51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
#include <cstdio>
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#include <cstring>
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#include <algorithm>
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using namespace std;
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#define ll long long
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int const MAX = 2147483647;
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ll a[105], b[105];
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int re[105];
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int main()
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{
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int n, ca = 1;
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while(scanf("%d", &n) != EOF)
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{
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memset(re ,0 , sizeof(re));
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int ans = 0;
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for(int i = 1; i <= n; i++)
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scanf("%I64d", &a[i]);
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sort(a + 1, a + n + 1);
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int cnt = 0, pos = 1;
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a[n + 1] = -1;
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for(int i = 1; i <= n; i++)
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{
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if(a[i] == a[i + 1])
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cnt++;
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else
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{
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b[pos] = a[i];
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re[pos++] = cnt;
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if(i != n)
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cnt = 0;
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}
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}
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if(cnt == n - 1)
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{
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printf("Case #%d: -1\n", ca++);
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continue;
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}
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b[0] = b[pos-1];
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b[pos] = b[1];
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re[0] = re[pos-1];
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re[pos] = re[1];
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for(int i = 1; i < pos; i++)
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if((b[i] + b[i - 1]) % MAX == b[i + 1])
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{
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ans ++;
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ans += re[i];
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}
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printf("Case #%d: %d\n", ca++, ans);
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}
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}
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