Submission #629647

#	Time	Username	Problem	Language	Result	Execution time	Memory
629647		Ronin13	Catfish Farm (IOI22_fish)	C++17	9 / 100	1099 ms	148200 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pll pair<ll,ll>
#define pii pair<int,int>
#define pb push_back
#define epb emplace_back
#define f first
#define s second
#include <vector>

using namespace std;

map<pii, ll> val;
map <pii, ll> dp;
map <pii, ll> DP;

long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,std::vector<int> W) {
    int n = N;
    int m = M;
    vector <set <int> > vec(n + 2);
    for(int i = 0; i < m; i++){
        vec[X[i] + 1].insert(Y[i] + 1);
        val[{X[i] + 1, Y[i] + 1}] = W[i];
    }
    for(int i = 0; i <= n + 1; i++){
        vec[i].insert(0);
        vec[i].insert(n);
    }
    for(int i = 1; i <= n + 1; i++){
        if(i > 1){
            set <int> :: reverse_iterator rit;
            int ind = 0;
            ll last = -1;
            for(rit = vec[i].rbegin(); rit != vec[i].rend(); rit++){
                int j = *rit;
                int a = *vec[i - 2].rbegin();
                int b = *vec[i - 2].begin();
                if(last == -1){
                    dp[{i, j}] = max(DP[{i - 2, a}] + val[{i, j}], dp[{i - 2, b}] + val[{i, j}]);
                }
                else{
                    int v = *vec[i - 1].upper_bound(j);
                    dp[{i, j}] = max(last + val[{i, j}], dp[{i - 1, v}] + val[{i, j}]);
                }
                last = dp[{i, j}];
            }
        }
        set <int> :: iterator it;
        ll last = -1;
        for(it = vec[i].begin(); it != vec[i].end(); it++){
            int j = *it;
            ll v = val[{i, j}];
            if(last == -1){
                int x = *vec[i - 1].begin();
                DP[{i, j}] = dp[{i - 1, x}] + v;
            }
            else{
                int x =*(--vec[i].lower_bound(j));
                DP[{i, j}] = max(DP[{i - 1, x}], last) + v;
            }
            last = DP[{i, j}];
        }
    }
    ll ans = DP[{n + 1, 0}];
    for(int i = 1; i <= n; i++){
        ans = max(ans, DP[{n, 0}]);
    }
    return ans;
}

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:34:17: warning: unused variable 'ind' [-Wunused-variable]
   34 |             int ind = 0;
      |                 ^~~

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