제출 #798028

#제출 시각아이디문제언어결과실행 시간메모리
798028LittleCubeToy Train (IOI17_train)C++17
컴파일 에러
0 ms0 KiB
#include "train.h" #include <bits/stdc++.h> using namespace std; int n, m, k, vis[5005], scc[5005]; vector<int> E[5005], R[5005]; vector<int> order; vector<int> cc[5005]; void dfs(int u) { vis[u] = 1; for (auto v : E[u]) if (!vis[v]) dfs(v); order.emplace_back(u); } void dfscc(int u, int c) { vis[u] = 1; scc[u] = c; cc[c].emplace_back(u); for (auto v : R[u]) if (!vis[v]) dfscc(v, c); } vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v) { n = a.size(), m = u.size(), k = 0; for (int i = 0; i < n; i++) vis[i] = 0, E[i].clear(), R[i].clear(), cc[i].clear(); for (int i = 0; i < m; i++) if (a[u[i]] == 1 && a[v[i]] == 1) { E[u[i]].emplace_back(v[i]); R[v[i]].emplace_back(u[i]); } for (int i = 0; i < n; i++) if (!vis[i]) dfs(i); reverse(order.begin(), order.end()); for (int i = 0; i < n; i++) vis[i] = 0; for (int i : order) if (!vis[i]) dfscc(i, k++); sort(order.begin(), order.end(), [&](int i, int j) { return cc[i] > cc[j]; }); vector<int> ans(n, 0); for (int i = k - 1; i >= 0; i--) { int flag = 0; for (int j : cc[i]) { for (int p : E[j]) if (ans[p]) flag = 1; if(r[j] == 1) flag = 1; } if(flag) for (int j : cc[i]) ans[j] = 1; } return ans; vector<int> loop(n, 0); for (int i = 0; i < n; i++) if (a[i] == 0) { vector<int> req(n, 0); for (int j = 0; j < n; j++) if (r[j]) req[j] = 1e9; else if (a[j]) req[j] = E[j].size(); else req[j] = 1; queue<int> q; q.push(i); while (!q.empty()) { int x = q.front(); q.pop(); for (auto y : R[x]) if (--req[y] == 0) q.emplace(y); } loop[i] = req[i] <= 0; } vector<int> ans(n, 1); vector<int> req(n, 0); queue<int> q; for (int j = 0; j < n; j++) if (loop[j]) { q.push(j); req[j] = 0; } else if (a[j]) req[j] = E[j].size(); else req[j] = 1; while (!q.empty()) { int x = q.front(); ans[x] = 0; q.pop(); for (auto y : R[x]) if (--req[y] == 0) q.emplace(y); } return ans; }

컴파일 시 표준 에러 (stderr) 메시지

train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:97:14: error: redeclaration of 'std::vector<int> ans'
   97 |  vector<int> ans(n, 1);
      |              ^~~
train.cpp:54:14: note: 'std::vector<int> ans' previously declared here
   54 |  vector<int> ans(n, 0);
      |              ^~~