제출 #1244062

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1244062		cpdreamer	봉쇄 시간 (IOI23_closing)	C++17	75 / 100	263 ms	5188 KiB

closing

#include "closing.h"

#include <vector>
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
const long long INF = 1e18+1;
typedef long long ll;
const ll MOD =  1e9+7;
#define F first
#define P pair
#define S second
#define pb push_back
#define all(v) v.begin(), v.end()
typedef tree<int,null_type,less<int>,rb_tree_tag,
tree_order_statistics_node_update> indexed_set;
void file() {
    freopen("input.txt","r",stdin);
    freopen("output.txt","w",stdout);
}
vector<P<int,ll>>adj[(int)3001];
bool b[(int)3001];
ll d1[(int)3001];
ll d2[(int)3001];
void dfs1(int n,int p,int y) {
    if (n==y) {
        b[n]=true;
        return;
    }
    for (auto [u,w]:adj[n]) {
        if (u==p)continue;
        dfs1(u,n,y);
        b[n]|=b[u];
    }
}
void dfs2(int n,int p) {
    for (auto [u,w]:adj[n]) {
        if (u==p)continue;
        d1[u]=d1[n]+w;
        dfs2(u,n);
    }
}
void dfs3(int n,int p) {
    for (auto [u,w]:adj[n]) {
        if (u==p)continue;
        d2[u]=d2[n]+w;
        dfs3(u,n);
    }
}
int max_score(int N, int X, int Y, long long K,
              std::vector<int> U, std::vector<int> V, std::vector<int> W)
{
    for (int i=0;i<=N;i++) {
        adj[i].clear();
        b[i]=false;
    }
    d1[X]=0;d2[Y]=0;
    for (int i=0;i<N-1;i++) {
        adj[U[i]].pb({V[i],W[i]});
        adj[V[i]].pb({U[i],W[i]});
    }
    dfs1(X,-1,Y);
    dfs2(X,-1);
    dfs3(Y,-1);
    for (int i=0;i<N;i++) {
        if (d1[i]>d2[i])swap(d1[i],d2[i]);
    }
    ll dp1[2*N+1],dp2[2*N+1];
    for (int i=0;i<2*N+1;i++) {
        dp1[i]=INF;dp2[i]=INF;
    }
    dp1[0]=0LL,dp2[0]=0LL;
    for (int i=0;i<N;i++) {
        for (int j=2*N;j>=1;j--) {
            dp1[j]=min(dp1[j],dp1[j-1]+d1[i]);
            if (b[i]) {
                dp2[j]=min(dp2[j],dp2[j-1]+d2[i]-d1[i]);
            }
            else {
                dp2[j]=min(dp2[j],dp2[j-1]+d1[i]);
                if (j>=2) {
                    dp2[j]=min(dp2[j],dp2[j-2]+d2[i]);
                }
            }
        }
    }
    int ans=0;
    int c=0;ll cst=0;
    for (int i=0;i<N;i++) {
        if (b[i]) {
            c++;
            cst+=d1[i];
        }
    }
    for (int i=1;i<=2*N;i++) {
        if (dp1[i]<=K) {
            ans=max(ans,i);
        }
        if (dp2[i]+cst<=K) {
            ans=max(ans,c+i);
        }
    }
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

closing.cpp: In function 'void file()':
closing.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen("input.txt","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
closing.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen("output.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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