#include<iostream> #include<cmath> #include<vector> using namespace std; int des5_3=0; vector<int>vec; bool dfs(int i,int des) { if(i==vec.size()) { return abs(des)==des5_3; } else { return dfs(i+1,des+vec[i])||dfs(i+1,des-vec[i]); } } ...