Submission #390143

#	Time	Username	Problem	Language	Result	Execution time	Memory
390143		mehrdad_sohrabi	Toy Train (IOI17_train)	C++14	100 / 100	504 ms	1988 KiB

train

#include <bits/stdc++.h>
#include "train.h"
/// 500 485 462 A4
using namespace std;
typedef long long int ll;
typedef complex<double> point;
typedef long double ld;
#define pb push_back
#define pii pair < ll , ll >
#define F first
#define S second
//#define endl '\n'
#define int long long
#define sync ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
#define kill(x) return cout<<x<<'\n', 0;
const int N=5e3+10,inf=(ll)1e15;
ll vis[N];
ll t[N];
vector <int> g[N],in[N];
ll mark[N];
std::vector<int32_t> who_wins(std::vector<int32_t> A, std::vector<int32_t> R, std::vector<int32_t> U, std::vector<int32_t> V) {
	ll n=A.size(),m=U.size();
    for (int i=0;i<n;i++){
        g[i].clear();
        in[i].clear();
        vis[i]=0;
    }
	for (int i=0;i<U.size();i++){
        g[U[i]].pb(V[i]);
        in[V[i]].pb(U[i]);
	}
	ll cnt=0;
	while(true){
        queue <int> q;
        for (int i=0;i<n;i++){
            t[i]=g[i].size();
            mark[i]=0;
            if (vis[i]==0 && R[i]==1){
                q.push(i);
                t[i]=0;
            }
        }
        while(q.size()){
            ll v=q.front();
            if (mark[v]) cout << 1/0 << endl;
            mark[v]=1;
            t[v]=0;
            q.pop();
            for (auto u : in[v]){
              //  cout << u << " " << v << " " << A[u] << " " << t[u] << endl;
                if (A[u]==1 && t[u]!=0){
                    t[u]=0;
                    q.push(u);
                }
                else if (t[u]!=0){
                    t[u]--;
                    if (t[u]==0) q.push(u);
                }
            }
        }
        ll p1=0;
        for (int i=0;i<n;i++){
            if (vis[i] || R[i]==0) continue;
            ll p2=0;
            ll p3=0;
            for (auto u : g[i]){
                if (t[u]==0) p2=1;
                else p3=1;
            }
            if (p2==0 || (A[i]==0 && p3==1)){
                p1=1;
                vis[i]=1;
            }
        }
        if (p1==0) break;
	}
	ll p1=0;
	for (int i=0;i<n;i++){
        if (vis[i]==0 && R[i]==1) p1=1;
	}
	vector <int32_t> ans;
	for (int i=0;i<n;i++){
        if (p1==0) ans.pb(0);
        else {
            if (t[i]==0) ans.pb(1);
            else ans.pb(0);
        }
	}
	return ans;
}
/*
int32_t main() {
	int n, m;
	assert(2 == scanf("%d %d", &n, &m));

	vector<int32_t> a(n), r(n), u(m), v(m);

	for(int i = 0; i < n; i++)
		assert(1 == scanf("%d", &a[i]));

	for(int i = 0; i < n; i++)
		assert(1 == scanf("%d", &r[i]));

	for(int i = 0; i < m; i++)
		assert(2 == scanf("%d %d", &u[i], &v[i]));

	vector<int32_t> res = who_wins(a, r, u, v);

	for(int i = 0; i < (int)res.size(); i++)
		printf(i ? " %d" : "%d", res[i]);
	printf("\n");

	return 0;
}
*/
/*
15 40
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 1 0 0 0 1 0 0 1 0
10 7
1 13
3 1
7 6
14 8
2 7
4 11
6 7
5 13
6 13
4 0
3 7
4 12
5 11
2 8
3 9
0 6
8 9
3 0
2 0
13 6
8 13
9 7
5 10
12 12
14 11
2 10
1 0
2 9
10 14
9 0
11 13
5 6
14 5
14 10
7 13
10 4
11 1
0 1
2 3
*/
/*
10 7
14 8
2 7
4 11
4 0
3 7
4 12
5 11
2 8
3 9
8 9
3 0
2 0
9 7
12 12
14 11
2 9
9 0
14 5
2 3
*/

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:29:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  for (int i=0;i<U.size();i++){
      |               ~^~~~~~~~~
train.cpp:46:35: warning: division by zero [-Wdiv-by-zero]
   46 |             if (mark[v]) cout << 1/0 << endl;
      |                                  ~^~
train.cpp:23:16: warning: unused variable 'm' [-Wunused-variable]
   23 |  ll n=A.size(),m=U.size();
      |                ^
train.cpp:33:5: warning: unused variable 'cnt' [-Wunused-variable]
   33 |  ll cnt=0;
      |     ^~~

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