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#include <bits/stdc++.h> using namespace std; int n, k, v[1000005], ans; int main(){ ifstream fin("3secv.in"); ofstream fout("3secv.out"); fin>>n>>k; for(int i=1; i<=n; i++){ fin>>v[i]; v[i]+=v[i-1]; for(int j=0; j<i; j++){ if((v[i]-v[j])%3==k){ ans++; } } } fout<<ans; return 0; }
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