제출 #1335356

#제출 시각아이디문제언어결과실행 시간메모리
1335356kokokaiMagenta (COCI21_magenta)C++20
30 / 110
54 ms14740 KiB
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
const int N = 1e5+5;
const int LG = 18;
int anc[N][LG];
int n,n0,n1;
struct edge{
    int v,color;
};
vector<edge> adj[N];
int d[3][N];
void dfs(int u,int p){
    anc[u][0]=p;
    for(int lg=1;lg<LG;lg++) anc[u][lg]=anc[anc[u][lg-1]][lg-1];
    for(edge e:adj[u]){
        int v=e.v;
        if(v == p) continue;
        d[2][v]=d[2][u]+1;
        d[1][v]=d[1][u] + (e.color != 0);
        d[0][v]=d[0][u] + (e.color != 1);
        dfs(v,u);
    }
}
int lca(int u,int v){
    if(d[2][u] < d[2][v]) swap(u,v);
    int dis=d[2][u]-d[2][v];
    for(int lg=LG-1;lg>=0;lg--){
        if((dis&(1<<lg))>0) u=anc[u][lg];
    }
    if(u == v) return u;
    for(int lg=LG-1;lg>=0;lg--){
        if(anc[u][lg] != anc[v][lg]){
            u=anc[u][lg];
            v=anc[v][lg];
        }
    }
    return anc[u][0];
}
int dist(int u,int v,int c){
    int lc=lca(u,v);
    return d[c][u]+d[c][v]-2*d[c][lc];
}
int findlc(int a,int b,int c){
    vector<int> lc;
    lc.push_back(lca(a,b));
    lc.push_back(lca(a,c));
    lc.push_back(lca(b,c));
    sort(lc.begin(),lc.end(),[&](int i,int j){
        return d[2][i] > d[2][j];
    });
    return lc[0];
}
signed main(){
    ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    if(fopen("text.inp","r")){
        freopen("text.inp","r",stdin);
    }
    cin>>n;
    cin>>n0>>n1;
    for(int i=1;i<n;i++){
        int u,v,c;
        string s;
        cin>>u>>v>>s;
        if(s == "plava") c=0;
        else if(s == "crvena") c=1;
        else c=2;
        adj[u].push_back({v,c});
        adj[v].push_back({u,c});
    }
    dfs(1,0);
    if((dist(n0,n1,2))%2 == 0){
        bool has=0;
        for(int u=1;u<=n;u++){
            if(has) break;
            if(dist(n0,u,0) != dist(n0,u,2) && dist(n1,u,1) == dist(n1,u,2)){
                int lc=findlc(u,n0,n1);
                if(dist(n0,lc,0) != dist(n0,lc,2)) has=1;
                else{
                    if(dist(n0,lc,2) > dist(n1,lc,2)) has=1;
                }
            }
        }
        if(has) cout<<"Magenta\n";
        else cout<<"Paula\n";
    }else{
        bool has=0;
        for(int u=1;u<=n;u++){
            if(has) break;
            if(dist(n0,u,0) == dist(n0,u,2) && dist(n1,u,1) != dist(n1,u,2)){
                int lc=findlc(u,n0,n1);
                if(dist(n1,lc,1) != dist(n1,lc,2)) has=1;
                else{
                    if(dist(n1,lc,2) >= dist(n0,lc,2)) has=1;
                }
            }
        }
        if(has) cout<<"Magenta\n";
        else cout<<"Marin\n";
    }
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen("text.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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