39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
#include <cstdio>
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#define max(a , b) ((a) > (b) ? (a) : (b))
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int LIS[55];
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int LDS[55];
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long long minlis[55];
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long long data[55];
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int binary(int l, int r , int x){
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int mid;
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while(l <= r){
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mid = (l + r) >> 1;
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if(minlis[mid] < x) l = mid + 1;
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else r = mid -1;
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}
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return l;
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}
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int main(){
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int n, maxn, len;
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while(~scanf("%d", &n) && n != 0){
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for(int i = 1; i <= n; i++) scanf("%lld", data + i);
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minlis[1] = data[1]; LIS[1] = 1; len = 1;
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for(int i = 2; i <= n; i++){
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LIS[i] = binary(1, len, data[i]);
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minlis[LIS[i]] = data[i];
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if(LIS[i] > len) len++;
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}
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minlis[1] = data[n]; LDS[n] = 1; len = 1;
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for(int i = n-1; i > 0; i--){
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LDS[i] = binary(1, len, data[i]);
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minlis[LDS[i]] = data[i];
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if(LDS[i] > len) len++;
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}
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maxn = 0;
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for(int i = 1; i <= n; i++)
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maxn = max(maxn , LIS[i] + LDS[i] - 1);
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printf("%d\n", n - maxn);
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}
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return 0;
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}
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