91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
#include <bits/stdc++.h> // {{{
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// https://codeforces.com/blog/entry/96344
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#pragma GCC optimize("O2,unroll-loops")
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#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
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using namespace std;
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using i32 = int32_t;
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using u32 = uint32_t;
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using i64 = int64_t;
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using u64 = uint64_t;
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using f64 = double;
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using f128 = long double;
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#if __cplusplus >= 202002L
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template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
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template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
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template <typename T> [[nodiscard]] static T sc(auto &&x) {
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return static_cast<T>(x);
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}
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template <typename T> [[nodiscard]] static T sz(auto &&x) {
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return static_cast<T>(x.size());
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}
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#endif
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static void NO() { std::cout << "NO\n"; }
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static void YES() { std::cout << "YES\n"; }
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#define all(x) (x).begin(), (x).end()
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#define rall(x) (x).rbegin(), (x).rend()
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#define ff first
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#define ss second
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#ifdef LOCAL
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#define db(...) std::print(__VA_ARGS__)
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#define dbln(...) std::println(__VA_ARGS__)
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#else
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#define db(...)
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#define dbln(...)
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#endif
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// }}}
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void solve() {
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u32 n, m;
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cin >> n >> m;
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array<vector<string>, 2> cows{vector<string>(n), vector<string>(n)};
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for (auto &e : cows)
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for (auto &g : e)
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cin >> g;
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u32 ans = 0;
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for (u32 col = 0; col < m; ++col) {
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unordered_set<char> plain;
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for (u32 i = 0; i < n; ++i)
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plain.insert(cows[0][i][col]);
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u32 i;
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for (i = 0; i < n; ++i)
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if (plain.find(cows[1][i][col]) != plain.end()) {
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break;
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}
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ans += i == n;
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}
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cout << ans << '\n';
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}
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int main() { // {{{
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cin.tie(nullptr)->sync_with_stdio(false);
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cin.exceptions(cin.failbit);
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#define PROBLEM_NAME "cownomics"
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#ifdef LOCAL
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freopen("io/" PROBLEM_NAME ".in", "r", stdin);
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freopen("io/" PROBLEM_NAME ".out", "w", stdout);
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#else
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freopen(PROBLEM_NAME ".in", "r", stdin);
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freopen(PROBLEM_NAME ".out", "w", stdout);
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#endif
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solve();
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return 0;
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}
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// }}}
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