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#define INT_MAX 2147483647
#define INT_MIN -2147483648

    int safe_add(int &sum, int a, int b) {
        if (abs(a)>INT_MAX-abs(b)) {
            cout << "overflow : " << a << "+" << b << endl;
            return 0;
        }
        
        sum = a + b;
        
        return 1;
    }