C++ 代码

#include <iostream>
#include <vector>
using namespace std;

int compute(int i, int j)
{
    int a_i, a_j, res = 0;
    int n = j - i + 1;
    if(i % 2 == 0) a_i = i;
    else a_i = -i;
    if(j % 2 == 0) a_j = j;
    else a_j = -j;
    if(n % 2 == 0)
    {
        if(a_i < 0)
        {
            res = n / 2;
        }
        else{
            res = -1 * (n / 2);
        }
    }
    else{
        if(a_i < 0)
        {
            res = n / 2 + a_j;
        }
        else{
            res = -1 * (n / 2) + a_j;
        }
    }
    return res;
}

int main()
{
    int n;
    cin >> n;
    vector<vector<int>> a(n, vector<int>(2));
    vector<int> res(n);
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < 2; j++)
        {
            cin>>a[i][j];
        }

    }

    for(int i = 0; i < n; i++)
    {
        res[i] = compute(a[i][0], a[i][1]);
        cout<<res[i]<<endl;
    }
    return 0;
}