oj.uz

Submission #1062288

# Submission time Handle Problem Language Result Execution time Memory
1062288 2024-08-17T01:38:03 Z nightfal Stations (IOI20_stations) C++17
5 / 100
 628 ms 776 KB 
#include <vector>
#include <iostream>
using namespace std;

template <typename T> void print(T elem) {cout << elem << " ";}
template <typename T> void print(vector<T> &v) {for(auto elem: v) print(elem); cout << endl;}
template <typename T> void print(vector<vector<T>> &v) {for(auto elem: v) print(elem); cout << endl;}

void makeG(vector<vector<int>> &g, vector<int> &u, vector<int> &v) {
	for(int i=0; i<u.size(); i++) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
}
int decideSubtaskLabel(int n, int k, vector<vector<int>> &g, vector<int> &u, vector<int> &v) {
	int subtask = 0, cnt = 0;
	bool subtask2 = true;
	for(int i=0; i<n; i++) {
		if (g[i].size()>2) cnt++;
		if (!(u[i]==i+1 && v[i]==i/2 || u[i]==i/2 && v[i]==i+1)) subtask2= false;
	}
	if (cnt==0) return 1;
	if (subtask2) return 2;
	if (cnt==1) return 3;
}
void subtask1Label(int n, vector<vector<int>> &g, vector<int> &labels) {
	int node = 0;
	for(int i=0; i<n; i++)
		if(g[i].size()==1) node=i;

	int cnt = 0;
	while(labels[node]==-1) {
		labels[node] = cnt++; 
		for(int elem: g[node])
			if(labels[elem]==-1) node = elem;
	}
	return;
}
void subtask2Label(int n, vector<int> &labels) {
	for(int i=0; i<n; i++)
		labels[i] = i+1;
	return;
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	vector<vector<int>> g(n);
	makeG(g,u,v);
	// print(g);
	int subtask = decideSubtaskLabel(n,k,g,u,v);
	vector<int> labels(n,-1);
	switch(subtask) {
		case 1: subtask1Label(n,g,labels); return labels;
		case 2: subtask2Label(n,labels); return labels;
		// case 2: 
		// case 3:
	}
}
int decideSubtaskFind(int s, int t, vector<int> &c) {

	for(int i=0; i<c.size(); i++)
		if (c[i] < s-1 || c[i] > s+1) return 2;
	return 1;
}
int subtask1Find(int s, int t, vector<int> &c) {
	if (c.size()==1) return c[0];
	else return t<s? c[0]:c[1];
}
bool ancestor(int a, int b) {
	if (a==0) return true;
	while(b!=0) { if(a==b) return true; else b >>= 1; }
	return false;
}
int subtask2Find(int s, int t, vector<int> &c) {
	for(int i=c.size()-1; i>=0; i--)
		if(ancestor(c[i],t)) return c[i];
	return c[0];
}
int find_next_station(int s, int t, std::vector<int> c) {
	int subtask = decideSubtaskFind(s,t,c);
	switch(subtask) {
		case 1: return subtask1Find(s,t,c);
		case 2: return subtask2Find(s,t,c);
	}
	return c[0];
}

Compilation message

stations.cpp: In function 'void makeG(std::vector<std::vector<int> >&, std::vector<int>&, std::vector<int>&)':
stations.cpp:10:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for(int i=0; i<u.size(); i++) {
      |               ~^~~~~~~~~
stations.cpp: In function 'int decideSubtaskLabel(int, int, std::vector<std::vector<int> >&, std::vector<int>&, std::vector<int>&)':
stations.cpp:20:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   20 |   if (!(u[i]==i+1 && v[i]==i/2 || u[i]==i/2 && v[i]==i+1)) subtask2= false;
stations.cpp:16:6: warning: unused variable 'subtask' [-Wunused-variable]
   16 |  int subtask = 0, cnt = 0;
      |      ^~~~~~~
stations.cpp: In function 'int decideSubtaskFind(int, int, std::vector<int>&)':
stations.cpp:59:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |  for(int i=0; i<c.size(); i++)
      |               ~^~~~~~~~~
stations.cpp: In function 'int decideSubtaskLabel(int, int, std::vector<std::vector<int> >&, std::vector<int>&, std::vector<int>&)':
stations.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type]
   25 | }
      | ^
stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:45:25: warning: control reaches end of non-void function [-Wreturn-type]
   45 |  vector<vector<int>> g(n);
      |                         ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 368 ms 684 KB Output is correct
2 Correct 328 ms 684 KB Output is correct
3 Correct 608 ms 684 KB Output is correct
4 Correct 487 ms 684 KB Output is correct
5 Correct 404 ms 684 KB Output is correct
6 Correct 268 ms 684 KB Output is correct
7 Correct 346 ms 684 KB Output is correct
8 Correct 2 ms 764 KB Output is correct
9 Correct 1 ms 776 KB Output is correct
10 Correct 0 ms 768 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 600 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 294 ms 684 KB Output is correct
2 Correct 338 ms 684 KB Output is correct
3 Correct 625 ms 684 KB Output is correct
4 Correct 512 ms 684 KB Output is correct
5 Correct 393 ms 684 KB Output is correct
6 Correct 321 ms 684 KB Output is correct
7 Correct 298 ms 684 KB Output is correct
8 Correct 1 ms 776 KB Output is correct
9 Correct 3 ms 768 KB Output is correct
10 Correct 1 ms 764 KB Output is correct
11 Runtime error 1 ms 344 KB Execution killed with signal 11
12 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 628 ms 768 KB Output is correct
2 Correct 454 ms 684 KB Output is correct
3 Correct 408 ms 684 KB Output is correct
4 Correct 2 ms 768 KB Output is correct
5 Correct 1 ms 776 KB Output is correct
6 Correct 0 ms 776 KB Output is correct
7 Runtime error 1 ms 344 KB Execution killed with signal 11
8 Halted 0 ms 0 KB -

Subtask #5
0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 359 ms 684 KB Output is correct
2 Correct 287 ms 684 KB Output is correct
3 Correct 505 ms 684 KB Output is correct
4 Correct 492 ms 684 KB Output is correct
5 Correct 404 ms 684 KB Output is correct
6 Correct 314 ms 684 KB Output is correct
7 Correct 304 ms 684 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 764 KB Output is correct
10 Correct 0 ms 768 KB Output is correct
11 Runtime error 1 ms 600 KB Execution killed with signal 11
12 Halted 0 ms 0 KB -