oj.uz

Submission #936888

# Submission time Handle Problem Language Result Execution time Memory
936888 2024-03-03T01:41:48 Z william950615 Let's Win the Election (JOI22_ho_t3) C++14
56 / 100
 2500 ms 6236 KB 
#include<bits/stdc++.h>
using namespace std;

#define F first
#define S second
#define mkp make_pair
#define PH push
#define PB push_back
#define REP(i,N) for( int i = 0; i < (N); ++i )
#define FOR(i,a,b) for( int i = (a); i <= (b); ++i )
#define ALL(x) begin(x), end(x)
#define MEM(x) memset(x, 0, sizeof(x))

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<typename T>
using V=vector<T>;

void solve() {
	int N, K; cin >> N >> K;
	V<pll> vc(N+1);
	const ll INF = 1e18;
	FOR(i,1,N) cin >> vc[i].F >> vc[i].S;
	for( auto &i : vc ) if( i.S == -1 ) i.S = INF;

	sort( vc.begin()+1, vc.end(), [&]( auto&a, auto&b) {
			return a.S < b.S;
		});
	
	V<V<V<double>>> dp( 2, V<V<double>>( K+1, V<double>(K+1, 0) ));
	//double dp[ N+1 ][ K+1 ][ K+1 ];

	auto init = [&]() {
		for( auto &i : dp ) for( auto &j : i ) for( auto &k : j )
			k = INF;
		dp[ 0 ][ 1 ][ 0 ] = 0;
		dp[ 1 ][ 1 ][ 0 ] = 0;
	};

	auto do_dp = [&](int p) {
		double ans=INF;
		init();
		for( int i = 1; i <= N; ++i ) {
			for( int j = 1; j <= K; ++j ) {
				for( int k = 1; k <= K; ++k ) {
					dp[ i&1 ][ j ][ k ] = min({
						( j == 1 ? INF : dp[~i&1][j-1][k-1]+(1.0*vc[i].S/(j-1)) ), 
						dp[~i&1][j][k-1] + (1.0*vc[i].F/p),
						dp[~i&1][j][k]
					});
				}
			}
		}
		//fprintf(stderr, "ans:(%.16lf), p(%d)\n", ans, p );
		ans = min( dp[N&1][p][K], ans );
		return ans;
	};

	int l = 1, r = K;
	double ans = INF;
	while( r-l > 4 ) {
		int l1 = (l+l+r)/3, l2 = (l+r+r)/3;
		double ans1 = do_dp(l1);
		double ans2 = do_dp(l2);
		ans = min( {ans,ans1,ans2} );
		if( ans1 > ans2 ) 
			l=l1;
		else
			r=l2;
	}
	for( int i = l; i<=r; ++i ) 
		ans = min( ans, do_dp(i));

	cout << fixed << setprecision(10);
	cout << ans << '\n';
}

int main() {
	int T = 1;
#ifdef LOCAL
	freopen( "input.txt", "r", stdin);
	freopen( "output.txt", "w", stdout );
	cin >> T;
#else
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif
	while(T--) solve();

}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 65 ms 348 KB Output is correct
6 Correct 500 ms 844 KB Output is correct
7 Correct 2402 ms 1944 KB Output is correct
8 Execution timed out 2531 ms 3672 KB Time limit exceeded
9 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 65 ms 348 KB Output is correct
6 Correct 500 ms 844 KB Output is correct
7 Correct 2402 ms 1944 KB Output is correct
8 Execution timed out 2531 ms 3672 KB Time limit exceeded
9 Halted 0 ms 0 KB -

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 600 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 500 KB Output is correct

Subtask #4
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 600 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 500 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 1 ms 344 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct

Subtask #5
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 600 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 500 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 1 ms 344 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 1 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 1 ms 348 KB Output is correct
42 Correct 1 ms 348 KB Output is correct
43 Correct 5 ms 348 KB Output is correct
44 Correct 4 ms 348 KB Output is correct
45 Correct 13 ms 344 KB Output is correct
46 Correct 14 ms 344 KB Output is correct
47 Correct 25 ms 344 KB Output is correct
48 Correct 26 ms 348 KB Output is correct
49 Correct 40 ms 604 KB Output is correct
50 Correct 40 ms 604 KB Output is correct
51 Correct 65 ms 604 KB Output is correct
52 Correct 66 ms 600 KB Output is correct
53 Correct 25 ms 348 KB Output is correct
54 Correct 25 ms 344 KB Output is correct
55 Correct 25 ms 348 KB Output is correct
56 Correct 25 ms 372 KB Output is correct
57 Correct 25 ms 348 KB Output is correct
58 Correct 26 ms 348 KB Output is correct
59 Correct 25 ms 348 KB Output is correct
60 Correct 25 ms 348 KB Output is correct

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2570 ms 6236 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 65 ms 348 KB Output is correct
6 Correct 500 ms 844 KB Output is correct
7 Correct 2402 ms 1944 KB Output is correct
8 Execution timed out 2531 ms 3672 KB Time limit exceeded
9 Halted 0 ms 0 KB -