#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
long long dp[(int) 1e5 + 100]; // 0 -> block, 1 -> take the single , 2 -> take two
long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
map<int, long long> mp;
long long ans = 0;
for(int i = 0; i < M; ++i){
mp[X[i] + 1] += W[i];
}
dp[2] = max(mp[1], mp[2]);
dp[3] = max(mp[1] + mp[3], mp[2]);
for(int i = 4; i <= N; ++i){
dp[i] = max(mp[i - 1] + dp[i - 2], mp[i] + mp[i - 2] + dp[i - 3]);
if(i > 4){
dp[i] = max(dp[i], mp[i] + mp[i - 3] + dp[i - 4]);
}
}
return dp[N];
}
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