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Cod sursa(job #319269)
#include <stdio.h>
#define N 50005
struct oras
{
int a,b;
};
oras v[N];
int m,n,best;
void citire()
{
scanf("%d%d",&m,&n);
int i;
for (i=1; i<=n; i++)
scanf("%d%d",&v[i].a,&v[i].b);
}
int modul(int x)
{
if (x<0)
return -x;
return x;
}
void rezolvare()
{
int i,j;
for (i=1; i<=n; i++)
for (j=i+1; j<=n; j++)
if (v[i].b+modul(v[i].a-v[j].a)+v[j].b>best)
best=v[i].b+modul(v[i].a-v[j].a)+v[j].b;
printf("%d\n",best);
}
int main()
{
freopen("orase.in","r",stdin);
freopen("orase.out","w",stdout);
citire();
rezolvare();
return 0;
}