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답안 #227325

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
227325 2020-04-27T00:53:25 Z wilwxk 3단 점프 (JOI19_jumps) C++14
100 / 100
 1449 ms 64960 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

struct st_node {
	ll mxv, mx;
	ll lz;
};

const int MAXN = 5e5+5;
const ll INF = 1e18;
int input[MAXN];
vector<tuple<int, int, int> > qv; //{r, l, id}
vector<tuple<int, int, int> > jumps; //{r, l, val}
st_node seg[MAXN*4];
ll ans[MAXN];
int n, q;

void st_process() {
	stack<int> st;
	input[0] = 2e9;
	st.push(0);
	for(int i = 1; i <= n; i++) {
		while(input[st.top()] < input[i]) st.pop();
		if(st.top() != 0) {
			int id = st.top();
			jumps.push_back({ i+i-id, id, input[i]+input[id] });
		}
		st.push(i);
	}
	while(st.size()) st.pop();
	input[n+1] = 2e9;
	st.push(n+1);
	for(int i = n; i >= 1; i--) {
		while(input[st.top()] < input[i]) st.pop();
		if(st.top() != n+1) {
			int id = st.top();
			jumps.push_back({ id+id-i, i, input[i]+input[id] });
		}
		st.push(i);
	}
	sort(jumps.begin(), jumps.end());
}

void refresh(int u, int l, int r) {
	ll val = seg[u].lz;
	seg[u].lz = 0;
	seg[u].mx = max(seg[u].mx, seg[u].mxv+val);
	if(l == r) return;
	int vl = u*2;
	int vr = vl|1;
	seg[vl].lz = max(seg[vl].lz, val);
	seg[vr].lz = max(seg[vr].lz, val);
}

ll query(int u, int l, int r, int ql, int qr) {
	refresh(u, l, r);
	if(ql > r || qr < l) return -INF;
	if(ql <= l && qr >= r) return seg[u].mx;
	int m = (l+r)/2;
	int vl = u*2;
	int vr = vl|1;
	return max( query(vl, l, m, ql, qr), query(vr, m+1, r, ql, qr) );
}

void update(int u, int l, int r, int ql, int qr, ll val) {
	refresh(u, l, r);
	if(ql > r || qr < l) return;
	if(ql <= l && qr >= r) {
		seg[u].lz = val;
		refresh(u, l, r);
		return;
	}
	int m = (l+r)/2;
	int vl = u*2;
	int vr = vl|1;
	update(vl, l, m, ql, qr, val);
	update(vr, m+1, r, ql, qr, val);
	seg[u].mx = max(seg[vl].mx, seg[vr].mx); 
	seg[u].mxv = max(seg[vl].mxv, seg[vr].mxv); 
}

void build(int u, int l, int r) {
	seg[u].mx = seg[u].mxv = -INF;
	if(l == r) return;
	int m = (l+r)/2;
	int vl = u*2;
	int vr = vl|1;
	build(vl, l, m);
	build(vr, m+1, r);
}

void activate(int u, int l, int r, int qi, ll val) {
	refresh(u, l, r);
	if(qi < l || qi > r) return;
	if(l == r) {
		seg[u].mxv = max(seg[u].mxv, val);
		seg[u].mx = max(seg[u].mx, val);
		return;
	}
	int m = (l+r)/2;
	int vl = u*2;
	int vr = vl|1;
	activate(vl, l, m, qi, val);
	activate(vr, m+1, r, qi, val);
	seg[u].mx = max(seg[vl].mx, seg[vr].mx); 
	seg[u].mxv = max(seg[vl].mxv, seg[vr].mxv); 
}

int main() {
	scanf("%d", &n);
	for(int i = 1; i <= n; i++) scanf("%d", &input[i]);
	scanf("%d", &q);
	for(int i = 1; i <= q; i++) {
		int a, b;
		scanf("%d %d", &a, &b);
		qv.push_back({b, a, i});
	}
	sort(qv.begin(), qv.end());

	st_process();
	// for(auto jump : jumps) printf("%d %d %d\n", get<0>(jump), get<1>(jump), get<2>(jump));

	build(1, 1, n);

	int pj = 0, pq = 0;
	for(int i = 1; i <= n; i++) {
		while(pj < jumps.size() && get<0>(jumps[pj]) <= i) {
			int l, r, val;
			tie(r, l, val) = jumps[pj];
			// printf("activate %d %d\n", l, val);
			activate(1, 1, n, l, val);
			pj++;
		}
		update(1, 1, n, 1, n, input[i]);
		// printf("upd %d\n", input[i]);
		// printf("ans %d...\n", i);
		while(pq < qv.size() && get<0>(qv[pq]) <= i) {
			int l, r, id;
			tie(r, l, id) = qv[pq];
			ans[id] = query(1, 1, n, l, r);
			pq++;
		}
	}

