Submission #3457045
Source Code Expand
// template version 1.3
// {{{ define basic macro
using namespace std;
#include <iostream>
#include <bits/stdc++.h>
#define _overload3(_1,_2,_3,name,...) name
#define _rep(i,n) repi(i,0,n)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);++i)
#define rep(...) _overload3(__VA_ARGS__,repi,_rep,)(__VA_ARGS__)
#define _rrep(i,n) rrepi(i,0,n)
#define rrepi(i,a,b) for(int i=(int)(b-1);i>=(int)(a);--i)
#define rrep(...) _overload3(__VA_ARGS__,rrepi,_rrep,)(__VA_ARGS__)
#define all(x) (x).begin(),(x).end()
#define sum(v) accumulate(all(v), 0LL)
#define sz(x) ((int)(x).size())
#define pb(a) push_back(a)
#define mp(a, b) make_pair(a, b)
#define uni(x) sort(all(x));x.erase(unique(all(x)),x.end())
#define ten(n) ((int)1e##n)
template<class T, size_t N> size_t sza(const T (&array)[N]) { return N; }
template<class T> inline void chmax(T &a, const T &b) { if(a < b) a = b; }
template<class T> inline void chmin(T &a, const T &b) { if(a > b) a = b; }
template<class T=int> T in() {T x; cin>>x; return (x);}
struct Fast {
Fast(){
std::cin.tie(0);
ios::sync_with_stdio(false);
}
} fast;
// dump macro
#ifdef PCM
#include "dump.hpp"
#else
#define dump(...) 42
#define dump_1d(...) 42
#define dump_2d(...) 42
#endif
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef long double ld;
typedef pair<int,int> pii;
typedef tuple<int,int,int> iii;
template<typename T> using PQ = priority_queue<T, vector<T>, greater<T>>;
int dx[]={1, -1, 0, 0};
int dy[]={0, 0, 1, -1};
#define fi first
#define se second
// }}}
// varible setting{{{
#define infile "../test/sample-1.in"
#define int long long
#define INF 1000000000000000000LL
// #define INF 2147483647
#define MOD 1000000007LL
// }}}
int w[1005];
int p[1005];
int n,k;
int W;
bool isright(int z){
double y[n];
double x = (double)z/W;
dump(x);
rep(i, n){
y[i] = w[i]*(p[i]-x);
}
sort(y, y+n);
reverse(y, y+n);
double sum = 0;
rep(i, k){
sum += y[i];
}
if (sum>=0) return false;
else return true;
}
int solve(){
cin>>n>>k;
rep(i, n){
cin>>w[i]>>p[i];
}
W = accumulate(w, w+n, 0LL);
int left = 0;
int right = 1e14 + 5;
while (right-left>1){
int mid = (right+left)/2;
if (isright(mid)) { right = mid;}
else{ left = mid; }
}
// cout << (double)left / W << endl;
printf("%.9f", (double)left / W);
return 0;
}
signed main() { //{{{
#ifdef INPUT_FROM_FILE
std::ifstream in(infile);
std::cin.rdbuf(in.rdbuf());
#endif
solve();
return 0;
} //}}}
Submission Info
Submission Time |
|
Task |
D - 食塩水 |
User |
kjnh10 |
Language |
C++14 (GCC 5.4.1) |
Score |
100 |
Code Size |
2513 Byte |
Status |
AC |
Exec Time |
3 ms |
Memory |
256 KB |
Judge Result
Set Name |
Sample |
All |
Score / Max Score |
0 / 0 |
100 / 100 |
Status |
|
|
Set Name |
Test Cases |
Sample |
s0.txt, s1.txt |
All |
000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, s0.txt, s1.txt |
Case Name |
Status |
Exec Time |
Memory |
000.txt |
AC |
3 ms |
256 KB |
001.txt |
AC |
1 ms |
256 KB |
002.txt |
AC |
3 ms |
256 KB |
003.txt |
AC |
1 ms |
256 KB |
004.txt |
AC |
3 ms |
256 KB |
005.txt |
AC |
3 ms |
256 KB |
006.txt |
AC |
3 ms |
256 KB |
007.txt |
AC |
3 ms |
256 KB |
008.txt |
AC |
3 ms |
256 KB |
009.txt |
AC |
1 ms |
256 KB |
010.txt |
AC |
3 ms |
256 KB |
011.txt |
AC |
2 ms |
256 KB |
012.txt |
AC |
3 ms |
256 KB |
013.txt |
AC |
2 ms |
256 KB |
014.txt |
AC |
3 ms |
256 KB |
015.txt |
AC |
2 ms |
256 KB |
016.txt |
AC |
3 ms |
256 KB |
017.txt |
AC |
2 ms |
256 KB |
018.txt |
AC |
3 ms |
256 KB |
019.txt |
AC |
2 ms |
256 KB |
s0.txt |
AC |
1 ms |
256 KB |
s1.txt |
AC |
1 ms |
256 KB |