제출 #872194

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
872194		SalihSahin	Svjetlo (COCI20_svjetlo)	C++14	0 / 110	186 ms	53716 KiB

svjetlo

#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long 
using namespace std;

const int N = 5e5 + 5;
const int mod = 1e9+7;
const int inf = 1e18 + 10;
const int L = 20 * 20 * 20;

vector<int> in(N), adj[N];
vector<int> arr;

void dfs(int node, int par){
    arr.pb(node);
    for(auto itr: adj[node]){
        if(itr != par){
            dfs(itr, node);
        }
    }
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin>>n;
    string s;
    cin>>s;
    for(int i = 0; i < n-1; i++){
        int a, b;
        cin>>a>>b;
        in[a]++;
        in[b]++;
        adj[a].pb(b);
        adj[b].pb(a);
    }
    int uc = 0;
    for(int i = 1; i <= n; i++){
        if(in[i] == 1){
            uc = i;
            break;
        }
    }

    dfs(uc, uc);
    int first = n, last = 0;
    vector<int> tree(n);
    int ans = 0;

    for(int i = 0; i < n; i++){
        tree[i] = s[arr[i] - 1] - '0';
        if(tree[i] == 0){
            first = min(first, i);
            last = max(last, i);
        }
    }
    vector<int> nt;
    for(int i = first; i <= last; i++){
        nt.pb(tree[i]);
    }

    for(int i = 0; i < nt.size(); i++){
        if(i == nt.size()-1 && tree[i] == 1) break;
        if(i == nt.size()-1){
            ans++;
            break;
        }

        if(tree[i] == 0 && tree[i+1] == 0){
            ans += 2;
            i++;
        }
        else if(tree[i] == 1 && tree[i+1] == 1){
            ans += 4;
            i++;
        }
        else if(tree[i] == 0 && tree[i+1] == 1){
            ans++;
        }
        else if(tree[i] == 1 && tree[i+1] == 0){
            tree[i] = 1, tree[i+1] = 1;
            ans += 3;
        }
    }

    cout<<ans<<endl;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

svjetlo.cpp: In function 'int32_t main()':
svjetlo.cpp:64:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i = 0; i < nt.size(); i++){
      |                    ~~^~~~~~~~~~~
svjetlo.cpp:65:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         if(i == nt.size()-1 && tree[i] == 1) break;
      |            ~~^~~~~~~~~~~~~~
svjetlo.cpp:66:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |         if(i == nt.size()-1){
      |            ~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30