Submission #832494

#	Time	Username	Problem	Language	Result	Execution time	Memory
832494		NothingXD	Catfish Farm (IOI22_fish)	C++17	100 / 100	260 ms	87104 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

void debug_out(){cerr << endl;}
template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T){
	cerr << H << ' ';
	debug_out(T...);
}

#define debug(...) cerr << "(" << #__VA_ARGS__ << "): ", debug_out(__VA_ARGS__)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define MP(x, y) make_pair(x, y)

const int maxn = 3e5 + 10;

int n, m, x[maxn], y[maxn], w[maxn];
vector<int> num[maxn];
vector<int> val[maxn];
vector<ll> dp1[maxn], dp2[maxn], sum[maxn];
ll gole[maxn];

ll max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
	n = N, m = M;
	for (int i = 0; i < m; i++){
		x[i] = X[i];
		y[i] = Y[i];
		w[i] = W[i];
		num[x[i]].push_back(y[i]-1);
		num[x[i]].push_back(y[i]);
	}
//	debug(0);
	for (int i = 0; i < n; i++){
		num[i].push_back(-1);
		num[i].push_back(n-1);
		sort(all(num[i]));
		num[i].resize(distance(num[i].begin(), unique(all(num[i]))));
		for (auto x: num[i]){
			val[i].push_back(0);
		}
	}
	for (int i = 0; i < m; i++){
		int idx = lower_bound(all(num[x[i]]), y[i]) - num[x[i]].begin();
		val[x[i]][idx] = w[i];
	}
//	debug(1);
	dp1[0].resize(val[0].size(), 0);
	dp2[0].resize(val[0].size(), 0);
	sum[0].resize(val[0].size(), 0);
	for (int i = 1; i < val[0].size(); i++){
		dp1[0][i] = dp1[0][i-1] + val[0][i];
		sum[0][i] = sum[0][i-1] + val[0][i];
	}
	//gole[0] = 0;
//	for (int i = 0; i < val[0].size(); i++) debug(0, i, num[0][i], dp1[0][i], dp2[0][i], sum[0][i]);
	for (int i = 1; i < n; i++){
		dp1[i].resize(val[i].size());
		dp2[i].resize(val[i].size());
		sum[i].resize(val[i].size());
		for (int j = 0; j < val[i].size(); j++){
			int idx = upper_bound(all(num[i-1]), num[i][j]) - num[i-1].begin() - 1;
			dp1[i][j] = dp1[i-1][idx];
			if (j){
				dp1[i][j] = max(dp1[i][j], dp1[i][j-1] + val[i][j]);
			}
			if (i > 1){
				dp1[i][j] = max(dp1[i][j], dp2[i-1][0]);
				dp1[i][j] = max(dp1[i][j], dp2[i-2][0] + sum[i-1][idx]);
			}
		}
		for (int j = val[i].size()-1; ~j; j--){
		//	debug(i, j);
			int idx = lower_bound(all(num[i-1]), num[i][j]) - num[i-1].begin();
			dp2[i][j] = dp2[i-1][idx];
			if (j + 1 != val[i].size()) dp2[i][j] = max(dp2[i][j], dp2[i][j+1] + val[i][j+1]);
			if (i > 1){
			//	debug(1, dp1[i-2][val[i-2].size()-1]);
				dp2[i][j] = max(dp2[i][j], dp1[i-2][val[i-2].size()-1]);
			}
			if (i > 2){
				dp2[i][j] = max(dp2[i][j], dp2[i-2][0]);
				dp2[i][j] = max(dp2[i][j], dp2[i-3][0] + sum[i-2][val[i-2].size()-1]);
			}
		}
		for (int j = 1; j < val[i].size(); j++){
			sum[i][j] = sum[i][j-1] + val[i][j];
		}
	//	for (int j = 0; j < val[i].size(); j++) debug(i, j, num[i][j], dp1[i][j], dp2[i][j], sum[i][j]);
	}
	ll ans = max(dp2[n-1][0], dp1[n-2][val[n-2].size()-1]);
	return ans;
}

Compilation message (stderr)

fish.cpp: In function 'll max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:46:13: warning: unused variable 'x' [-Wunused-variable]
   46 |   for (auto x: num[i]){
      |             ^
fish.cpp:58:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |  for (int i = 1; i < val[0].size(); i++){
      |                  ~~^~~~~~~~~~~~~~~
fish.cpp:68:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |   for (int j = 0; j < val[i].size(); j++){
      |                   ~~^~~~~~~~~~~~~~~
fish.cpp:83:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |    if (j + 1 != val[i].size()) dp2[i][j] = max(dp2[i][j], dp2[i][j+1] + val[i][j+1]);
      |        ~~~~~~^~~~~~~~~~~~~~~~
fish.cpp:93:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |   for (int j = 1; j < val[i].size(); j++){
      |                   ~~^~~~~~~~~~~~~~~

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