int n, m; | |
while (cin >> n >> m, n) { | |
vector<string> donut(n); | |
rep(i, n) { | |
cin >> donut[i]; | |
} | |
set<string> can; | |
string ans = "z"; | |
rep(i, n) { | |
rep(j, m) { | |
rep(k, 8) { | |
vvb used(n, vb(m, false)); | |
string spell; | |
int x = i, y = j; | |
while (!used[x][y]) { | |
spell.pb(donut[x][y]); | |
used[x][y] = true; | |
if (can.find(spell) != can.end()) { | |
ans = comp(ans, spell); | |
} else { | |
can.insert(spell); | |
} | |
x = (x + dx[k] + n) % n; y = (y + dy[k] + m) % m; | |
} | |
} | |
} | |
} | |
cout << ((ans.length() > 1) ? ans : "0") << endl; | |
} | |
return 0; | |
} | |
string comp(string a, string b) | |
{ | |
if (a.length() < b.length()) { | |
return b; | |
} else if (a.length() > b.length()) { | |
return a; | |
} else { | |
rep(i, a.length()) { | |
if (a[i] < b[i]) { | |
return a; | |
} else if (a[i] > b[i]) { | |
return b; | |
} | |
} | |
} | |
return a; | |
} | |
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How to use "set"