#pragma GCC optimize("Ofast") #pragma GCC target("avx2") char*mmap(); #define rd_skip() while(*rp++>=48) #define rd(v) long v=0;{long _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;} #define rep(v,e) for(long v=0;va[i]){ w[wt++]=a[i]; } while(wsb[i]){ ++ws; } f[i]=wsa[i]){ w[wt++]=a[i]; } while(wsb[i]){ ++ws; } if(!f[i]&&!(ws