Submission #805509

#TimeUsernameProblemLanguageResultExecution timeMemory
805509hariaakas646Watching (JOI13_watching)C++17
50 / 100
1049 ms6272 KiB
#include <bits/stdc++.h> using namespace std; #define scd(t) scanf("%d", &t) #define sclld(t) scanf("%lld", &t) #define forr(i, j, k) for (int i = j; i < k; i++) #define frange(i, j) forr(i, 0, j) #define all(cont) cont.begin(), cont.end() #define mp make_pair #define pb push_back #define f first #define s second typedef long long int lli; typedef pair<int, int> pii; typedef vector<int> vi; typedef vector<bool> vb; typedef vector<lli> vll; typedef vector<string> vs; typedef vector<pii> vii; typedef vector<vi> vvi; typedef map<int, int> mpii; typedef set<int> seti; typedef multiset<int> mseti; typedef long double ld; vi vec; int n, p, q; bool check(int w) { vvi dp(n + 1, vi(p + 1)); frange(i, p + 1) dp[0][i] = 0; forr(i, 1, n + 1) { frange(j, p + 1) { int v = 0; auto it = lower_bound(all(vec), vec[i] - 2 * w + 1); if (it != vec.begin()) { it--; v = dp[it - vec.begin()][j]; } dp[i][j] = v + 1; if (j > 0) { it = lower_bound(all(vec), vec[i] - w + 1); v = 0; if (it != vec.begin()) { it--; v = dp[it - vec.begin()][j - 1]; } dp[i][j] = min(dp[i][j], v); } } } return dp[n][p] <= q; } int main() { scd(n); scd(p); scd(q); if (p + q >= n) { printf("1"); return 0; } vec = vi(n + 1); forr(i, 1, n + 1) scd(vec[i]); sort(all(vec)); int lo = 1; int hi = 1e9; while (lo != hi) { int mid = (lo + hi) / 2; if (check(mid)) { hi = mid; } else lo = mid + 1; } printf("%d", lo); }

Compilation message (stderr)

watching.cpp: In function 'int main()':
watching.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
watching.cpp:65:5: note: in expansion of macro 'scd'
   65 |     scd(n);
      |     ^~~
watching.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
watching.cpp:66:5: note: in expansion of macro 'scd'
   66 |     scd(p);
      |     ^~~
watching.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
watching.cpp:67:5: note: in expansion of macro 'scd'
   67 |     scd(q);
      |     ^~~
watching.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
watching.cpp:74:23: note: in expansion of macro 'scd'
   74 |     forr(i, 1, n + 1) scd(vec[i]);
      |                       ^~~
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