feat(codeforces): more div3 as

codeforces/988/.clang-format

@@ -0,0 +1,17 @@
+BasedOnStyle: LLVM
+IndentWidth: 4
+UseTab: Never
+
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortLambdasOnASingleLine: None
+AllowShortBlocksOnASingleLine: Never
+AllowShortEnumsOnASingleLine: false
+AllowShortCaseExpressionOnASingleLine: false
+
+BreakBeforeBraces: Attach
+ColumnLimit: 100
+AlignAfterOpenBracket: Align
+BinPackArguments: false
+BinPackParameters: false

codeforces/988/a.cc

@@ -0,0 +1,71 @@
+#include <bits/stdc++.h> // {{{
+
+#include <version>
+#ifdef __cpp_lib_ranges_enumerate
+#include <ranges>
+namespace rv = std::views;
+namespace rs = std::ranges;
+#endif
+
+#pragma GCC optimize("O2,unroll-loops")
+#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
+
+using namespace std;
+
+using i16 = int16_t;
+using u16 = uint16_t;
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+
+#if __cplusplus >= 202002L
+template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
+
+template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
+#endif
+
+#ifdef LOCAL
+#define db(...) std::print(__VA_ARGS__)
+#define dbln(...) std::println(__VA_ARGS__)
+#else
+#define db(...)
+#define dbln(...)
+#endif
+//  }}}
+
+vector<u32> f(21);
+void solve() {
+    u32 n;
+    cin >> n;
+    f.assign(f.size(), 0);
+    u32 a;
+    for (u32 i = 0; i < n; ++i) {
+        cin >> a;
+        ++f[a];
+    }
+
+    println("{}", accumulate(begin(f), end(f), 0, [](auto acc, auto x) {
+                return acc + x / 2;
+            }));
+}
+
+int main() { // {{{
+    std::cin.exceptions(std::cin.failbit);
+#ifdef LOCAL
+    std::cerr.rdbuf(std::cout.rdbuf());
+    std::cout.setf(std::ios::unitbuf);
+    std::cerr.setf(std::ios::unitbuf);
+#else
+    std::cin.tie(nullptr)->sync_with_stdio(false);
+#endif
+    u32 tc = 1;
+    std::cin >> tc;
+    for (u32 t = 0; t < tc; ++t) {
+        solve();
+    }
+    return 0;
+}
+// }}}

codeforces/988/io/2037a.1.cpin

@@ -0,0 +1,11 @@
+5
+1
+1
+2
+2 2
+2
+1 2
+4
+1 2 3 1
+6
+1 2 3 1 2 3

codeforces/988/io/2037a.1.cpout

@@ -0,0 +1,5 @@
+0
+1
+0
+1
+3

codeforces/988/io/2037b.1.cpin

@@ -0,0 +1,11 @@
+5
+3
+1 1 2
+11
+3 3 4 5 6 7 8 9 9 10 11
+8
+8 4 8 3 8 2 8 1
+6
+2 1 4 5 3 3
+8
+1 2 6 3 8 5 5 3

codeforces/988/io/2037b.1.cpout

@@ -0,0 +1,5 @@
+1 1
+3 3
+2 3
+4 1
+1 6

codeforces/988/io/2037c.1.cpin

@@ -0,0 +1,3 @@
+2
+3
+8

codeforces/988/io/2037c.1.cpout

@@ -0,0 +1,2 @@
+-1
+1 8 7 3 6 2 4 5

codeforces/988/io/2037d.1.cpin

@@ -0,0 +1,27 @@
+4
+2 5 50
+7 14
+30 40
+2 2
+3 1
+3 5
+18 2
+22 32
+4 3 50
+4 6
+15 18
+20 26
+34 38
+1 2
+8 2
+10 2
+1 4 17
+10 14
+1 6
+1 2
+1 2
+16 9
+1 2 10
+5 9
+2 3
+2 2

codeforces/988/io/2037d.1.cpout

@@ -0,0 +1,4 @@
+4
+-1
+1
+2

codeforces/988/io/2037e.1.cpin

@@ -0,0 +1,14 @@
+2
+5
+
+4
+
+0
+
+1
+
+2
+
+2
+
+0

codeforces/988/io/2037e.1.cpout

@@ -0,0 +1,13 @@
+? 1 5
+
+? 2 4
+
+? 4 5
+
+? 3 5
+
+! 01001
+
+? 1 2
+
+! IMPOSSIBLE

codeforces/988/io/2037f.1.cpin

@@ -0,0 +1,19 @@
+6
+5 5 3
+7 7 7 7 7
+1 2 3 4 5
+9 5 9
+2 4 6 8 10 8 6 4 2
+1 2 3 4 5 6 7 8 9
+2 10 2
+1 1
+1 20
+2 10 1
+69696969 420420420
+1 20
+2 10 2
+10 15
+1 19
+2 2 2
+1000000000 1
+1 3

codeforces/988/io/2037f.1.cpout

@@ -0,0 +1,6 @@
+2
+2
+-1
+6969697
+15
+1000000000

codeforces/988/io/2037g.1.cpin

@@ -0,0 +1,2 @@
+5
+2 6 3 4 6

codeforces/988/io/2037g.1.cpout

@@ -0,0 +1 @@
+5

codeforces/988/io/2037g.2.cpin

@@ -0,0 +1,2 @@
+5
+4 196 2662 2197 121

codeforces/988/io/2037g.2.cpout

@@ -0,0 +1 @@
+2

codeforces/988/io/2037g.3.cpin

@@ -0,0 +1,2 @@
+7
+3 6 8 9 11 12 20

codeforces/988/io/2037g.3.cpout

@@ -0,0 +1 @@
+7

codeforces/988/io/2037g.4.cpin

@@ -0,0 +1,2 @@
+2
+2 3

codeforces/988/io/2037g.4.cpout

@@ -0,0 +1 @@
+0