#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
std::vector<int> W) {
vector<ll> dp1(N), dp2(N);
vector<ll> c(N);
for (int i = 0; i < M; ++i) {
c[X[i]] += W[i];
}
dp1[0] = 0;
dp2[0] = c[0];
for (int i = 1; i < N; ++i) {
dp2[i] = max(dp2[i], dp1[i - 1] + c[i]);
dp1[i] = max(dp1[i], dp2[i - 1]);
}
return max(dp1[N - 1], dp2[N - 1]);
}
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