oj.uz

Submission #1054816

# Submission time Handle Problem Language Result Execution time Memory
1054816 2024-08-12T12:22:44 Z nightfal Stations (IOI20_stations) C++14
29 / 100
 546 ms 940 KB 
// #include "stations.h"
#include <cstdio>
#include <iostream>
#include <cassert>
#include <map>
#include <vector>
#include <algorithm>
#include <cmath>
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;};

// bool subtask1(int k, vector<vector<int>> &g) {
//     int n = g.size();
//     for(auto elem: g)
//         if (elem.size() > 2) return false;
//     if (k==1'000) return true;
// 	else return false;
// }
// bool subtask2(int k, vector<int> &u, vector<int> &v) {
//     int m = u.size();
//     for(int i=0; i<m; i++)
//         if (!(u[i]==i+1 && v[i]==i/2 || u[i]==i/2 && v[i]==i+1))
//             return false;
//     if (k==1'000) return true;
// 	else return false;
// }
// bool subtask3(int k, vector<vector<int>> &g) {
//     int n=g.size(), cnt=0;
//     for(auto elem: g)
//         if(elem.size()>2) cnt++;
//     if (cnt==1 && k==1'000'000) return true;
//     return false;
// }
// bool subtask4(int n, int k) {
// 	if (n<=8 && k==1'000'000'000) return true;
// 	else return false;
// }

int DecideLabelsSubtask(int n, int k, vector<vector<int>> &g, vector<int> &u, vector<int> &v) {
	if (k==pow(10,9)) return n<=8?  4:5;
	else if (k>pow(10,3)) return 3;
	for(auto elem: g) 
		if(elem.size()>2) return 2;
	return 1;
}
void labelsSubtask1(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;

	for (int i=0; i<n; i++) {
		labels[node] = i;
		for(int child: g[node])
			if(labels[child]== -1) {node = child;}
	}
	return;
}
void labelsSubtask2(int n, vector<int> &labels) {
	for(int i=0; i<n; i++)
		labels[i] = i;
	return;
}
void genLabels3(int key, int node, vector<vector<int>> &g, vector<int> &labels) {
    labels[node]=key*1000+1;
    for(int i=2; i<1000; i++) {
        bool terminal = true;
        for(int child: g[node]) {
            if(labels[child]==-1) {labels[child] = 1000*key+i; node = child; terminal=false;}
        }
        if (terminal) return;
    }
}
void labelsSubtask3(int n, vector<vector<int>> &g, vector<int> &labels) {
	int root = 0;
	for(int i=0; i<n; i++)
		if(g[i].size() > 2)  {root = i; break;}
	labels[root] = 1000;
	for(int i=0; i<g[root].size(); i++) {
		int child = g[root][i];
		genLabels3(i+1, child, g, labels);
	} 
	return;
}
void genLabels4(int base, int key, int exp, int node, vector<vector<int>> &g, vector<int> &labels) {
    labels[node]=base + key*pow(10,exp);
	base = labels[node];

    for(int i=0; i<g[node].size(); i++) {
		int child = g[node][i];
		if (labels[child]==-1) 
        	genLabels4(base,i+1,exp-1, child, g, labels);
    }
	return;
}
void labelsSubtask4(int n, vector<vector<int>> &g, vector<int> &labels) {
	labels[0] = pow(10,8);
	int base = labels[0];
	for(int i=0; i<g[0].size(); i++) {
		int child = g[0][i];
		if (labels[child]==-1) 
			genLabels4(base,i+1,7, child, g, labels);
	}	
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	std::vector<int> labels(n,-1);
    vector<vector<int>> g(n);
    for (int i=0; i<n-1; i++) {
        g[u[i]].push_back(v[i]);
        g[v[i]].push_back(u[i]);
    }
	// print(g);
	int subtask = DecideLabelsSubtask(n,k,g,u,v);
	// cout << "subtask:" << subtask << endl;
	switch(subtask) {
		case 1: labelsSubtask1(n, g, labels); break;
    	case 2: labelsSubtask2(n,labels); break;
		case 3: labelsSubtask3(n,g,labels); break;
		case 4: labelsSubtask4(n,g,labels);
	}
    // print(labels);
	return labels;
}
bool ancestor(int s, int t) {
    if (s==0) return true;
    while (t) {
        if (s==t) return true;
        t = (t-1)>>1;
    }
    return false;
}
int decideFindSubtask(int s, int t, vector<int> &c) {
	if (s>pow(10,8) || t>pow(10,8)) return 4;
    else if (s>1'000 || t>1'000) return 3;
	switch(s) {
		case 0:
			if (c.size()==1) return 1;
			else if (c.size()==2) return 2;
		case 1:
			if (t==0) return -1;
			else {
				for(int elem: c) 
					if(elem > 2) return 2;
				return 1;
			}
		default:
			for(int i=0; i<c.size(); i++)
				if(!(c[i]==s-1 || c[i]==s+1)) return 2;
			return 1;
	}
}
int find_next_station(int s, int t, std::vector<int> c) {
    int subtask = decideFindSubtask(s,t,c);

