Submission #427540

#	Time	Username	Problem	Language	Result	Execution time	Memory
427540		markthitrin	Toy Train (IOI17_train)	C++14	0 / 100	194 ms	262148 KiB

train

#include "train.h"
#include <vector>
#include <iostream>
int N,M;
std::vector<int> f[5005];
std::vector<int> inv_f[5005];
std::vector<int> ans;
int degree[5005];
int m[5005];
bool come[5005];
bool reachable[5005];
void inv_bfs(std::vector<int>& a,int pos){
    if(come[pos])
        return;
    come[pos] = true;
    for(int q = 0;q<inv_f[pos].size();q++){
        m[inv_f[pos][q]]++;
        if(a[inv_f[pos][q]] == 0 && degree[inv_f[pos][q]] == m[inv_f[pos][q]]){
            inv_bfs(a,inv_f[pos][q]);
        }
        else
            inv_bfs(a,inv_f[pos][q]);
    }
}
void bfs(std::vector<int>& a,int pos){
    if(come[pos])
        reachable[pos] = true;
    else return;
    for(int q = 0 ;q<f[pos].size();q++){
        bfs(a,f[pos][q]);
    }
}
void last_func(std::vector<int> a,int pos){
    if(a[pos] == 0 && m[pos] !=degree[pos] && !reachable[pos])
        return;
    if(ans[pos] == 1)
        return;
    ans[pos] = 1;
    for(int q = 0 ;q<inv_f[q].size();q++){
        m[inv_f[pos][q]]++;
        last_func(a,inv_f[pos][q]);
    }
}
std::vector<int> who_wins(std::vector<int> a, std::vector<int> r, std::vector<int> u, std::vector<int> v) {
	N = a.size();
	M = u.size();
	for(int q = 0 ;q<M;q++){
        f[u[q]].push_back(v[q]);
        inv_f[v[q]].push_back(u[q]);
        degree[u[q]]++;
	}
	for(int q = 0;q<N;q++){
        if(r[q]){
            for(int w = 0 ;w<N;w++){
                m[w] = 0;
                come[w] = false;
            }
            inv_bfs(a,q);
            bfs(a,q);
        }
	}
    for(int w = 0;w<N;w++){
        m[w] = 0;
    }
	for(int q = 0;q<N;q++){
        ans.push_back(0);
	}
	for(int q= 0;q<N;q++){
        if(reachable[q])
            last_func(a,q);
	}
	return ans;
}
/*
2 4
0 1
1 0
0 0
0 1
1 0
1 1
1 1
*/

Compilation message (stderr)

train.cpp: In function 'void inv_bfs(std::vector<int>&, int)':
train.cpp:16:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int q = 0;q<inv_f[pos].size();q++){
      |                   ~^~~~~~~~~~~~~~~~~~
train.cpp: In function 'void bfs(std::vector<int>&, int)':
train.cpp:29:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(int q = 0 ;q<f[pos].size();q++){
      |                    ~^~~~~~~~~~~~~~
train.cpp: In function 'void last_func(std::vector<int>, int)':
train.cpp:39:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for(int q = 0 ;q<inv_f[q].size();q++){
      |                    ~^~~~~~~~~~~~~~~~

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