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| #include <iostream>
#include <sstream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#define REP(i,k,n) for(int i=k;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
#define INF 1<<30
#define mp make_pair
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
int ans = 0;
vector<P> v;
int dy[4] = {0, 0, 2, 2};
int dx[4] = {0, 2, 0, 2};
int ID[4][4] = {0};
void dfs(int id, set<int> st[4][4], vector<string> s) {
if(id == v.size()) {
bool ok = true;
rep(t, 4) {
set<int> ch;
REP(i, dy[t], dy[t] + 2) {
REP(j, dx[t], dx[t] + 2) {
ch.insert(s[i][j]);
}
}
if(ch.size() == 4) continue;
ok = false;
}
rep(i, 4) {
rep(j, 4) {
set<int> ch;
rep(y, 4) {
rep(x, 4) {
if(y == i) ch.insert(s[y][x]);
}
}
if(ch.size() != 4) ok = false;
ch.clear();
rep(y, 4) {
rep(x, 4) {
if(x == j) ch.insert(s[y][x]);
}
}
if(ch.size() != 4) ok = false;
}
}
if(ok) {
ans++;
}
return;
}
int y = v[id].first;
int x = v[id].second;
if(st[y][x].size() == 0) return;
set<int> tmp[4][4];
rep(i, 4) rep(j, 4) tmp[i][j] = st[i][j];
vector<string> res = s;
each(it, st[y][x]) {
int d = *it;
vector<P> pre;
res[y][x] = char('0' + *it);
rep(i, 4) {
rep(j, 4) {
if(i == y || j == x) {
if(tmp[i][j].find(d) == tmp[i][j].end()) continue;
tmp[i][j].erase(d);
pre.push_back(mp(i, j));
}
}
}
int t = ID[y][x];
REP(i, dy[t], dy[t] + 2) {
REP(j, dx[t], dx[t] + 2) {
if(tmp[i][j].find(d) == tmp[i][j].end()) continue;
tmp[i][j].erase(d);
pre.push_back(mp(i, j));
}
}
dfs(id + 1, tmp, res);
res[y][x] = '-';
rep(i, pre.size()) {
tmp[pre[i].first][pre[i].second].insert(*it);
}
}
}
class SillySudoku {
public:
int countWays(vector <string> board) {
int n = 4;
set<int> st[4][4];
v.clear();
rep(i, n) {
rep(j, n) {
rep(k, n) {
st[i][j].insert(k+1);
}
}
}
bool flag = false;
rep(t, 4) {
set<int> del;
REP(i, dy[t], dy[t] + 2) {
REP(j, dx[t], dx[t] + 2) {
ID[i][j] = t;
if(board[i][j] == '-') {
v.push_back(mp(i, j));
continue;
}
int d = int(board[i][j] - '0');
del.insert(d);
}
}
REP(i, dy[t], dy[t] + 2) {
REP(j, dx[t], dx[t] + 2) {
each(it, del) {
if(st[i][j].find(*it) == st[i][j].end()) continue;
st[i][j].erase(*it);
}
}
}
}
rep(i, 4) {
rep(j, 4) {
if(board[i][j] == '-') continue;
int d = int(board[i][j] - '0');
rep(y, 4) {
rep(x, 4) {
if(y == i || x == j) {
if(st[y][x].find(d) == st[y][x].end()) continue;
st[y][x].erase(d);
}
}
}
}
}
if(flag) {
return 0;
}
ans = 0;
dfs(0, st, board);
return ans;
}
};
|