	for(int i = 1; i <= q; i++) printf("%lld\n", ans[i]);
}

Compilation message

jumps.cpp: In function 'int main()':
jumps.cpp:128:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(pj < jumps.size() && get<0>(jumps[pj]) <= i) {
         ~~~^~~~~~~~~~~~~~
jumps.cpp:138:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(pq < qv.size() && get<0>(qv[pq]) <= i) {
         ~~~^~~~~~~~~~~
jumps.cpp:111:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
jumps.cpp:112:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1; i <= n; i++) scanf("%d", &input[i]);
                              ~~~~~^~~~~~~~~~~~~~~~~
jumps.cpp:113:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &q);
  ~~~~~^~~~~~~~~~
jumps.cpp:116:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &a, &b);
   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 9 ms 384 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 9 ms 384 KB Output is correct
11 Correct 454 ms 20620 KB Output is correct
12 Correct 460 ms 20500 KB Output is correct
13 Correct 431 ms 20312 KB Output is correct
14 Correct 458 ms 20700 KB Output is correct
15 Correct 442 ms 20696 KB Output is correct
16 Correct 459 ms 19952 KB Output is correct
17 Correct 435 ms 19928 KB Output is correct
18 Correct 452 ms 19932 KB Output is correct
19 Correct 478 ms 20508 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 259 ms 20056 KB Output is correct
2 Correct 144 ms 18316 KB Output is correct
3 Correct 150 ms 18312 KB Output is correct
4 Correct 263 ms 20060 KB Output is correct
5 Correct 257 ms 20280 KB Output is correct
6 Correct 246 ms 19284 KB Output is correct
7 Correct 252 ms 19288 KB Output is correct
8 Correct 256 ms 19288 KB Output is correct
9 Correct 253 ms 19544 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 9 ms 384 KB Output is correct
11 Correct 454 ms 20620 KB Output is correct
12 Correct 460 ms 20500 KB Output is correct
13 Correct 431 ms 20312 KB Output is correct
14 Correct 458 ms 20700 KB Output is correct
15 Correct 442 ms 20696 KB Output is correct
16 Correct 459 ms 19952 KB Output is correct
17 Correct 435 ms 19928 KB Output is correct
18 Correct 452 ms 19932 KB Output is correct
19 Correct 478 ms 20508 KB Output is correct
20 Correct 259 ms 20056 KB Output is correct
21 Correct 144 ms 18316 KB Output is correct
22 Correct 150 ms 18312 KB Output is correct
23 Correct 263 ms 20060 KB Output is correct
24 Correct 257 ms 20280 KB Output is correct
25 Correct 246 ms 19284 KB Output is correct
26 Correct 252 ms 19288 KB Output is correct
27 Correct 256 ms 19288 KB Output is correct
28 Correct 253 ms 19544 KB Output is correct
29 Correct 1417 ms 64736 KB Output is correct
30 Correct 1069 ms 58700 KB Output is correct
31 Correct 1228 ms 58876 KB Output is correct
32 Correct 1371 ms 64576 KB Output is correct
33 Correct 1419 ms 64704 KB Output is correct
34 Correct 1449 ms 62636 KB Output is correct
35 Correct 1403 ms 62144 KB Output is correct
36 Correct 1399 ms 62020 KB Output is correct
37 Correct 1427 ms 63556 KB Output is correct
38 Correct 1154 ms 64736 KB Output is correct
39 Correct 1171 ms 64576 KB Output is correct
40 Correct 1133 ms 61504 KB Output is correct
41 Correct 1153 ms 60864 KB Output is correct
42 Correct 1126 ms 60864 KB Output is correct
43 Correct 1093 ms 62672 KB Output is correct
44 Correct 1207 ms 64668 KB Output is correct
45 Correct 1222 ms 64868 KB Output is correct
46 Correct 1175 ms 61504 KB Output is correct
47 Correct 1175 ms 61120 KB Output is correct
48 Correct 1166 ms 61248 KB Output is correct
49 Correct 1182 ms 63108 KB Output is correct
50 Correct 1226 ms 64840 KB Output is correct
51 Correct 1219 ms 64960 KB Output is correct
52 Correct 1219 ms 62276 KB Output is correct
53 Correct 1234 ms 62144 KB Output is correct
54 Correct 1189 ms 61888 KB Output is correct
55 Correct 1226 ms 63680 KB Output is correct