Submission #1034636

#TimeUsernameProblemLanguageResultExecution timeMemory
1034636lovrotWerewolf (IOI18_werewolf)C++17
0 / 100
457 ms524288 KiB
#include "werewolf.h" #include <cstdio> #include <algorithm> #include <vector> #include <cstring> #define X first #define Y second #define PB push_back using namespace std; typedef pair<int, int> pii; typedef vector<int> vi; const int LOG = 18; const int N = 1 << LOG; struct quest { int l, r, a, b; quest() {} quest(int l, int r, int a, int b) : l(l), r(r), a(a), b(b) {} }; quest q[N]; vector<int> g[N], h[N]; int un[N], iv[N], ma[N]; int trazi(int u) { if(un[u] == -1) { return u; } return un[u] = trazi(un[u]); } void unija(int u, int v) { u = trazi(u); if(u == v) { return; } un[u] = v; h[v].PB(u); } int up[N][LOG], val[N]; void dfs(int u, vector<int> &p) { iv[u] = p.size(); for(int v : h[u]) { up[v][0] = u; // printf("%d %d\n", u, v); dfs(v, p); } ma[u] = p.size(); if(h[u].empty()) { p.PB(u); } } int climb(int u, int x, bool f) { for(int i = LOG - 1; i >= 0; --i) { if((val[up[u][i]] >= x) == f) { u = up[u][i]; } } return u; } int t[2 * N]; // memset -1 void update(int u, int x) { u += N; t[u] = x; for(u >>= 1; u; u >>= 1) { t[u] = max(t[2 * u], t[2 * u + 1]); } } int query(int l, int r, int u = 1, int lo = 0, int hi = N) { if(r <= lo || hi <= l) { return -1; } if(l <= lo && hi <= r) { return t[u]; } int mi = (lo + hi) / 2; return max(query(l, r, 2 * u, lo, mi), query(l, r, 2 * u + 1, mi, hi)); } vector<int> qi[N]; vi check_validity(int n, vi X, vi Y, vi S, vi E, vi L, vi R) { int m = S.size(); vector<int> ans(m); for(int i = 0; i < X.size(); ++i) { g[X[i]].PB(Y[i]); g[Y[i]].PB(X[i]); } // n - 1, n - 2, ... 0 memset(un, -1, sizeof(un)); for(int i = n - 2, j = n; i >= 0; --i, ++j) { unija(i, j); val[j] = i; up[j][0] = j; for(int v : g[i]) { if(v > i) { unija(v, j); } } } vector<int> a; dfs(2 * n - 2, a); for(int i = 1; i < LOG; ++i) { for(int j = 0; j < 2 * n - 1; ++j) { up[j][i] = up[up[j][i - 1]][i - 1]; } } for(int i = 0; i < m; ++i) { int res = climb(S[i], L[i], 1); q[i].l = iv[res]; q[i].r = ma[res]; qi[q[i].r - 1].PB(i); // printf("%d %d lr %d %d\n", i, res, q[i].l, q[i].r); } // 0, 1, ... n - 1 memset(un, -1, sizeof(un)); for(int i = 1, j = n; i < n; ++i, ++j) { h[j].clear(); unija(i, j); val[j] = i; up[j][0] = j; for(int v : g[i]) { if(v < i) { unija(v, j); } } } vector<int> b; dfs(2 * n - 2, b); for(int i = 1; i < LOG; ++i) { for(int j = 0; j < 2 * n - 1; ++j) { up[j][i] = up[up[j][i - 1]][i - 1]; } } for(int i = 0; i < m; ++i) { int res = climb(E[i], R[i] + 1, 0); q[i].a = iv[res]; q[i].b = ma[res]; // printf("%d %d\n", E[i], R[i]); // printf("%d %d ab %d %d\n", i, res, q[i].a, q[i].b); } for(int i = 0; i < n; ++i) { val[b[i]] = i; } memset(t, -1, sizeof(t)); for(int i = 0; i < n; ++i) { update(val[a[i]], i); for(int j : qi[i]) { // printf("%d %d : %d %d %d %d\n", i, j, q[j].a, q[j].b, q[j].l, query(q[j].a, q[j].b + 1)); if(query(q[j].a, q[j].b + 1) >= q[j].l) { ans[j] = 1; } } } return ans; }

Compilation message (stderr)

werewolf.cpp: In function 'vi check_validity(int, vi, vi, vi, vi, vi, vi)':
werewolf.cpp:91:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |  for(int i = 0; i < X.size(); ++i) {
      |                 ~~^~~~~~~~~~
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