제출 #1001701

#제출 시각아이디문제언어결과실행 시간메모리
1001701nomuluun경주 (Race) (IOI11_race)C++14
43 / 100
3090 ms134224 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; int k, mn = INT_MAX; vector<vector<int>> dp(200001, vector<int>(101, INT_MAX)); // sum I and ends at node v is the minimum of the paths vector<pair<int, int>> adj[200001]; // save edges vector<vector<pair<int, int>>> path; bool vis[200005]={0}; vector<pair<int,int>>v[200005]; ll mi=INT_MAX; // keep the best paths of each weights void DFS(int q, int dis, int hi, int ka){ int m=v[q].size(); if(dis==ka){ if(hi<mi)mi=hi; } for(int i=0; i<m; i++){ int k=v[q][i].first; ll cost=v[q][i].second; if(!vis[k]){ vis[k]=1; DFS(k,dis+cost,hi+1,ka); } } } void dfs(int v, int p) { dp[v][0] = 0; for (auto [i, w] : adj[v]) if (i != p) dfs(i, v); path.assign(k + 1, {}); for (auto [i, w] : adj[v]) { if (i == p) continue; for (int j = w; j <= k; j++) { if (dp[i][j - w] == INT_MAX) continue; if (path[j].size() < 2) path[j].push_back({dp[i][j - w] + 1, i}); // keep best two paths else if (dp[i][j - w] + 1 < path[j][1].first) path[j][1] = {dp[i][j - w] + 1, i}; // keep current path if (path[j].size() == 2 && path[j][0].first > path[j][1].first) swap(path[j][0], path[j][1]); // swap shortest path dp[v][j] = min(dp[v][j], dp[i][j - w] + 1); } } if (!path[k].empty()) mn = min(mn, path[k][0].first); // if there is any path which is exactly K for (int i = 1; i < k; i++) { if (path[i].empty() || path[k - i].empty()) continue; if (path[i][0].second != path[k - i][0].second) mn = min(mn, path[i][0].first + path[k - i][0].first); // compare 2 best paths else if (1 < path[k - i].size()) mn = min(mn, path[i][0].first + path[k - i][1].first); // compare 2 best paths if there is path over 1. } } int best_path(int N, int K, int H[][2], int L[]) { if(K<=100){ k = K; for (int i = 0; i < N - 1; i++) { adj[H[i][0]].push_back({H[i][1], L[i]}); adj[H[i][1]].push_back({H[i][0], L[i]}); } dfs(0, -1); if (mn == INT_MAX) return -1; else return mn; } else{ for(int i=0; i<N-1; i++){ v[H[i][0]].push_back({H[i][1], L[i]}); v[H[i][1]].push_back({H[i][0], L[i]}); } for(int i=0; i<=N-1; i++){ for(int i=0; i<N; i++){ vis[i]=0; } vis[i]=1; DFS(i,0,0,K); //ehleh oroi distance highway } if(mi==INT_MAX)return -1; else return mi; } } #define MAX_N 500000 static int N, K; static int H[MAX_N][2]; static int L[MAX_N]; static int solution; //inline void my_assert(int e) //{ // if (!e) // abort(); //} // //void read_input() //{ // int i; // my_assert(2 == scanf("%d %d", &N, &K)); // for (i = 0; i < N - 1; i++) // my_assert(3 == scanf("%d %d %d", &H[i][0], &H[i][1], &L[i])); // my_assert(1 == scanf("%d", &solution)); //} // //int main() //{ // int ans; // read_input(); // ans = best_path(N, K, H, L); // if (ans == solution) // printf("Correct.\n"); // else // printf("Incorrect. Returned %d, Expected %d.\n", ans, solution); // // return 0; //}

컴파일 시 표준 에러 (stderr) 메시지

race.cpp: In function 'void dfs(int, int)':
race.cpp:28:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   28 |   for (auto [i, w] : adj[v])
      |             ^
race.cpp:32:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   32 |   for (auto [i, w] : adj[v])
      |             ^
race.cpp: At global scope:
race.cpp:99:12: warning: 'solution' defined but not used [-Wunused-variable]
   99 | static int solution;
      |            ^~~~~~~~
race.cpp:98:12: warning: 'L' defined but not used [-Wunused-variable]
   98 | static int L[MAX_N];
      |            ^
race.cpp:97:12: warning: 'H' defined but not used [-Wunused-variable]
   97 | static int H[MAX_N][2];
      |            ^
race.cpp:96:15: warning: 'K' defined but not used [-Wunused-variable]
   96 | static int N, K;
      |               ^
race.cpp:96:12: warning: 'N' defined but not used [-Wunused-variable]
   96 | static int N, K;
      |            ^
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