29 lines
1,013 B
C++
29 lines
1,013 B
C++
struct node {
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int val;
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node* c[2];
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node() {
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val = 0;
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c[0] = c[1] = 0;
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}
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node* get_c(int i) { return (!c[i] ? c[i] = new node : c[i]); }
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void update(int x, int v, int l = 0, int r = -1) {
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if (r == -1) r = N - 1;
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if (l == r) val += v;
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else {
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int m = (l + r) >> 1;
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x <= m ? get_c(0)->update(x, v, l, m) : get_c(1)->update(x, v, m + 1, r);
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val = (c[0] ? c[0]->val : 0) + (c[1] ? c[1]->val : 0);
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}
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}
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long long query(int a, int b, int l = 0, int r = -1) {
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if (r == -1) r = N - 1;
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if (a > r || b < l) return 0;
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if (a <= l && b >= r) return val;
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int m = (l + r) >> 1;
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return (c[0] ? c[0]->query(a, b, l, m) : 0) + (c[1] ? c[1]->query(a, b, m + 1, r) : 0);
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}
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} FT[MX];
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void update(int x, int y, int v) { for (; x < N; x += x & -x) FT[x].update(y, v); }
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int query(int x, int y1, int y2) { int ret = 0; for (; x > 0; x -= x & -x) ret += FT[x].query(y1, y2); return ret; }
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int query(int x1, int x2, int y1, int y2) { return query(x2, y1, y2) - (x1 == 1 ? 0 : query(x1 - 1, y1, y2)); } |