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Lỗi biên dịch:

Main.cc: In function ‘int Ktra(Test)’:
Main.cc:16:4: error: ‘itoa’ was not declared in this scope
    itoa(a.b[i],b,10);  
    ^~~~
Main.cc:16:4: note: suggested alternative: ‘Ktra’
    itoa(a.b[i],b,10);  
    ^~~~
    Ktra
Main.cc: In function ‘int main()’:
Main.cc:31:9: warning: unused variable ‘T’ [-Wunused-variable]
     int T;
         ^
Main.cc:30:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
Main.cc:35:11: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
      scanf("%d%d%d", &a[i].N, &a[i].L, &a[i].R);
      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cc:37:12: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &a[i].b[j]);
       ~~~~~^~~~~~~~~~~~~~~~~~