#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
ll dp[N][2], f[N] = {};
for (int i = 0; i < N; i++) {
dp[i][0] = dp[i][1] = 0;
}
for (int i = 0; i < M; i++) {
f[X[i]] = W[i];
}
for (int i = 1; i < N; i++) {
dp[i][0] = max(dp[i][0], dp[i - 1][0]);
dp[i][0] = max(dp[i][0], dp[i - 1][1] + f[i]);
dp[i][1] = max(dp[i][1], dp[i - 1][0] + f[i - 1]);
dp[i][1] = max(dp[i][1], dp[i - 1][1]);
}
return max(dp[N - 1][0], dp[N - 1][1]);
}
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