运行 ID: 26839

Main.cc:13:10: error: ‘::main’ must return ‘int’
 int main() {
          ^
Main.cc: In function ‘int main()’:
Main.cc:22:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &_);
     ~~~~~^~~~~~~~~~~~
Main.cc:24:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld%lld%lld", &n, &m, &K);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~