제출 #379528

#제출 시각아이디문제언어결과실행 시간메모리
379528SuhaibSawalha1슈퍼트리 잇기 (IOI20_supertrees)C++14
컴파일 에러
0 ms0 KiB
#include <bits/stdc++.h> using namespace std; void build (vector<vector<int>> p) { for (auto &i : p) { for (int j : i) cout << j << " "; cout << "\n"; } } struct DSU { vector<int> dsu, sz; DSU (int n) { dsu.resize(n); iota(dsu.begin(), dsu.end(), 0); sz.resize(n, 1); } int find (int u) { return u == dsu[u] ? u : dsu[u] = find(dsu[u]); } bool unite (int u, int v) { if ((u = find(u)) != (v = find(v))) { if (sz[u] < sz[v]) { swap(u, v); } dsu[v] = u; sz[u] += sz[v]; return 1; } return 0; } }; int construct(vector<vector<int>> p) { int n = p.size(); vector<vector<int>> ans(n, vector<int>(n)); DSU nodes(n); bool two = 0; auto sit = [&] (int i, int j, int t) { ans[i][j] = ans[j][i] = t; }; for (int i = 0; i < n; ++i) { for (int j = i + 1; j < n; ++j) { if (p[i][j] == 1) { sit(i, j, nodes.unite(i, j)); } } } for (int i = 0; i < n; ++i) { for (int j = 0; j < n; ++j) { if (p[i][j] == 0 && nodes.find(i) == nodes.find(j)) { return 0; } } } vector<vector<int>> c(n); for (int i = 0; i < n; ++i) { c[nodes.find(i)].push_back(i); } DSU cmp(n); for (int i = 0; i < n; ++i) { for (int j = 0; j < n; ++j) { if (p[i][j] == 2) { cmp.unite(nodes.find(i), nodes.find(j)); } } } vector<vector<int>> C(n); for (int i = 0; i < n; ++i) { C[cmp.find(i)].push_back(i); } for (int i = 0; i < n; ++i) { if (i != cmp.find(i)) { continue; } for (int j = 0; j < n; ++j) { if (nodes.find(i) != nodes.find(j) && cmp.find(i) == cmp.find(j) && p[i][j] != 2) { return 0; } } for (int j : c[i]) { for (int k = 0; k < n; ++k) { if ((p[k][i] == 2) ^ (p[j][k] == 2)) { return 0; } } } for (int j = 0; j < C[i].size(); ++j) { for (int k = j + 1; k < C[i].size(); ++k) { if (p[C[i][j]][C[i][k]] ^ 2) { return 0; } } } if (C[i].size() == 2) { return 0; } if (C[i].size() > 2) { sit(C[i][0], C[i][1], 1); sit(C[i][1], C[i][2], 1); for (int j = 3; j < C[i].size(); ++j) { sit(C[i][j], C[i][j - 1], 1); } sit(C[i].back(), C[i][0], 1); } } build(ans); return 1; } int main (){ #ifndef ONLINE_JUDGE freopen("SuhaibSawalha1","r",stdin); #endif ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); int n; cin >> n; vector<vector<int>> a(n, vector<int>(n)); for (int i = 0; i < n; ++i) { for (int j = 0; j < n; ++j) { cin >> a[i][j]; } } construct(a); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'void build(std::vector<std::vector<int> >)':
supertrees.cpp:6:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    6 |     for (int j : i) cout << j << " "; cout << "\n";
      |     ^~~
supertrees.cpp:6:39: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
    6 |     for (int j : i) cout << j << " "; cout << "\n";
      |                                       ^~~~
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:91:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |     for (int j = 0; j < C[i].size(); ++j) {
      |                     ~~^~~~~~~~~~~~~
supertrees.cpp:92:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |       for (int k = j + 1; k < C[i].size(); ++k) {
      |                           ~~^~~~~~~~~~~~~
supertrees.cpp:104:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  104 |       for (int j = 3; j < C[i].size(); ++j) {
      |                       ~~^~~~~~~~~~~~~
supertrees.cpp:41:8: warning: unused variable 'two' [-Wunused-variable]
   41 |   bool two = 0;
      |        ^~~
supertrees.cpp: In function 'int main()':
supertrees.cpp:117:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  117 |     freopen("SuhaibSawalha1","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/ccv7bak6.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cc0FAeCK.o:supertrees.cpp:(.text.startup+0x0): first defined here
/tmp/ccv7bak6.o: In function `build(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)':
grader.cpp:(.text+0x1d0): multiple definition of `build(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)'
/tmp/cc0FAeCK.o:supertrees.cpp:(.text+0x0): first defined here
collect2: error: ld returned 1 exit status