为什么too many or too few lines

#include #include #include using namespace std; const int MAXN=1e5+10; inline int read(){ int out=0; char c=getchar(); while(c<48||c>57) c=getchar(); while(c<=57&&c>=48){ out=(out<<1)+(out<<3)+c-48; c=getchar(); } return out; } inline void write(int x){ if(x>9) write(x/10); putchar(x%10+48); } int n; struct tree{ int c[MAXN]; inline int lowbit(int k){return k&-k;} void add(int k,int x){ while(k<=n){ c[k]+=x; k+=lowbit(k); } } int sum(int k){ int ret=0; while(k){ ret+=c[k]; k-=lowbit(k); } return ret; } int getsum(int r,int l){ return sum(r)-sum(l-1); } }t; int main(){ n=read(); int m=read(); for(int i=1;i<=m;++i){ char c=getchar(); if(c=='x'){ int k=read(); t.add(k,read()); } else{ write(t.getsum(read(),read())); putchar(10); } } return 0; }