17 lines
440 B
C++
17 lines
440 B
C++
#include <cstdio>
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#include <algorithm>
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using namespace std;
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int const N = 200010;
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int m, n, c[N], l, dp[N], i, j;
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int main() {
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while(~scanf("%d%d", &m, &n)) {
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for(j=1; j<=m; c[j++]=dp[n])
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for(i=2, scanf("%d", &dp[1]); i<=n && scanf("%d", &l); i++)
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dp[i] = max(dp[i-2]+l, dp[i-1]);
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for(i=2, dp[1]=c[1]; i<=m; i++)
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dp[i] = max(dp[i-2]+c[i], dp[i-1]);
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printf("%d\n", dp[m]);
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}
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return 0;
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}
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