From c52b36c6a37fdb1d1de146d3939cb42e2c691f44 Mon Sep 17 00:00:00 2001 From: omagdy7 Date: Sat, 5 Nov 2022 01:28:02 +0200 Subject: Solved 6 problem in filtrationContest and restructured the repo --- contests/filtrationContest/C/main.cpp | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 contests/filtrationContest/C/main.cpp (limited to 'contests/filtrationContest/C/main.cpp') diff --git a/contests/filtrationContest/C/main.cpp b/contests/filtrationContest/C/main.cpp new file mode 100644 index 0000000..0d06899 --- /dev/null +++ b/contests/filtrationContest/C/main.cpp @@ -0,0 +1,23 @@ +#include + +using namespace std; + +int64_t fq[22]; + +int main () { + ios_base::sync_with_stdio(false); + cin.tie(NULL); + long long n; + cin >> n; + for (int i = 1; i <= n; i++) { + int64_t x; + cin >> x; + fq[10 + x]++; + } + int64_t ans = 0; + for (int i = 1;i <= 10; i++) { + ans += fq[10 - i] * fq[10 + i]; + } + ans += fq[10] * (fq[10] - 1) / 2; + cout << ans; +} -- cgit v1.2.3