Submission #43215

#	Time	Username	Problem	Language	Result	Execution time	Memory
43215		smu201111192	버스 (JOI14_bus)	C++14	35 / 100	391 ms	63004 KiB

bus

#include <iostream>
#include <cstdio>
#include <cassert>
#include <bitset>
#include <string>
#include <sstream>
#include <algorithm>
#include <set>
#include <numeric>
#include <cmath>
#include <map>
#include <vector>
#include <queue>
#include <stack>
#include <cstring>
#include <queue>
#include <numeric>
#include <iomanip>
#define ll long long
using namespace std;
const int MAXN = 100005;
const int MAXV = 500005;
int n,m,id = 0;
map<pair<int,int>,int> dict;
pair<int,int> cv[MAXV];
vector<int> adj[MAXV];
vector<int> node[MAXN];
struct edge{
    int u,v,st,ed;
    void read(){cin>>u>>v>>st>>ed;}
}e[MAXN];
int dp[MAXV];
void addEdge(int u,int v){
    adj[v].push_back(u);
}
//n에 도착할 수 있는 가장 늦은 시점을 구하자.
int main(){
    ios::sync_with_stdio(false); cin.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= m; i++){
        e[i].read();
        dict[{e[i].u,e[i].st}];
        dict[{e[i].v,e[i].ed}];
        node[e[i].u].push_back(e[i].st);
        node[e[i].v].push_back(e[i].ed);
    }
    for(int i = 1; i <= n; i++) {
        sort(node[i].begin(),node[i].end());
        node[i].erase(unique(node[i].begin(),node[i].end()),node[i].end());
    }
    vector<pair<int,int> > ord;
    for(auto it = dict.begin(); it!= dict.end(); it++){
        it->second = ++id;
        cv[id] = it->first;
        ord.push_back({it->first.second,id});
    }
    for(int i = 1; i <= n; i++){
        for(int j = 0; j < (int)node[i].size() - 1; j++){
            int tu = node[i][j];
            int tv = node[i][j+1];
            addEdge(dict[make_pair(i,tu)],dict[make_pair(i,tv)]);
        }
    }
    for(int i = 1; i <= m; i++){
        int u = e[i].u; int v = e[i].v;
        int st = e[i].st; int ed = e[i].ed;
        addEdge(dict[{u,st}],dict[{v,ed}]);
    }
    sort(ord.begin(),ord.end());
    reverse(ord.begin(),ord.end());
    memset(dp,0x3f3f3f3f,sizeof(dp));
    
    for(int i = 0; i<ord.size();i++){
        int x = ord[i].second;
        int tm = ord[i].first;
        int pv = cv[x].first;
        if(pv == n)
            dp[x] = tm;
        for(auto y:adj[x])
            dp[y] = min(dp[y],dp[x]);
    }
    
    int Q; cin>> Q;
    if(Q > 10000){
        assert(1);
    }
    for(int i = 1; i <= Q; i++){
        int tm; cin >> tm;
        if(node[1].size() == 0) {
            cout<<-1; continue;
        }
        int lo = 0; int hi = node[1].size() - 1;
        int ret = -1;
        while(lo <= hi){
            int mid = (lo + hi)/2;
            int t = node[1][mid];
            //요시간에 출발하면 언제 도착혀?
            int v = dict[{1,t}];
            if(dp[v] <= tm){
                ret = max(ret,t);
                lo = mid + 1;
            }
            else hi = mid - 1;
        }
        cout<<ret<<"\n";
    }
    
    return 0;
}

Compilation message (stderr)

bus.cpp: In function 'int main()':
bus.cpp:73:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i<ord.size();i++){
                     ^

• Subtask 1: 20 / 20
• Subtask 2: 15 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 50