Submission #487226

#TimeUsernameProblemLanguageResultExecution timeMemory
487226nickmet2004Diversity (CEOI21_diversity)C++11
0 / 100
1 ms204 KiB
#include<bits/stdc++.h> using namespace std; const int N = 3e5 + 5; int n , q , a[N]; int P[N] , p[N]; int main (){ cin >> n >> q; for(int i = 1; i <= n; ++i)cin >> a[i]; while(q--){ int l , r; cin >>l >> r; } sort(a + 1 , a + n + 1); vector<int> v{0}; int k = 1; for(int i = 1; i <= n; ++i){ if(a[i] == a[i + 1])k++; else v.emplace_back(k),k=1; } //for(int x : v)cout << x << " ";cout << endl; for(int i =1; i < v.size(); ++i){ p[i] = p[i - 1] + v[i]; P[i] = P[i - 1] + v[i] * i; //cout << P[i] << " "; } int sz = v.size() - 1,ans=0; for(int i =1; i < v.size(); ++i){ int x = v[i]; //cout << x << " "; //cout << P[sz] - P[i] - (i - 1) * p[sz] << "s"<<endl; ans += x * x - x*(x - 1)/2 + x * ((P[sz] - P[i]) - (i - 1) * (p[sz] - p[i])); } cout << ans; return 0; }

Compilation message (stderr)

diversity.cpp: In function 'int main()':
diversity.cpp:22:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |    for(int i =1; i < v.size(); ++i){
      |                  ~~^~~~~~~~~~
diversity.cpp:28:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |    for(int i =1; i < v.size(); ++i){
      |                  ~~^~~~~~~~~~
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