This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "fish.h"
#include <bits/stdc++.h>
#define fore(i, l, r) for(int i=int(l); i<int(r); i++)
using namespace std;
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
                      std::vector<int> W) {
  long long ok=1,ok1=1;
    fore(i,0,M) {
        if(X[i] % 2)
            ok=0;
        if(X[i] > 1)
            ok1=0;
    }
    long long ans=0;
    if(ok)
      fore(i,0,M)
        ans+=W[i];
    else if(ok1) {
      long long grid[2][N+5];
      memset(grid,0,sizeof grid);
      fore(i,0,M)
        grid[X[i]][Y[i]] = W[i];
      pair<long long,long long> p;
      long long sum1=0,sum2=0;
      fore(i,0,N) {
        sum1+=grid[0][i];
        sum2+=grid[1][i];
        if(sum1 >= sum2) {
          p = {sum1,sum2};
        }
      }
      ans = sum2-p.second+p.first;
    } 
    return ans;
}
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