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Cod sursa(job #446756)
#include<fstream>
using namespace std;
ifstream in("orase.in");
ofstream out("orase.out");
int v[50001][3];
int main()
{
long n,m,suma=0,smax=0,i,j;
in>>m>>n;
for(i=1;i<=n;i++)
in>>v[i][1]>>v[i][2];
for(i=1;i<=n;i++)
for(j=i+1;j<=n;j++)
{
suma=0;
suma=v[i][2]+v[j][2];
if(v[j][1]>v[i][1])
suma=suma+v[j][1]-v[i][1];
else
if(v[j][1]<v[i][1])
suma=suma+v[i][1]-v[j][1];
if(suma>smax)
smax=suma;
}
out<<smax<<'\n';
return 0;
}