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Cod sursa(job #586353)
#include<fstream>
using namespace std;
ifstream f("orase.in");
ofstream g("orase.out");
int main()
{int i,m,n,d[50000],l[50000],sol,smax,s1,s2,v[100000];
f>>m>>n;
sol=-int(2e9);
for(i=1;i<=n;i++)
{f>>d[i]>>l[i]; v[d[i]]=l[i];}
sort(d+1,d+n+1);
for(i=1;i<=n-1;i++)
{s1=d[n]-d[i]; s2=v[d[n]]+v[d[i]]; smax=s1+s2;
if(smax>sol) sol=smax; }
g<<sol;
return 0;
}