C++ 等式最大值计算

#include\u0020 #include\u0020 using\u0020namespace\u0020std;

int\u0020main()\u0020{ int\u0020A, B, C, D; cin\u0020>>\u0020A\u0020>>\u0020B\u0020>>\u0020C\u0020>>\u0020D;

int\u0020ans\u0020=\u00200; ans\u0020=\u0020max(ans, (A - B) * (C + D)); ans\u0020=\u0020max(ans, (A - C) * (B + D)); ans\u0020=\u0020max(ans, (A - D) * (B + C));

cout\u0020<<\u0020ans\u0020<<\u0020endl;

return\u00200; }