Submission #33543

#	Time	Username	Problem	Language	Result	Execution time	Memory
33543		mohammad_kilani	Toy Train (IOI17_train)	C++14	0 / 100	2000 ms	3120 KiB

train

#include <bits/stdc++.h>
#include "train.h"
using namespace std;
const int N = 5010;
int n ;
bitset< N > dp , vis , win ;
vector<int> g[N] , a , r;
bool solve(int i, int j){
	if(r[i]) return 1;
	if(i == j && !a[i]) return 1;
	if(vis[i]) return dp[i];
	vis[i] = 1;
	dp[i] = 1;
	if(!a[i]){
		for(int k=0;k<g[i].size();k++){
			int node = g[i][k];
			if(solve(node,j) == 0) dp[i] = 0;
		}
	}
	else{
		bool can = false;
		for(int k=0;k<g[i].size();k++){
			int node = g[i][k];
			if(node != j && solve(node,j) == 1) can = true;
		}
		dp[i] = can;
	}
	return dp[i];
}

bool solve2(int i){
	if(win[i] == 0) return 0;
	if(vis[i]) return dp[i];
	vis[i] = 1;
	dp[i] = 1;
	if(!a[i]){
		for(int k=0;k<g[i].size();k++){
			int node = g[i][k];
			if(solve2(node) == 0) dp[i] = 0;
		}
	}
	else{
		bool can = false;
		for(int k=0;k<g[i].size();k++){
			int node = g[i][k];
			if(solve2(node) == 1) can = true;
		}
		dp[i] = can;
	}
	return dp[i];
}


std::vector<int> who_wins(std::vector<int> A, std::vector<int> R, std::vector<int> u, std::vector<int> v) {
	vector<int> ans;
	a = A;
	r = R;;
	n = a.size();
	for(int i=0;i<u.size();i++) g[u[i]].push_back(v[i]);
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++) vis[j] = 0 ;
		bool can = 1;
		for(int j=0;j<g[i].size();j++){
			if(solve(g[i][j],i) == 0) can = 0;
		}
		win[i] = can;
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++) vis[j] = 0 ;
		bool can = 1;
		if(solve2(i) == 0) can = 0;
		win[i] = can;
		ans.push_back(win[i]);
	}
	return ans;
}

Compilation message (stderr)

train.cpp: In function 'bool solve(int, int)':
train.cpp:15:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
                ^
train.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
                ^
train.cpp: In function 'bool solve2(int)':
train.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
                ^
train.cpp:44:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
                ^
train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:59:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<u.size();i++) g[u[i]].push_back(v[i]);
               ^
train.cpp:63:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<g[i].size();j++){
                ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 11
• Subtask 4: 0 / 11
• Subtask 5: 0 / 12
• Subtask 6: 0 / 51