Language: C++

#include "bits/stdc++.h"
#include<unordered_map>
#include<unordered_set>
#pragma warning(disable:4996)
using namespace std;
using ld = long double;
template<class T>
using Table = vector<vector<T>>;
ld eps=1e-9;

vector<vector<int>>mirror(vector<vector<int>>from) {
	vector<vector< int>>to(from.size(), vector< int>(from[0].size()));
	for (int i = 0; i < from.size(); ++i) {
		for (int j = 0; j < from[i].size(); ++j) {
			to[i][from[i].size() - j - 1] = from[i][j];
		}
	}
	return to;
}
vector<vector<int>>rotate(vector<vector<int>>from) {
	vector<vector<int>>to(from[0].size(), vector< int>(from.size()));
	for (int i = 0; i < from.size(); ++i) {
		for (int j = 0; j < from[i].size(); ++j) {
			to[j][from.size()-i-1] = from[i][j];
		}
	}
	return to;
}

struct RollingHash {
	static const  int mul0 = 7, mul1 = 11;
	static const  int add0 = 23, add1 = 29;
	size_t len;
	vector<int> hash_, hash2_;
	static vector<int> pmo_, pmo2_;
	void init(vector<int> s) {
		len = s.size();
		hash_.resize(len + 1);
		hash2_.resize(len + 1);



		hash_[0] = 0;
		hash2_[0] = 0;

		if (pmo_.empty()) {
			pmo_.push_back(1), pmo2_.push_back(1);
		}
		while (pmo_.size() <= len) {
			pmo_.push_back(pmo_.back() * mul0);
			pmo2_.push_back(pmo2_.back() * mul1);
		}
		for (unsigned int i = 0; i < len; ++i) {
			hash_[i + 1] = (hash_[i] * mul0 + s[i]);
			hash2_[i + 1] = (hash2_[i] * mul1 + s[i]);
		}
	}
	void init(string s) {
		len = s.size();
		hash_.resize(len + 1);
		hash2_.resize(len + 1);



		hash_[0] = 0;
		hash2_[0] = 0;

		if (pmo_.empty()) {
			pmo_.push_back(1), pmo2_.push_back(1);
		}
		while (pmo_.size() <= len) {
			pmo_.push_back(pmo_.back() * mul0);
			pmo2_.push_back(pmo2_.back() * mul1);
		}
		for (unsigned int i = 0; i < len; ++i) {
			hash_[i + 1] = (hash_[i] * mul0 + s[i]);
			hash2_[i + 1] = (hash2_[i] * mul1 + s[i]);
		}
	}
	pair<int, int >  hash(int l, int r) { // s[l..r]
		return make_pair(hash_[r + 1] - hash_[l] * pmo_[r + 1 - l],
			hash2_[r + 1] - hash2_[l] * pmo2_[r + 1 - l]);
	}
	pair<int, int >  hash() { // s[all]
		return hash(0, len - 1);
	}

	//hash????????????
	static pair<int, int> concat(pair<int,  int> L, pair<int, int> R, int RLength) { // hash(L+R) 
		return make_pair((R.first + L.first*pmo_[RLength]), (R.second + L.second*pmo2_[RLength]));
	}
};
vector<int> RollingHash::pmo_;
vector<int> RollingHash::pmo2_;
int main() {
	map<char, int>mp;
	for (int i = 0; i < 26; ++i) {
		mp['a' + i] = 26 + i;
		mp['A' + i] = i;
	}
	for (int i = 1; i <= 9; ++i) {
		mp['0' + i] = 52 + i;
	}
	mp['0'] = 52;
	mp['+'] = 62;
	mp['/'] = 63;
	while (1) {
		int W, H, Q; cin >> W >> H >> Q;
		if (!W)break;
		vector<vector<int>>fields(H);
		for (int i = 0; i < H; ++i) {
			string st; cin >> st;
			for (int j = 0; j < st.size(); ++j) {
				bitset<6>bs(mp[st[j]]);
				for (int k = 0; k < 6; ++k) {
					fields[i].push_back(bs[5-k]);
				}
			}
		}
		vector<vector<int>>wally(Q);
		for (int i = 0; i < Q; ++i) {
			string st; cin >> st;
			int rest = Q;
			for (int j = 0; j < st.size(); ++j) {
				bitset<6>bs(mp[st[j]]);
				
				for (int k = 0; k < 6; ++k) {
					if (rest) {

						wally[i].push_back(bs[5-k]);
						rest--;
					}
				}
				
			}
			wally[i].resize(Q);
		}
		set<vector<vector<int>>>wallys;

		for (int i = 0; i < 4; ++i) {
			wallys.emplace(wally);
			wallys.emplace(mirror(wally));
			wally = rotate(wally);
		}
		vector<RollingHash>firhs(H);
		for (int i = 0; i < H; ++i) {
			firhs[i].init(fields[i]);
		}
		int ans = 0;
		vector<vector<int>>memo(H, vector<int>(W, -1));
		for (const auto w : wallys) {
			vector<RollingHash>warhs(w.size());
			for (int i = 0; i < w.size(); ++i) {
				warhs[i].init(w[i]);
			}
			for (int l = 0; l < int(fields[0].size()) - int(w[0].size())+1; ++l) {
				const int r = l + w[0].size() - 1;
				for (int u = 0; u < int(fields.size())-int(w.size())+1; u++)
				{
					const int d = u + w.size() - 1;
					bool ok = true;
					else {
						for (size_t y = u; y <= d; y++)
						{
							if (firhs[y].hash(l, r) != warhs[y - u].hash()) {
								ok = false;
								break;
							}
						}
					}
					
					if (ok)ans++;
				}
			}
		}
		cout << ans << endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:162:41: error: 'else' without a previous 'if'
  162 |                                         else {
      |                                         ^~~~