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