运行 ID: 44651

Main.cc: In function ‘int main()’:
Main.cc:19:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
      if(a[i]=-1&&flag){
         ~~~~^~~~~~~~~
Main.cc:24:6: error: ‘else’ without a previous ‘if’
      else if(a[i]==-1&&flag==0){
      ^~~~
Main.cc:24:16: error: ‘i’ was not declared in this scope
      else if(a[i]==-1&&flag==0){
                ^