foo.cc: In function 'void init()':
foo.cc:23:4: error: 'scanf' was not declared in this scope
   23 |    scanf("%d", &N);
      |    ^~~~~
foo.cc: In function 'void dpCal()':
foo.cc:58:4: error: 'printf' was not declared in this scope
   58 |    printf("第一行 %d\n", N - len);
      |    ^~~~~~
foo.cc:5:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
    4 | #include <algorithm>
  +++ |+#include <cstdio>
    5 | using namespace std;
foo.cc: In function 'void stepCal()':
foo.cc:84:4: error: 'printf' was not declared in this scope
   84 |    printf("第二行 %d\n", g[N]);
      |    ^~~~~~
foo.cc:84:4: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?

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