5306 ( Gorgeous Sequence )

思路：

吉司機(jī)線段樹

維護(hù)最大值和次大值，大于最大值不改，在最大值和次大值之間的直接修改，小于次大值遞歸修改。

代碼：

#pragma GCC optimize(2) #pragma GCC optimize(3) #pragma GCC optimize(4) #include<bits/stdc++.h> using namespace std; #define y1 y11 #define fi first #define se second #define pi acos(-1.0) #define LL long long #define ls rt<<1, l, m #define rs rt<<1|1, m+1, r //#define mp make_pair #define pb push_back #define ULL unsigned LL #define pll pair<LL, LL> #define pli pair<LL, int> #define pii pair<int, int> #define piii pair<pii, int> #define pdi pair<double, int> #define pdd pair<double, double> #define mem(a, b) memset(a, b, sizeof(a)) #define debug(x) cerr << #x << " = " << x << "\n"; #define fio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0); //head inline int read() {int a = 1, b = 0;char ch = getchar();while(ch < '0' || ch > '9') {if(ch == '-') a = -1;ch = getchar();}while('0' <= ch && ch <= '9') {b = b*10 + ch-'0';ch = getchar();}return a*b; }const int N = 1e6 + 5; int a[N], mx[N<<2], cnt[N<<2], se[N<<2], lazy[N<<2], n, m, op, x, y, t, T; LL sum[N<<2]; inline void push_up(int rt) {sum[rt] = sum[rt<<1] + sum[rt<<1|1];mx[rt] = max(mx[rt<<1], mx[rt<<1|1]);if(mx[rt<<1] > mx[rt<<1|1]) se[rt] = max(se[rt<<1], mx[rt<<1|1]), cnt[rt] = cnt[rt<<1];else if(mx[rt<<1] < mx[rt<<1|1]) se[rt] = max(se[rt<<1|1], mx[rt<<1]), cnt[rt] = cnt[rt<<1|1];else se[rt] = max(se[rt<<1], se[rt<<1|1]), cnt[rt] = cnt[rt<<1] + cnt[rt<<1|1]; } inline void push_down(int rt) {if(lazy[rt] < mx[rt<<1]) sum[rt<<1] -= (mx[rt<<1] - lazy[rt])*1LL*cnt[rt<<1], mx[rt<<1] = lazy[rt], lazy[rt<<1] = lazy[rt];if(lazy[rt] < mx[rt<<1|1]) sum[rt<<1|1] -= (mx[rt<<1|1] - lazy[rt])*1LL*cnt[rt<<1|1], mx[rt<<1|1] = lazy[rt], lazy[rt<<1|1] = lazy[rt];lazy[rt] = 0; } void build(int rt, int l, int r) {lazy[rt] = 0;if(l == r) {sum[rt] = mx[rt] = a[l];se[rt] = -1;cnt[rt] = 1;return ;}int m = l+r >> 1;build(ls);build(rs);push_up(rt); } void update(int L, int R, int x, int rt, int l, int r) {if(mx[rt] <= x) return ;if(L <= l && r <= R) {if(l == r) {sum[rt] = mx[rt] = x;se[rt] = -1;cnt[rt] = 1;return ;}if(se[rt] < x && x < mx[rt]) {sum[rt] -= (mx[rt] - x)*1LL*cnt[rt];mx[rt] = x;lazy[rt] = x;}else {int m = l+r >> 1;if(lazy[rt]) push_down(rt);update(L, R, x, ls);update(L, R, x, rs);push_up(rt);}return ;}int m = l+r >> 1;if(lazy[rt]) push_down(rt);if(L <= m) update(L, R, x, ls);if(R > m) update(L, R, x, rs);push_up(rt); } LL querysum(int L, int R, int rt, int l, int r) {if(L <= l && r <= R) return sum[rt];int m = l+r >> 1;LL ans = 0;if(lazy[rt]) push_down(rt);if(L <= m) ans += querysum(L, R, ls);if(R > m) ans += querysum(L, R, rs);push_up(rt);return ans; } int querymx(int L, int R, int rt, int l, int r) {if(L <= l && r <= R) return mx[rt];int m = l+r >> 1;int ans = 0;if(lazy[rt]) push_down(rt);if(L <= m) ans = max(ans, querymx(L, R, ls));if(R > m) ans = max(ans, querymx(L, R, rs));push_up(rt);return ans; } int main() {T = read();while(T--) {n = read(); m = read();for (int i = 1; i <= n; ++i) a[i] = read();build(1, 1, n);for (int i = 1; i <= m; ++i) {op = read();if(op == 0) {x = read();y = read();t = read();update(x, y, t, 1, 1, n);}else if(op == 1) {x = read();y = read();printf("%d\n", querymx(x, y, 1, 1, n));}else {x = read();y = read();printf("%lld\n", querysum(x, y, 1, 1, n));}}}return 0; }

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轉(zhuǎn)載于:https://www.cnblogs.com/widsom/p/10770416.html

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