Submission #632770

#	Time	Username	Problem	Language	Result	Execution time	Memory
632770		Joshua_Andersson	Catfish Farm (IOI22_fish)	C++17	0 / 100	602 ms	838320 KiB

fish

#include <bits/stdc++.h>
using namespace std;

#define _LOCAL 0
typedef long long ll;
#define inf ll(1e18)
typedef pair<ll, ll> p2;
typedef vector<ll> vi;
typedef vector<p2> vp2;
typedef vector<vp2> vvp2;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
#define rep(var, high) for (int var = 0; var < high; var++)

int N;

// What's the max score we can enter column col with given that the previous col prevcol high
ll solve(int col, int prevcol, int prevprevcol, ll score, vvp2& fishes, vvvi& dp)
{
	if (col >= fishes.size()) return score;
	ll& v = dp[col][prevcol+1][prevprevcol+1];
	if (v != -1) return score + v;

	ll ret = score;


	ll scorediff = 0;
	int curcolpointer = 0;
	int prevcolpointer = 0;
	int nextcolpointer = 0;

	// TODO: add 0  transition

	ret = max(ret, solve(col + 1, -1, prevcol, score, fishes, dp));

	// Build bridge to fishes[col+1][i].height
	for (int i = 0; i < N+1; i++)
	{
		// Add score if not taken
		while (col > 0 && prevcolpointer < fishes[col - 1].size() && fishes[col - 1][prevcolpointer].first <= i)
		{
			if (fishes[col - 1][prevcolpointer].first > prevcol && fishes[col - 1][prevcolpointer].first > prevprevcol) scorediff += fishes[col - 1][prevcolpointer].second;
			prevcolpointer++;
		}

		// Lose score in current column
		// First statement: only lose score for mated ones
		while (i <= prevcol && curcolpointer < fishes[col].size() && fishes[col][curcolpointer].first <= i)
		{
			scorediff -= fishes[col][curcolpointer].second;
			curcolpointer++;
		}

		if (col+1<fishes.size()&&nextcolpointer < fishes[col + 1].size() && fishes[col + 1][nextcolpointer].first <= i)
		{
			scorediff += fishes[col + 1][nextcolpointer].second;
			nextcolpointer++;
		}


		ret = max(ret, solve(col + 1, i, prevcol, score + scorediff, fishes, dp));
	}

	v = ret - score;
	return ret;
}

long long max_weights(int n, int m, std::vector<int> x, std::vector<int> y, std::vector<int> w)
{
	N = n;
	int maxy = 0;
	vvp2 fishes(n);
	rep(i, m)
	{
		maxy = max(maxy, y[i]);
		fishes[x[i]].emplace_back(y[i], w[i]);
	}
	rep(i, m) sort(fishes[i].begin(), fishes[i].end());
	vvvi dp(n, vvi(20, vi(20,-1)));

	return solve(0, -1, -1, 0, fishes, dp);
}

#if _LOCAL
int main()
{
	int n, m;
	cin >> n >> m;
	vector<int> x(m);
	vector<int> y(m);
	vector<int> w(m);

	rep(i, m)
	{
		cin >> x[i];
		cin >> y[i];
		cin >> w[i];
	}
	cout << max_weights(n, m,x,y, w);
}
#endif

Compilation message (stderr)

fish.cpp: In function 'll solve(int, int, int, ll, vvp2&, vvvi&)':
fish.cpp:20:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |  if (col >= fishes.size()) return score;
      |      ~~~~^~~~~~~~~~~~~~~~
fish.cpp:40:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |   while (col > 0 && prevcolpointer < fishes[col - 1].size() && fishes[col - 1][prevcolpointer].first <= i)
      |                     ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
fish.cpp:48:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |   while (i <= prevcol && curcolpointer < fishes[col].size() && fishes[col][curcolpointer].first <= i)
      |                          ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
fish.cpp:54:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |   if (col+1<fishes.size()&&nextcolpointer < fishes[col + 1].size() && fishes[col + 1][nextcolpointer].first <= i)
      |       ~~~~~^~~~~~~~~~~~~~
fish.cpp:54:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |   if (col+1<fishes.size()&&nextcolpointer < fishes[col + 1].size() && fishes[col + 1][nextcolpointer].first <= i)
      |                            ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16