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  • BZOJ1996: [Hnoi2010]chorus 合唱队 (DP)

    就是想水一发

    #include <stdio.h>
    #include <algorithm>
    #include <iostream>
    using namespace std;
    typedef long long ll;
    const ll mod = 19650827;
    int q[1005];
    ll dp[1005][1005][2];
    
    int main()
    {
        int n; scanf("%d", &n);
        for(int i = 1; i <= n; i++) scanf("%d", &q[i]), dp[i][i][0] = 1;
    
        for(int len = 2; len <= n; len++)
        {
            for(int i = 1; i + len - 1 <= n; i++)
            {
                int j = i + len - 1;
                if(q[j] > q[j - 1]) dp[i][j][1] = (dp[i][j][1] + dp[i][j - 1][1]) % mod;
                if(q[j] > q[i]) dp[i][j][1] = (dp[i][j][1] + dp[i][j - 1][0]) % mod;
                if(q[i] < q[i + 1]) dp[i][j][0] = (dp[i][j][0] + dp[i + 1][j][0]) % mod;
                if(q[i] < q[j]) dp[i][j][0] = (dp[i][j][0] + dp[i + 1][j][1]) % mod;
            }
        }
        printf("%lld
    ", (dp[1][n][0] + dp[1][n][1]) % mod);
        return 0;
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/lwqq3/p/9223995.html
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