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#include <iostream> using namespace std; int main() { int a, b, c, d; cin >> a >> b >> c >> d; int bez_a = b + c + d; int bez_b = a + c + d; int bez_c = a + b + d; int bez_d = a + b + c; int temporary_plus = 0; if(bez_a % 2 == 0) { temporary_plus++; } if(bez_b % 2 == 0) { temporary_plus++; } if(bez_c % 2 == 0) { temporary_plus++; } if(bez_d % 2 == 0) { temporary_plus++; } if(temporary_plus == 0) { cout << "-" << endl; } else if(temporary_plus == 1) { cout << "+" << endl; } else { cout << "?" << endl; } return 0; }
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