解法一：循环倒叙一个个找#include<bits/stdc++.h>#definef(i,s,e)for(inti=s;i<=e;i++)#definelllonglongusingnamespacestd;constintN=1e3+10,inf=0x3f3f3f3f;intmain(){intn,m;cin>>n>>m;for(inti=n;i>=1