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Cod sursa(job #676873)
#include<fstream>
using namespace std;
ifstream f("secv.in");
ofstream g("secv.out");
long long int v[5000],n,i,j,c_1,nr,c_3,c_2,c_5,x,c_4,y,ma;
int main()
{
f>>n;
nr=1;
c_4=5000;
ma=1;
for (i=1;i<=n;i++)
f>>v[i];
for (i=1;i<n;i++){
x=i;
y=nr;
nr=1;
for (j=i+1;j<=n;j++){
c_2=0;
if (v[x]+1==v[j]+1){
c_2=1;
c_1=1;
x=j;
}
if (c_1==1){
nr=nr+1;
c_3=c_3+1;
c_5=v[i];
}
if (c_2==1)
c_3=1;
}
if (c_3==0)
nr=nr-c_3;
if (nr>ma)
ma=nr;
}
if (nr==1)
g<<"-1";
else
g<<ma;
return 0;
}