dpp[i]=dpp[i-1]+(sum[i-1]*i%mod-dp2[i-1]+mod)*a[i]%mod+(i)*a[i]%mod*a[i]%mod; dp[i]=dp[i-1]+a[i]*a[i]%mod*i%mod+(sum[i-1]*i%mod-dp2[i-1]+mod)*a[i]%mod+dpp[i-1]; C题这两行是啥意思啊 菜鸡没看懂😭
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