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- #include <cstdio>
- #define FOR(i,a,b) for(i=a; i<=b; i++)
- using namespace std;
- int solve()
- {
- int N,a,f,i,s,t;
- scanf("%d",&N);
- scanf("%d %d",&f,&s);
- a = s;
- FOR(i,3,N)
- {
- t = s;
- s = 2 * a - f;
- f = 2 * a - t;
- scanf("%d",&a);
- if(a < f) return 0;
- if(a < s) s = a;
- }
- return s - f + 1;
- }
- int main()
- {
- printf("%d\n" , solve() );
- return 0;
- }
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