Submission #718898

#	Time	Username	Problem	Language	Result	Execution time	Memory
718898		vinnipuh01	Let's Win the Election (JOI22_ho_t3)	C++17	100 / 100	195 ms	2296 KiB

Main

#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>
#define int double
#define sqrt sqrtl

using namespace std;

const long long oo = 1e9;

double sum, ans = 0, mx = 0, mn = 1000000000, num, pos;


/*
    ViHHiPuh

   (( `'-""``""-'` ))
     )-__-_.._-__-(
   / --- (o _ o) --- \
   \ .-* ( .0. ) *-. /
   _'-. ,_ '=' _, .-'_
  / `;#'#'# - #'#'#;` \
 \_)) -----'#'----- ((_/
      # --------- #
  '# ------- ------ #'
  /..-'# ------- #'-.\
  _\...-\'# -- #'/-.../_
  ((____)- '#' -(____))


    cout << fixed << setprecision(6) << x;


    freopen ( "sum.in", "r", stdin )
*/

long long n, m;
pair<int, int> a[ 501 ];
int dp[ 501 ][ 501 ];


main () {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n >> m;
	for ( long long i = 1; i <= n; i ++ ) {
		cin >> a[ i ].second >> a[ i ].first;
		if ( a[ i ].first == -1 )
			a[ i ].first = oo;
	}
	for ( long long i = 1; i <= n; i ++ )	
		dp[ 0 ][ i ] = oo;
	ans = oo;
	sort( a + 1, a + n + 1 );
	for ( long long k = 0; k <= m; k ++ ) {
		for ( long long i = 1; i <= n; i ++ ) {
			for ( long long j = 1; j <= n; j ++ )
				dp[ i ][ j ] = oo;
		}
		for ( long long i = 1; i <= n; i ++ ) {
			num = i;
			if ( num <= k )
				dp[ i ][ 0 ] = dp[ i - 1 ][ 0 ] + a[ i ].first / num;
			else
				dp[ i ][ 0 ] = dp[ i - 1 ][ 0 ];
			for ( long long j = 1; j <= min( i, m ); j ++ ) {
				num = i - j;
				if ( num <= k )
					dp[ i ][ j ] = min( dp[ i - 1 ][ j - 1 ] + a[ i ].second / ( k + 1 ), dp[ i - 1 ][ j ] + a[ i ].first / num );
				else
					dp[ i ][ j ] = min( dp[ i - 1 ][ j - 1 ] + a[ i ].second / ( k + 1 ), dp[ i - 1 ][ j ] );
//				cout << k << " " << i << " " << j << " - " << dp[ i ][ j ] << " " << num << "\n";
			}
		}
//		cout << k << " - " << dp[ n ][ m - k ] << "\n";
		ans = min( ans, dp[ n ][ m - k ] );
	}
	cout << fixed << setprecision(4) << ans;
}

Compilation message (stderr)

Main.cpp:50:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   50 | main () {
      | ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 33 / 33
• Subtask 6: 11 / 11
• Subtask 7: 23 / 23