快讀板子

inline long long mx() { long long s = 0,w = 1; char ch = getchar(); while(ch < '0' || ch > '9') { if(ch == '-') w = -1; ch = getchar(); } while(ch >= '0' && ch <= '9') { s = s * 10 + (ch - '0'); ch = getchar(); } return s * w; }