108 lines
2.0 KiB
C++
108 lines
2.0 KiB
C++
/*
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VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
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VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
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*/
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#include <assert.h>
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#include <iostream>
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#include <sstream>
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#include <fstream>
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#include <iomanip>
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#include <exception>
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#include <stdexcept>
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#include <map>
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#include <set>
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#include <list>
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#include <vector>
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#include <string>
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#include <memory>
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#include <functional>
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#include <algorithm>
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#include <utility>
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#include <limits>
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#include <math.h>
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typedef long long ll;
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typedef std::vector<ll> vec;
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void check(bool b) { if (!b) std::cerr << "error" << std::endl; }
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template <typename T>
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std::string to_string( T t ){
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std::stringstream ss;
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ss << t;
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return ss.str();
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}
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/*
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*/
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auto solve_puzzle(std::istream& is)
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{
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long long n, k, r, h;
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is >> n >> k;
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std::vector<std::pair<double,double>> v;
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for ( int i = 0; i < n; ++i){
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is >> r >> h;
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v.push_back(std::make_pair(r*r,2*h*r));
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}
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double mrr = 0, s2rh = 0;
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for ( int i = 0; i < k; ++i ) {
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auto mit = v.begin();
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for ( auto it = v.begin(); it != v.end(); ++it ) {
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if ( (std::max(it->first-mrr,0.) + it->second)
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> (std::max(mit->first-mrr,0.) + mit->second) ) {
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mit = it;
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}
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}
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mrr = std::max(mit->first, mrr );
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s2rh += mit->second;
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mit->first = 0;
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mit->second = 0;
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}
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return 3.14159265359 * (s2rh + mrr);
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}
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void read_input_and_solve( std::istream& is, std::ostream& os )
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{
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srand((unsigned)time(NULL));
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int puzzle_count;
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is >> puzzle_count;
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is.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
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for (int i = 1; i <= puzzle_count; i++)
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{
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os << "Case #" << i << ": ";
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auto r = solve_puzzle(is);
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os << std::fixed << r << std::endl;
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}
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}
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int main(int argc, char * argv[])
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{
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try{
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if ( *++argv ) {
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std::ifstream ifs(*argv);
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read_input_and_solve( ifs, std::cout );
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} else {
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read_input_and_solve( std::cin, std::cout );
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}
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return 0;
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}
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catch (const std::exception& e)
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{
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std::cerr << std::endl
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<< "std::exception(\"" << e.what() << "\")." << std::endl;
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return 2;
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}
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catch (...)
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{
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std::cerr << std::endl
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<< "unknown exception." << std::endl;
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return 1;
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}
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}
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