oj.uz

Submission #335279

# Submission time Handle Problem Language Result Execution time Memory
335279 2020-12-11T19:30:41 Z Plurm Railway Trip (JOI17_railway_trip) C++11
20 / 100
 2000 ms 12524 KB 
#include <bits/stdc++.h>
using namespace std;
vector<int> g[100005]; // cartesian-tree-like graph
int d[100005];
vector<int> bckt[100005];
int l[100005];
int n,k,q;
void compute(int a){
	d[a] = 0;
	for(int i = 1; i <= k; i++){
		for(int x : bckt[i]){
			for(int y : g[x]) d[x] = min(d[x], d[y]+1);
		}
		reverse(bckt[i].begin(), bckt[i].end());
		for(int x : bckt[i]){
			for(int y : g[x]) d[x] = min(d[x], d[y]+1);
		}
		reverse(bckt[i].begin(), bckt[i].end());
	}
}
int main(){
	scanf("%d%d%d",&n,&k,&q);
	stack<int> stk;
	for(int i = 1; i <= n; i++){
		scanf("%d", l+i);
		bckt[l[i]].push_back(i);
		while(!stk.empty() && l[stk.top()] <= l[i]){
			g[i].push_back(stk.top());
			stk.pop();
		}
		if(!stk.empty() && l[stk.top()] == l[i]) g[i].push_back(stk.top());
		stk.push(i);
	}
	while(!stk.empty()) stk.pop();
	for(int i = n; i > 0; i--){
		while(!stk.empty() && l[stk.top()] <= l[i]){
			g[i].push_back(stk.top());
			stk.pop();
		}
		if(!stk.empty() && l[stk.top()] == l[i]) g[i].push_back(stk.top());
		stk.push(i);
	}
	while(q--){
		int a,b;
		scanf("%d%d",&a,&b);
		for(int i = 1; i <= n; i++) d[i] = 1e9;
		compute(a);
		vector<int> v(n+1);
		for(int i = 1; i <= n; i++) v[i] = d[i];
		for(int i = 1; i <= n; i++) d[i] = 1e9;
		compute(b);
		int ans = 1e9;
		for(int i = 1; i <= n; i++){
			ans = min(ans, v[i] + d[i]);
		}
		printf("%d\n", ans-1);
	}
	return 0;
}

Compilation message

railway_trip.cpp: In function 'int main()':
railway_trip.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   22 |  scanf("%d%d%d",&n,&k,&q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~
railway_trip.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |   scanf("%d", l+i);
      |   ~~~~~^~~~~~~~~~~
railway_trip.cpp:45:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   45 |   scanf("%d%d",&a,&b);
      |   ~~~~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4972 KB Output is correct
2 Correct 5 ms 4972 KB Output is correct
3 Correct 4 ms 4972 KB Output is correct
4 Correct 4 ms 4972 KB Output is correct
5 Correct 4 ms 4972 KB Output is correct
6 Correct 4 ms 4972 KB Output is correct
7 Correct 9 ms 4972 KB Output is correct
8 Correct 7 ms 4972 KB Output is correct
9 Correct 4 ms 4972 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5100 KB Output is correct
2 Correct 381 ms 9196 KB Output is correct
3 Correct 452 ms 9196 KB Output is correct
4 Correct 474 ms 9068 KB Output is correct
5 Correct 533 ms 9132 KB Output is correct
6 Correct 559 ms 9068 KB Output is correct
7 Correct 1051 ms 10604 KB Output is correct
8 Correct 178 ms 9700 KB Output is correct
9 Correct 192 ms 10348 KB Output is correct
10 Correct 171 ms 10216 KB Output is correct
11 Correct 472 ms 10092 KB Output is correct
12 Correct 428 ms 9708 KB Output is correct
13 Correct 477 ms 9700 KB Output is correct
14 Correct 466 ms 9964 KB Output is correct
15 Correct 482 ms 9708 KB Output is correct
16 Correct 486 ms 9700 KB Output is correct
17 Correct 486 ms 9188 KB Output is correct
18 Correct 484 ms 9068 KB Output is correct
19 Correct 357 ms 12524 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2086 ms 9068 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 55.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2068 ms 10596 KB Time limit exceeded
2 Halted 0 ms 0 KB -