#include "fish.h"
#include <vector>
#include <algorithm>
using namespace std;
#define ll long long
long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
ll can1 = 0;
ll can2 = 0;
for (int i = 0; i < M; i++) {
if (X[i] == 0)
can2 += W[i];
else
can1 += W[i];
}
if (N <= 2) {
return max(can1, can2);
} else {
vector<pair<int, int>> v;
for (int i = 0; i < M; i++) {
v.push_back({Y[i], i});
}
sort(v.begin(), v.end());
ll tmp = can1;
for (int i = 0; i < M;) {
int j = v[i].second;
if (i+1 < M && v[i].first == v[i+1].first) {
tmp += W[j];
tmp -= W[v[i+1].second];
i += 2;
} else if (X[j] == 0) {
tmp += W[j];
i++;
} else {
tmp -= W[j];
i++;
}
can1 = max(tmp, can1);
}
return can1;
}
}
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