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#define lowbit(x) x & -x //1D void add(int x,int t) { while(x <= n) { v[x] += t; x += lowbit(x); } } int query(int x) { int res = 0; while(x) { res += v[x]; x -= lowbit(x); } return res; } //2D n * m void add(int x,int y,int t) { while(x <= n) { for(int k = y;k <= m;k += lowbit(k)) v[x][k] += t; x += lowbit(x); } } int query(int x,int y) { int res = 0; while(x) { for(int k = y;k;k -= lowbit(k)) res += v[x][k]; x -= lowbit(x); } return res; } |
