Submission #832212

#	Time	Username	Problem	Language	Result	Execution time	Memory
832212		ymm	Catfish Farm (IOI22_fish)	C++17	100 / 100	154 ms	34044 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= l; --x)
typedef long long ll;
using namespace std;

const int N = 100'032;

struct fish {
	int pos = 0;
	int weight = 0;
	ll dpu = 0;
	ll dpd = 0;

	fish() {}
	fish(int x) : pos(x) {}
	fish(int x, int w) : pos(x), weight(w) {}
	bool operator<(const fish &f) const { return pos < f.pos; }
};

vector<fish> a[N];

fish &nxt_up(vector<fish> &vec, fish &cur) { return *upper_bound(vec.begin(), vec.end(), cur); }
fish &nxt_do(vector<fish> &vec, fish &cur) { return *--lower_bound(vec.begin(), vec.end(), cur); }

long long max_weights(int n, int m, std::vector<int> X, std::vector<int> Y,
                      std::vector<int> W) {
	Loop (i,0,m)
		a[X[i]].push_back(fish(Y[i], W[i]));
	Loop (i,0,n) {
		a[i].push_back(fish(-1));
		a[i].push_back(fish(n));
		sort(a[i].begin(), a[i].end());
	}
	LoopR (i,0,n) {
		a[i].front().dpd = (i+1 < n? a[i+1].front().dpu: 0);
		if (i+2 < n)
			a[i].front().dpd = max(a[i].front().dpd, a[i+2].back().dpd);
		Loop (j,1,a[i].size()) {
			a[i][j].dpd = nxt_do(a[i], a[i][j]).dpd;
			if (i+1 < n)
				a[i][j].dpd = max(a[i][j].dpd, nxt_do(a[i+1], a[i][j]).dpd);
			a[i][j].dpd += a[i][j].weight;
		}
		if (i == n-1)
			continue;
		a[i].back().dpu = (i+2 < n? a[i+2].back().dpd: 0);
		LoopR (j,0,a[i].size()-1) {
			a[i][j].dpu = nxt_up(a[i], a[i][j]).dpu;
			if (i+1 < n)
				a[i][j].dpu = max(a[i][j].dpu, nxt_up(a[i+1], a[i][j]).dpu);
			a[i][j].dpu += a[i][j].weight;
		}
	}
	return max(a[0].front().dpu, a[1].back().dpd);
}

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:3:40: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<fish>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    3 | #define Loop(x,l,r) for (ll x = (l); x < (r); ++x)
      |                                        ^
fish.cpp:40:3: note: in expansion of macro 'Loop'
   40 |   Loop (j,1,a[i].size()) {
      |   ^~~~

• 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