Commit 3cf86e5

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	`1`	`+// https://youtu.be/L8grWxBlIZ4?t=9858`
	`2`	`+// https://youtu.be/ERZuLAxZffQ?t=4765`
	`3`	`+const int mod = 1000000007;`
	`4`	`+struct mint {`
	`5`	`+ ll x;`
	`6`	`+ mint(ll x=0):x(x%mod){}`
	`7`	`+ mint& operator+=(const mint a) {`
	`8`	`+ if ((x += a.x) >= mod) x -= mod;`
	`9`	`+ return *this;`
	`10`	`+ }`
	`11`	`+ mint& operator-=(const mint a) {`
	`12`	`+ if ((x += mod-a.x) >= mod) x -= mod;`
	`13`	`+ return *this;`
	`14`	`+ }`
	`15`	`+ mint& operator*=(const mint a) {`
	`16`	`+ (x *= a.x) %= mod;`
	`17`	`+ return *this;`
	`18`	`+ }`
	`19`	`+ mint operator+(const mint a) const {`
	`20`	`+ mint res(*this);`
	`21`	`+ return res+=a;`
	`22`	`+ }`
	`23`	`+ mint operator-(const mint a) const {`
	`24`	`+ mint res(*this);`
	`25`	`+ return res-=a;`
	`26`	`+ }`
	`27`	`+ mint operator*(const mint a) const {`
	`28`	`+ mint res(*this);`
	`29`	`+ return res*=a;`
	`30`	`+ }`
	`31`	`+};`

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