結果

問題 No.614 壊れたキャンパス
ユーザー rickytheta
提出日時 2017-12-14 01:08:53
言語 C++11(廃止可能性あり)
(gcc 13.3.0)
結果
AC  
実行時間 860 ms / 2,000 ms
コード長 2,317 bytes
コンパイル時間 1,888 ms
コンパイル使用メモリ 181,504 KB
実行使用メモリ 71,112 KB
最終ジャッジ日時 2024-12-14 10:43:48
合計ジャッジ時間 11,539 ms
ジャッジサーバーID
(参考情報)
judge5 / judge2
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
other AC * 20
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:44:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   44 |   scanf("%d%d%d%d%d",&n,&m,&k,&s,&t);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:45:16: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   45 |   REP(i,m)scanf("%d%d%d",a+i,b+i,c+i);
      |           ~~~~~^~~~~~~~~~~~~~~~~~~~~~

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef int _loop_int;
#define REP(i,n) for(_loop_int i=0;i<(_loop_int)(n);++i)
#define FOR(i,a,b) for(_loop_int i=(_loop_int)(a);i<(_loop_int)(b);++i)
#define FORR(i,a,b) for(_loop_int i=(_loop_int)(b)-1;i>=(_loop_int)(a);--i)
#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define DEBUG_VEC(v) cout<<#v<<":";REP(i,v.size())cout<<" "<<v[i];cout<<endl
#define ALL(a) (a).begin(),(a).end()
#define CHMIN(a,b) a=min((a),(b))
#define CHMAX(a,b) a=max((a),(b))
// mod
const ll MOD = 1000000007ll;
#define FIX(a) ((a)%MOD+MOD)%MOD
// floating
typedef double Real;
const Real EPS = 1e-11;
#define EQ0(x) (abs(x)<EPS)
#define EQ(a,b) (abs(a-b)<EPS)
typedef complex<Real> P;
int n,m,k,s,t;
int a[252521], b[252521], c[252521];
vi po[252521];
map<pii,int> vrtx;
vector<pii> g[425252];
ll dist[425252];
int main(){
scanf("%d%d%d%d%d",&n,&m,&k,&s,&t);
REP(i,m)scanf("%d%d%d",a+i,b+i,c+i);
po[0].push_back(s);
po[n-1].push_back(t);
REP(i,m){
a[i]--;
po[a[i]].push_back(b[i]);
po[a[i]+1].push_back(c[i]);
}
int it = 0;
REP(i,n){
sort(ALL(po[i]));
po[i].erase(unique(ALL(po[i])), po[i].end());
REP(j,po[i].size()){
vrtx[pii(i,po[i][j])] = it++;
}
REP(j,po[i].size()-1){
int from = vrtx[pii(i,po[i][j])];
int to = vrtx[pii(i,po[i][j+1])];
int sa = po[i][j+1] - po[i][j];
g[from].push_back(pii(to,sa));
g[to].push_back(pii(from,sa));
}
}
REP(i,m){
int from = vrtx[pii(a[i], b[i])];
int to = vrtx[pii(a[i]+1, c[i])];
g[from].push_back(pii(to,0));
}
const ll INF = 1e18;
REP(i,it)dist[i] = INF;
priority_queue<pll> Q;
int start = vrtx[pii(0,s)];
dist[start] = 0ll;
Q.push(pll(-dist[start], start));
while(!Q.empty()){
ll d = Q.top().first;
int pos = Q.top().second; Q.pop();
if(dist[pos] != -d)continue;
for(pii P : g[pos]){
int to = P.first;
int cost = P.second;
if(dist[pos] + cost < dist[to]){
dist[to] = dist[pos] + cost;
Q.push(pll(-dist[to], to));
}
}
}
int goal = vrtx[pii(n-1,t)];
if(dist[goal] == INF){
dist[goal] = -1;
}
cout<<dist[goal]<<endl;
return 0;
}
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