#include "fish.h"
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int N = 100010;
ll mat[N][2];
long long max_weights(int n, int m, std::vector<int> X, std::vector<int> Y,
std::vector<int> W) {
ll res = 0, ans = 0;
for(int i = 0;i < m;i++){
mat[Y[i]][X[i]] = W[i];
}
if(n == 2){
ll res = 0, res2 = 0;
for(int i = 0;i < N;i++){
res += mat[i][0];
res2 += mat[i][1];
}
return max(res, res2);
}
for(int i = 0;i < N;i++){
ans += mat[i][1];
}
for(int i = 0;i < N;i++){
res = max(res, ans);
ans -= mat[i][1];
ans += mat[i][0];
}
return max(res, ans);
}
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