先给一个坤++介绍
坤++简介

#include<bits/stdc++.h>
#define I using
#define am namespace
#define KunKun std
#define IKUN int
#define caixukun main
#define kunin cin
#define kunout cout
#define jinitaimei 0;
#define kunfor for
#define kunwhile while
#define kunif if
#define kunelse else
I am KunKun;
IKUN caixukun(){
    IKUN cai,xu,kun;//定义
    kunin>>cai>>xu>>kun;//输入
    kunif((cai+xu)>kun&&(cai+kun)>xu&&(xu+kun)>cai)//判定条件（任意两边之和大于第三边）
        kunout<<"yes";
    kunelse
        kunout<<"no";
	return jinitaimei;
}

真能用哦~