Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
131878 李茗宇 13求1+2-3+4-5+……n的值 C++ Compile Error 0 MS 0 KB 368 2025-10-01 17:03:26

Tests(0/0):

Code:

#include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,s=1; cin>>n; for(int i=2;i<=n;i++){ if(i%2==0){ s=i+s; } else{ s=i-s; } } cout<<s; return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:8:5: error: 'cin' was not declared in this scope
     cin>>n;
     ^
Main.cc:17:5: error: 'cout' was not declared in this scope
     cout<