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Cod sursa(job #418378)
#include<fstream>
using namespace std;
int a[100],n,m,i,s=-1;
int main()
{
ifstream f("secventa.in");
ofstream g("secventa.out");
f>>n;
for(i=1;i<=n;i++)
f>>a[i];
if(a[1]<a[2]&&a[2]>a[3])
s=s+a[1];
else
s=s+a[3];
for(i=3;i<=n;i++)
{
if(a[i]<a[i+1]&&a[i+1]>a[i+2])
s=s+a[i];
else
s=s+a[i+2];
}
g<<s;
return 0;
}