	switch(subtask) {
		case -1: return 0;
		case 1: 
	        for(int child: c)
    	        if (s<t && s<child) return child;
        	    else if (s>t && s>child) return child;
		case 2:
	        if (ancestor(2*s+1,t)) return 2*s+1;
    	    else if (ancestor(2*s+2,t)) return 2*s+2;
        	else return (s-1)/2;
		case 3:
			if (s==1000) return (t/1000)*1000+1;
			else if (s/1000 == t/1000) {
				if (s<t) return s+1;
				else return s-1;
			}
			else { 
				if (s%1000==1) return 1000;
				else return s-1;
			}
		case 4: return 0;
	}
}

Compilation message

stations.cpp: In function 'void labelsSubtask3(int, std::vector<std::vector<int> >&, std::vector<int>&)':
stations.cpp:81:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |  for(int i=0; i<g[root].size(); i++) {
      |               ~^~~~~~~~~~~~~~~
stations.cpp: In function 'void genLabels4(int, int, int, int, std::vector<std::vector<int> >&, std::vector<int>&)':
stations.cpp:91:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |     for(int i=0; i<g[node].size(); i++) {
      |                  ~^~~~~~~~~~~~~~~
stations.cpp: In function 'void labelsSubtask4(int, std::vector<std::vector<int> >&, std::vector<int>&)':
stations.cpp:101:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |  for(int i=0; i<g[0].size(); i++) {
      |               ~^~~~~~~~~~~~
stations.cpp: In function 'int decideFindSubtask(int, int, std::vector<int>&)':
stations.cpp:149:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  149 |    for(int i=0; i<c.size(); i++)
      |                 ~^~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:179:1: warning: control reaches end of non-void function [-Wreturn-type]
  179 | }
      | ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 298 ms 684 KB Output is correct
2 Correct 229 ms 684 KB Output is correct
3 Correct 485 ms 684 KB Output is correct
4 Correct 316 ms 684 KB Output is correct
5 Correct 337 ms 684 KB Output is correct
6 Correct 245 ms 684 KB Output is correct
7 Correct 232 ms 684 KB Output is correct
8 Correct 1 ms 800 KB Output is correct
9 Correct 1 ms 776 KB Output is correct
10 Correct 0 ms 768 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 245 ms 684 KB Output is correct
2 Correct 279 ms 684 KB Output is correct
3 Correct 511 ms 684 KB Output is correct
4 Correct 393 ms 684 KB Output is correct
5 Correct 353 ms 684 KB Output is correct
6 Correct 243 ms 736 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 313 ms 684 KB Output is correct
2 Correct 304 ms 684 KB Output is correct
3 Correct 546 ms 696 KB Output is correct
4 Correct 378 ms 684 KB Output is correct
5 Correct 354 ms 684 KB Output is correct
6 Correct 248 ms 684 KB Output is correct
7 Correct 262 ms 684 KB Output is correct
8 Correct 0 ms 768 KB Output is correct
9 Correct 2 ms 768 KB Output is correct
10 Correct 0 ms 764 KB Output is correct
11 Correct 324 ms 684 KB Output is correct
12 Correct 275 ms 932 KB Output is correct
13 Correct 281 ms 932 KB Output is correct
14 Correct 274 ms 684 KB Output is correct
15 Correct 25 ms 768 KB Output is correct
16 Correct 30 ms 772 KB Output is correct
17 Correct 59 ms 768 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 531 ms 940 KB Wrong query response.
2 Halted 0 ms 0 KB -

Subtask #5
0 / 61.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Invalid labels (values out of range). scenario=1, k=1000000000, vertex=0, label=-1
2 Halted 0 ms 0 KB -