Submission #607382

#TimeUsernameProblemLanguageResultExecution timeMemory
607382kawaii Martian DNA (BOI18_dna)C++14
0 / 100
82 ms12008 KiB
#include <bits/stdc++.h> using namespace std; #define int long long #define fi first #define se second int t, n, m, k, b, q, r, a[1000005], num[1000005], dem[1000005], mod = 1e9 + 7; string s; mt19937_64 rng; bool flag[1000005]; int mul(int x, int y){ if(y == 0) return 1; int ans = mul(x, y / 2); if(y % 2 == 0) return (ans * ans) % mod; else return (((ans * ans) % mod) * x) % mod; } void solve(){ while(r--){ cin >> b >> q; num[b] = q; } int l = 0; r = n + 1; while(r - l > 0){ int mid = l + r >> 1, ans = 0, answer = 0; memset(dem, 0, sizeof(dem)); memset(flag, 0, sizeof(flag)); int cnt = 0; // cout << mid << "\n"; for(int i = 1; i <= n; i++){ dem[a[i]]++; if(dem[a[i]] >= num[a[i]]){ if(!flag[a[i]]) flag[a[i]] = 1, ans++; } if(i > mid){ if(dem[a[i - mid]] == num[a[i - mid]]){ if(flag[a[i - mid]]) flag[a[i - mid]] = 0, ans--; } dem[a[i - mid]]--; } answer = max(answer, ans); // cout << ans <<" "; } // cout << "\n"; if(answer < k) l = mid + 1; else r = mid; } if(r == n + 1) cout << "impossible"; else cout << r; } signed main(){ ios_base::sync_with_stdio(NULL); cin.tie(nullptr); cout.tie(nullptr); rng.seed((int)main ^ time(0)); #ifdef Kawaii auto starttime = chrono::high_resolution_clock::now(); #endif cin >> n >> k >> r; for(int i = 1; i <= n; i++) cin >> a[i]; solve(); #ifdef Kawaii auto endtime = chrono::high_resolution_clock::now(); auto duration = chrono::duration_cast<chrono::milliseconds>(endtime - starttime).count(); cout << "\n=====" << "\nUsed: " << duration << " ms\n"; #endif }

Compilation message (stderr)

dna.cpp: In function 'void solve()':
dna.cpp:25:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   25 |         int mid = l + r >> 1, ans = 0, answer = 0;
      |                   ~~^~~
dna.cpp:28:13: warning: unused variable 'cnt' [-Wunused-variable]
   28 |         int cnt = 0;
      |             ^~~
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