Submission #836161

#	Time	Username	Problem	Language	Result	Execution time	Memory
836161		kamelfanger83	Toy Train (IOI17_train)	C++14	11 / 100	9 ms	1436 KiB

train

#include <vector>
#include <iostream>
#include <queue>
#include <cassert>

#include "train.h"

using namespace std;

vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v){
    int n = a.size();
    vector<vector<int>> edg (n), revedg (n);
    vector<int> recharg;
    for (int i = 0; i < n; ++i) {
        if (r[i]) recharg.push_back(i);
    }
    for (int i = 0; i < u.size(); ++i) {
        edg[u[i]].push_back(v[i]);
        revedg[v[i]].push_back(u[i]);
    }
    queue<int> addWin;
    for (int i : recharg) addWin.push(i);
    vector<int> res (n);
    vector<int> outwin (n);
    while(!addWin.empty()){
        int i = addWin.front();
        addWin.pop();
        if (res[i]) continue;
        res[i] = true;
        for (int re : revedg[i]){
            outwin[re]++;
            if (a[re] && outwin[re] == 1) addWin.push(re);
            else if (!a[re] && outwin[re] == edg[re].size()) addWin.push(re);
        }
    }
    queue<int> rWin;
    for (int i : recharg){
        if (res[i]){
            if (a[i] && !outwin[i]) rWin.push(i);
            else if (!a[i] && outwin[i] < edg[i].size()) rWin.push(i);
        }
    }
    while (!rWin.empty()){
        int i = rWin.front();
        rWin.pop();
        if (!res[i]) continue;
        res[i] = false;
        for (int re : revedg[i]){
            outwin[re]--;
            assert(outwin[re] >= 0);
            if (!a[re]) rWin.push(re);
            else if (outwin[re] == 0) rWin.push(re);
        }
    }
    return res;
}
/*
int main(){
    auto ret = who_wins({1, 1}, {0, 1}, {1, 0}, {0, 0});
    for (int i : ret) cout << i << " ";
    return 0;
}*/

Compilation message (stderr)

train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:17:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for (int i = 0; i < u.size(); ++i) {
      |                     ~~^~~~~~~~~~
train.cpp:33:43: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |             else if (!a[re] && outwin[re] == edg[re].size()) addWin.push(re);
train.cpp:40:41: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |             else if (!a[i] && outwin[i] < edg[i].size()) rWin.push(i);

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