#include "fish.h"
#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e9;
const int NN = 100001;
int max_weights(int32_t N, int32_t M, vector<int32_t> X,vector<int32_t> Y, vector<int32_t> W) {
vi pref(N+1,0),suf(N+1,0);
for (int i=0;i<M;i++) {
if (X[i] == 0) pref[Y[i]+1]+=W[i];
else suf[Y[i]+1]+=W[i];
}
for (int i=1;i<=N;i++) pref[i]+=pref[i-1];
for (int i = N-1;i>=0;i--) suf[i]+=suf[i+1];
int ans = 0;
for (int i = 0;i<N;i++) ans = max(ans,pref[i]+suf[i+1]);
ans = max(ans,suf[1]);
ans = max(ans,pref[N]);
return ans;
}
