Submission #574618

#	Time	Username	Problem	Language	Result	Execution time	Memory
574618		definitelynotmee	Toy Train (IOI17_train)	C++98	27 / 100	998 ms	262144 KiB

train

#include<bits/stdc++.h>
#include"train.h"
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template<typename T>
using matrix = vector<vector<T>>;

std::vector<int> who_wins(std::vector<int> a, std::vector<int> r, std::vector<int> u, std::vector<int> v) {
	int owned = accumulate(all(a),0);
    int n = a.size(), m = u.size();
    vector<int> resp(n);
    matrix<int> g(n), rev(n);
    bool flag = 1;
    for(int i = 0; i < m; i++){
        g[u[i]].push_back(v[i]);
        rev[v[i]].push_back(u[i]);
        flag&=v[i] == u[i] || v[i] == u[i]+1;
    }
    if(owned == n){
        for(int i = 0; i < n; i++){
            if(!r[i])
                continue;
            vector<int> reach(n), reachedby(n);
            auto dfs =[&](int id, auto dfs)->void{
                reach[id] = 1;
                for(int i : g[id])
                    if(!reach[i]) dfs(i,dfs);
            };
            auto rdfs =[&](int id, auto dfs)->void{
                reachedby[id] = 1;
                for(int i : rev[id])
                    if(!reachedby[i]) dfs(i,dfs);
            };
            for(int j : g[i])
                dfs(j,dfs);
            for(int j : rev[i])
                rdfs(j,rdfs);
            if(reach[i]){
                for(int j = 0; j < n; j++)
                    resp[j]|=reachedby[j];
            }
        }       
        
    } else if(owned == 0){
        for(int i = 0; i < n; i++){
            if(r[i])
                continue;
            vector<int> reach(n), reachedby(n);
            auto dfs =[&](int id, auto dfs)->void{
                reach[id] = 1;
                for(int i : g[id])
                    if(!reach[i] && !r[i]) dfs(i,dfs);
            };
            auto rdfs =[&](int id, auto dfs)->void{
                reachedby[id] = 1;
                for(int i : rev[id])
                    if(!reachedby[i]) dfs(i,dfs);
            };
            for(int j : g[i])
                if(!r[j])dfs(j,dfs);
            for(int j : rev[i])
                rdfs(j,rdfs);
            if(reach[i]){
                for(int j = 0; j < n; j++)
                    resp[j]|=reachedby[j];
            }
        } 
        for(int& i : resp)
            i^=1;
    } else if(flag){
        for(int i = n-1; i >= 0; i--){
            int t1 = 0, t2 = 0;
            for(int j : g[i]){
                if(j == i)
                    t1 = 1;
                else if(j == i+1)
                    t2 = 1;
            }
            if(a[i]){
                if(t2){
                    resp[i] = resp[i+1];
                }
                if(t1 && r[i])
                    resp[i] = 1;
            } else {
                resp[i] = 1;
                if(t2){
                    resp[i] = resp[i+1];
                }
                if(t1 && !r[i])
                    resp[i] = 0;
            }
        }
    } else {
        vector<int> power(16,1);
        for(int i = 1; i < 16; i++)
            power[i] = power[i-1]*3;
        matrix<int> can(power[n],vector<int>(n));
        auto getbit =[&](int x, int id){
            return( x%(power[id]*3)-x%power[id])/power[id];
        };
        auto solve=[&](int id, int mask, auto solve)->int{
            int resp = a[id]^1;
            for(int i : g[id]){
                int newmask = mask;
                int state = getbit(mask,i);
                // << id << ' ' << mask << "=>" << i << ":\n";
                if(state == 1){
                    // << 'a' << '\n';
                    if(!a[id]){
                        resp = 0;
                        break;
                    }
                } else if(state == 2){
                    // << 'b' << '\n';
                    if(a[id]){
                        resp = 1;
                        break;
                    }
                } else {
                    if(r[i]){
                        for(int j = 0; j < n; j++){
                            if(getbit(newmask,j) == 1){
                                newmask+=power[j];
                            }
                        }
                        newmask+=power[i]*2;
                    } else {
                        newmask+=power[i];
                    }
                    // << newmask << '\n';
                    int cur = solve(i,newmask,solve);
                    if(cur == a[id]){
                        resp = cur;
                        break;
                    }
                }
            }
            // << id << ' ' << mask << " tem resp " << resp << '\n';
            return resp;
        };
        for(int i = 0; i < n; i++){
            int mask = power[i]*(1+r[i]);
            resp[i] = solve(i,mask,solve);
        }
    }
	return resp;
}

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