Submission #1215969

#TimeUsernameProblemLanguageResultExecution timeMemory
1215969sunflowerExam (eJOI20_exam)C++17
65 / 100
245 ms100372 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long #define MASK(x) (1LL << (x)) #define BIT(x, i) (((x) >> (i)) & 1) #define SZ(x) ((int) (x).size()) #define ALL(a) (a).begin(), (a).end() #define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i) #define FORD(i, a, b) for (int i = (a), _b = (b); i >= _b; --i) #define REP(i, n) for (int i = 0, _n = (n); i < _n; ++i) #define debug(x) cout << "[" << #x << " = " << (x) << "]" << endl #define left __left #define right __right #define prev __prev #define next __next #define fi first #define se second template <class X, class Y> bool maximize(X &x, Y y) { if (x < y) return x = y, true; else return false; } template <class X, class Y> bool minimize(X &x, Y y) { if (x > y) return x = y, true; else return false; } #define MAX_N 100'100 int a[MAX_N + 2], b[MAX_N + 2], lef[MAX_N + 2], rig[MAX_N + 2]; int n; void prepare() { stack <int> st; FOR(i, 1, n) lef[i] = 0, rig[i] = n + 1; FOR(i, 1, n) { while (!st.empty() && a[st.top()] < a[i]) st.pop(); if (!st.empty()) lef[i] = st.top() + 1; st.push(i); } while (!st.empty()) st.pop(); FORD(i, n, 1) { while (!st.empty() && a[st.top()] < a[i]) st.pop(); if (!st.empty()) rig[i] = st.top() - 1; st.push(i); } } namespace subtask1356 { bool check() { return (n <= 5000); } int dp[5050][5050]; void solve() { memset(dp, 0, sizeof(dp)); int ans = 0; FOR(j, 1, n) FOR(i, 1, n) { dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]); if (a[i] == b[j] && lef[i] <= j && j <= rig[i]) { dp[i][j] = dp[i][j - 1] + 1; } maximize(ans, dp[i][j]); } cout << ans; } }; int main() { ios_base::sync_with_stdio(false);cin.tie(nullptr); #define task "test" if (fopen(task".inp","r")) { freopen(task".inp","r",stdin); freopen(task".out","w",stdout); } cin >> n; FOR(i, 1, n) cin >> a[i]; FOR(i, 1, n) cin >> b[i]; prepare(); if (subtask1356 :: check()) return subtask1356 :: solve(), 0; return 0; } /* Discipline - Calm */

Compilation message (stderr)

exam.cpp: In function 'int main()':
exam.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
exam.cpp:84:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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