sign.cpp

// NOTE: it is recommended to use this even if you don't understand the following code.

#include <iostream>
#include <fstream>
#include <algorithm>

using namespace std;

int main() {
//  uncomment the following lines if you want to read/write from files
	ifstream cin("input.txt");
	ofstream cout("output.txt");

    int T;
    cin >> T;

    for (int i=0; i<T; i++) {
        long long A, B;
        cin >> A >> B;
        
        if (A==B) {
        	if (A > 0) {
        		cout << '+' << endl;
			} else if (A < 0) {
				cout << '-' << endl;
			} else {
				cout << '0' << endl;
			}
		
		} else if (A>0 && B>0) {
			cout << '+' << endl;
		} else if (A<=0 && B>=0) {
			cout << '0' << endl;
		} else if (A<0 && B<0) {
			if ((abs(B)-abs(A)+1)%2 ==0) {
				cout << '+' << endl;
			} else {
				cout << '-' << endl;
			}
		}
        
    }

    return 0;
}