#include "fish.h"
#include <vector>
#include <iostream>
using namespace std;
int const N=1e5+10;
long long pre[2][N]={};
// 0 if we are updating it from behind 1 if being updated from
long long max_weights(int N, int M, vector<int> X, vector<int> Y,vector<int> W)
{
for (int i=0;i<M;i++)
pre[X[i]][Y[i]+1]=W[i];
for (int i=0;i<2;i++)
for (int j=1;j<=N;j++)
pre[i][j]+=pre[i][j-1];
if (N==2)
{
return max(pre[0][N],pre[1][N]);
}
long long ans=max(pre[0][N],pre[1][N]);
for (int i=0;i<=N;i++)
{
ans=max(ans,pre[0][i]+pre[1][N]-pre[1][i]);
}
return ans;
}
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