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template<typename T> struct segtree {
T seg[4*MN], tmp[4*MN];
inline T pull(const T & a, const T & b) { return a+b; }
inline void push(int l, int r, int n) {
seg[n] += (r-l+1)*tmp[n];
if (l != r) tmp[n<<1] += tmp[n], tmp[n<<1|1] += tmp[n];
tmp[n] = 0;
}
void build(T v, int l = 0, int r = -1, int n = 1) {
if (r == -1) r = N-1;
if (l == r) seg[n] = v;
else {
int m = (l+r)>>1;
build(l, m, n<<1), build(m+1, r, n<<1|1);
seg[n] = pull(seg[n<<1], seg[n<<1|1]);
}
}
void update(int x, T v, int l = 0, int r = -1, int n = 1) {
if (r == -1) r = N-1;
if (l == r) seg[n] += v;
else {
int m = (l+r)>>1;
x <= m ? update(x, v, l, m, n<<1) : update(x, v, m+1, r, n<<1|1);
seg[n] = pull(seg[n<<1], seg[n<<1|1]);
}
}
void update(int a, int b, T v, int l = 0, int r = -1, int n = 1) {
if (r == -1) r = N-1;
push(l, r, n);
if (l > r || l > b || r < a) return;
if (l >= a && r <= b) {
tmp[n] += v;
push(l, r, n);
}
else {
int m = (l+r)>>1;
update(a, b, v, l, m, n<<1), update(a, b, v, m+1, r, n<<1|1);
seg[n] = pull(seg[n<<1], seg[n<<1|1]);
}
}
T query(int a, int b, int l = 0, int r = -1, int n = 1) {
if (r == -1) r = N - 1;
if (a > b || l > b || r < a) return 0;
push(l, r, n);
if (l >= a && r <= b) return seg[n];
int m = (l+r)>>1;
return pull(query(a, b, l, m, n<<1), query(a, b, m+1, r, n<<1|1));
}
}
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