問題：B - A±B Problem #include <cstdio> #include <iostream> using namespace std; int main(void) { int a, b, c; scanf ("%d %d %d", &a, &b, &c); if (a + b == c && a - b == c) { printf ("?\n"); } else if (a + b == c) { printf ("+\n"); } else if (a - b == c) { </iostream></cstdio>…