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P1164 小A点菜 洛谷
阅读量:290 次
发布时间:2019-03-01

本文共 1131 字,大约阅读时间需要 3 分钟。

??????????0-1?????????????????????????????????????????????????????????????????????M?

????

  • ??????????????????????????M????????????????0-1????????
  • ??????????????????????????dp[j]?????????????????j??????????dp[0] = 1???????0?????????????????
  • ???????????a_i?????????dp?????????j??M?a_i?????dp[j] += dp[j - a_i]????????????????????????
  • ??????????????????????????????
  • ????

    #include 
    #include
    #include
    #include
    #include
    using namespace std;int main() { int n, m; while (cin >> n >> m) { int a[2000]; for (int i = 0; i < n; ++i) { cin >> a[i]; } long long dp[m + 1] = {0}; dp[0] = 1; for (int i = 0; i < n; ++i) { int current = a[i]; for (int j = m; j >= current; --j) { dp[j] += dp[j - current]; } } cout << dp[m] << endl; }}

    ????

  • ???????n?m???????n???????
  • ?????????????????m+1???dp?????0?dp[0] = 1??????0???????
  • ??dp??????????????????m????????dp????????????????
  • ?????dp[m]??????M???????????
  • ???????????????????????????????????????????

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