제출 #320436

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
320436		wildturtle	꿈 (IOI13_dreaming)	C++14	18 / 100	76 ms	22244 KiB

dreaming

#include "dreaming.h"
#include<bits/stdc++.h>
using namespace std;
int a,b,c,d,i,e,f,g,n,m,k,l,fix[500005],maxx,idx,maxx1;
vector < pair <int,int> > v[500005];
vector <int> v1;
stack <int> ms;
void dfs(int x,int y,int z) {
    fix[x]=1;
    if(maxx<z) { maxx=z; idx=x; }
    for(int i=0;i<v[x].size();i++) {
        if(v[x][i].first==y) continue;
        dfs(v[x][i].first,x,z+v[x][i].second);
    }
}
void dfs1(int x,int y,int z,int p) {
    if(z!=-1 && k==0) ms.push(v[z][p].second);
    for(int i=0;i<v[x].size();i++) {
        if(v[x][i].first==z) continue;
        dfs1(v[x][i].first,y,x,i);
    }
    if(x==y) k=1;
    if(k==0) ms.pop();
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    for(int i=0;i<M;i++) {
        v[A[i]].push_back( { B[i] , T[i] } );
        v[B[i]].push_back( { A[i] , T[i] } );
    }
    for(int i=0;i<N;i++) {
        if(fix[i]) continue;
        //cout<<i<<" ";
        maxx=0; idx=-1;
        dfs(i,-1,0);
        a=idx;
        maxx=0; idx=-1;
        dfs(a,-1,0);
        b=idx;
        maxx1=max(maxx1,maxx); k=0;
        dfs1(a,b,-1,0);
        //cout<<a<<" "<<b<<" "<<maxx<<" ";
        if(ms.empty()) v1.push_back(0); 
        a=0;
        while(!ms.empty()) {
            //cout<<ms.top()<<"-";
            a+=ms.top();
            if(a==maxx/2) { v1.push_back(maxx/2); break; }
            else if(a>maxx/2) {
                v1.push_back(min(a,max(a-ms.top(),maxx-a+ms.top())));
                break;
            }
            ms.pop();
        }
        while(!ms.empty()) ms.pop();
        //cout<<v1[v1.size()-1]<<endl;
    }
    sort(v1.begin(),v1.end());
    if(v1.size()>=2) maxx1=max(maxx1,v1[v1.size()-1]+v1[v1.size()-2]+L);
    if(v1.size()>=3) maxx1=max(maxx1,v1[v1.size()-2]+v1[v1.size()-3]+2*L);
    return maxx1;
}/*
int main() {
    int a1[]={0,8,2,5,5,1,1,10};
    int b1[]={8,2,7,11,1,3,9,6};
    int c1[]={4,2,4,3,7,1,5,3};
    cout<<travelTime(12, 8, 2, a1, b1, c1);
}*/

컴파일 시 표준 에러 (stderr) 메시지

dreaming.cpp: In function 'void dfs(int, int, int)':
dreaming.cpp:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for(int i=0;i<v[x].size();i++) {
      |                 ~^~~~~~~~~~~~
dreaming.cpp: In function 'void dfs1(int, int, int, int)':
dreaming.cpp:18:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(int i=0;i<v[x].size();i++) {
      |                 ~^~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 18 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23