题目大意
题目链接
分析
因为a1 + s2 + ... + an <= 1e6
并且 n <= 1e5
, 可以看出应该有很多重读的数, 统计一下, 暴力解决。
AC代码
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| #include <map> #include <set> #include <ctime> #include <cmath> #include <queue> #include <stack> #include <bitset> #include <cctype> #include <cstdio> #include <vector> #include <utility> #include <cstdlib> #include <cstring> #include <sstream> #include <iostream> #include <algorithm> #include <unordered_map> #define eps 1e-8 using namespace std; typedef long long ll; typedef unsigned long long ull; typedef pair<int, int> P; const int N = 1e5 + 5; const int INF = 0x3f3f3f3f; const ll ll_max = 4557430888798830399;
unordered_map<int, int> ma; unordered_map<int, int> mb; int a[N], b[N];
int main(){ ios::sync_with_stdio(false);
int n, m, x; while(cin >> n >> m){ int c1 = 0, c2 = 0; ma.clear(); mb.clear(); while(n--){ cin >> x; if (ma[x] == 0) { a[c1++] = x; ma[x] = 1; } else ma[x]++; } while(m--){ cin >> x; if (mb[x] == 0){ b[c2++] = x; mb[x]++; } else mb[x]++; } ll ans = 0; for (int i = 0; i < c1; ++i){ for (int j = 0; j < c2; ++j){ ans += ll(ma[a[i]]) * ll(mb[b[j]]) * ll(sqrt(fabs(a[i] - b[j]))); } } cout << ans << "\n"; }
return 0; }
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