Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
76626 刘慕莀 13求1+2-3+4-5+……n的值 C++ Compile Error 0 MS 0 KB 233 2024-06-02 15:37:18

Tests(0/0):

Code:

#include<iostream> using namespace std; int main(){ int n,a=0; a+=1; cin>>n; for(int i=2;i<=n;i++){ if(i%2==0){ (1+n)*((n-1)/2)/2; }else{ ((1+n)*((n-1)/2)/2)-n; } } cout<<a<<" "<<b; return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:9:18: warning: statement has no effect [-Wunused-value]
   (1+n)*((n-1)/2)/2;
                  ^
Main.cc:11:25: warning: statement has no effect [-Wunused-value]
      ((1+n)*((n-1)/2)/2)-n;
                         ^
Main.cc:14:19: error: 'b' was not declared in this scope
     cout<