teamnote history merge

2025fall/source/DP/DnC.cpp

@@ -0,0 +1,12 @@
+//D[t][s...e]를 구해야 하고, j의 탐색 범위는 [l, r]
+void f(int t, int s, int e, int l, int r){
+    if(s > e) return;
+    int m = s + e >> 1;
+    int opt = l;
+    for(int i=l; i<=r; i++){
+        if(D[t-1][opt] + C[opt][m] > D[t-1][i] + C[i][m]) opt = i;
+    }
+    D[t][m] = D[t-1][opt] + C[opt][m];
+    f(t, s, m-1, l, opt);
+    f(t, m+1, e, opt, r);
+}

2025fall/source/DP/LIS.cpp

@@ -0,0 +1,17 @@
+template<class I> vi lis(const vector<I>& S) {
+	if (S.empty()) return {};
+	vi prev(sz(S));
+	typedef pair<I, int> p;
+	vector<p> res;
+	rep(i,0,sz(S)) {
+		// change 0 -> i for longest non-decreasing subsequence
+		auto it = lower_bound(all(res), p{S[i], 0});
+		if (it == res.end()) res.emplace_back(), it = res.end()-1;
+		*it = {S[i], i};
+		prev[i] = it == res.begin() ? 0 : (it-1)->second;
+	}
+	int L = sz(res), cur = res.back().second;
+	vi ans(L);
+	while (L--) ans[L] = cur, cur = prev[cur];
+	return ans;
+}

2025fall/source/DP/LineContainer.cpp

@@ -0,0 +1,30 @@
+struct Line {
+	mutable ll k, m, p;
+	bool operator<(const Line& o) const { return k < o.k; }
+	bool operator<(ll x) const { return p < x; }
+};
+
+struct LineContainer : multiset<Line, less<>> {
+	// (for doubles, use inf = 1/.0, div(a,b) = a/b)
+	static const ll inf = LLONG_MAX;
+	ll div(ll a, ll b) { // floored division
+		return a / b - ((a ^ b) < 0 && a % b); }
+	bool isect(iterator x, iterator y) {
+		if (y == end()) return x->p = inf, 0;
+		if (x->k == y->k) x->p = x->m > y->m ? inf : -inf;
+		else x->p = div(y->m - x->m, x->k - y->k);
+		return x->p >= y->p;
+	}
+	void add(ll k, ll m) {
+		auto z = insert({k, m, 0}), y = z++, x = y;
+		while (isect(y, z)) z = erase(z);
+		if (x != begin() && isect(--x, y)) isect(x, y = erase(y));
+		while ((y = x) != begin() && (--x)->p >= y->p)
+			isect(x, erase(y));
+	}
+	ll query(ll x) {
+		assert(!empty());
+		auto l = *lower_bound(x);
+		return l.k * x + l.m;
+	}
+};

2025fall/source/DP/LineContainerGMS.cpp

@@ -0,0 +1,38 @@
+namespace LC
+{
+
+vll line;
+int getline(ll c)
+{
+    int k = 0, st = 20;
+    while(st+1)
+    {
+        int now = k+(1<<st); st--;
+        if(now >= line.size()) continue;
+        
+        if(line[now].fi*c+line[now].se < line[now-1].fi*c+line[now-1].se) k = now;
+    }
+    return k;
+}
+void pushline(pll C)
+{
+    while(line.size() >= 2)
+    {
+        pll A = line[line.size()-2];
+        pll B = line.back();
+        
+        A = {A.fi-C.fi, A.se-C.se};
+        B = {B.fi-C.fi, B.se-C.se};
+        A.se = -A.se; B.se = -B.se;
+        
+        if(A.fi<0) A = {-A.fi, -A.se};
+        if(B.fi<0) B = {-B.fi, -B.se};
+        
+        
+        if(A.se*B.fi >= B.se*A.fi) line.pop_back();
+        else break;
+    }
+    line.pb(C);
+}
+
+} // namespace LC

2025fall/source/DP/SlopeTrick.cpp

@@ -0,0 +1,52 @@
+const int N = 1e6+7;
+int arr[N];
+priority_queue<int> pq;
+ll ans = 0;
+int main()
+{
+    getint(n);
+    forr(i, n) scanf("%d", arr+i);
+    
+    pq.push(arr[1]); int t=0; ll val = 0;
+    fors(i, 2, n)
+    {
+        t++;
+        int r = t + pq.top();
+        if(r <= arr[i]) pq.push(arr[i]-t);
+        else
+        {
+            pq.push(arr[i]-t); pq.push(arr[i]-t); pq.pop();
+            ans += r-arr[i];
+        }
+    }
+    
+    printf("%lld", ans);
+}
+
+
+int arr[N];
+priority_queue<int> pq;
+int ans2[N];
+int main()
+{
+    getint(n);
+    forr(i, n) scanf("%d", arr+i);
+    
+    pq.push(arr[1]); ll ans = 0;
+    ans2[1] = arr[1];
+    fors(i, 2, n)
+    {
+        int r = (i-1) + pq.top();
+        if(r <= arr[i]) pq.push(arr[i]-(i-1));
+        else
+        {
+            pq.push(arr[i]-(i-1)); pq.push(arr[i]-(i-1)); pq.pop();
+            ans += r-arr[i];
+        }
+        
+        ans2[i] = pq.top() + (i-1);
+    }
+    
+    fore(i, n-1, 1) ans2[i] = min(ans2[i], ans2[i+1]-1);
+    forr(i, n) printf("%d\n", ans2[i]);
+}

2025fall/source/DP/SoS.cpp

@@ -0,0 +1,22 @@
+int n = 20;
+vector<int> a(1 << n);
+
+// keeps track of the sum over subsets
+// with a certain amount of matching bits in the prefix
+vector<vector<int>> dp(1 << n, vector<int>(n));
+
+vector<int> sos(1 << n);
+for (int mask = 0; mask < (1 << n); mask++) {
+	dp[mask][-1] = a[mask];
+	for (int x = 0; x < n; x++) {
+		dp[mask][x] = dp[mask][x - 1];
+		if (mask & (1 << x)) { dp[mask][x] += dp[mask - (1 << x)][x - 1]; }
+	}
+	sos[mask] = dp[mask][n - 1];
+}
+
+////////////////////////////////////////////
+D[i]에 미리 i에 해당하는 값을 넣어둔다
+fors(d, 0, 19) fors(i,0,(1<<20)-1)
+    if(i & (1<<d)) D[i] += D[i^(1<<d)];
+-> D[i] : sum of subset of mask i