#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- int N; ll M,X; map S; void solve() { int i,j,k,l,r,x,y; string s; cin>>N>>M; FOR(i,N) { cin>>X; S[X%M]++; } ll ret=0; FORR2(a,b,S) { if(a==0||2*a==M) { ret++; } else { ret+=max(S[a],S[M-a]); S[a]=S[M-a]=0; } } cout<