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#include <iostream> #include <cstring> using namespace std; int a,n,k; int x[100]; int dp[1005][1005]; int f(int idx, int at) { if(idx==k) { return at; } if(dp[idx][at]!=-1) { return dp[idx][at]; } int rez=-1e9; if(at-x[idx]>=0) { rez=max(rez, f(idx+1, at-x[idx])); } if(at+x[idx]<=n) { rez=max(rez, f(idx+1, at+x[idx])); } return dp[idx][at]=rez; } int main() { cin>>a>>n; cin>>k; memset(dp,-1,sizeof dp); for(int i=0;i<k;i++) { cin>>x[i]; } if(f(0, a) < 0) cout << -1<<endl; else cout << f(0, a) << endl; return 0; }
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