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ll sum2(ll l,ll r){ ll wa = (l+r)%mod; ll sa = (r-l+1)%mod; return wa*sa/2%mod; } とか書いて間違えた。両方奇数になるかもだからmod_inv(2,mod)を使わないといけないのね
これ辺の情報が与えられてグラフになったら、どうやって解くんだろうか。ICカード買うかを全通りためすんだろか atcoder.jp/contests/joi20…
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