Submission #365290

#TimeUsernameProblemLanguageResultExecution timeMemory
365290Bill_00Watching (JOI13_watching)C++14
50 / 100
1093 ms15724 KiB
#include <bits/stdc++.h> using namespace std; int a[2001]; int dp[2001][100001]; int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n,p,q; cin >> n >> p >> q; for(int i=1;i<=n;i++){ cin >> a[i]; } sort(a+1,a+n+1); if(p>=n || q>=n || p+q>=n){ cout << 1; return 0; } int l=1,r=1000000000; while(l!=r){ for(int i=1;i<=p;i++){ dp[0][i]=0; } for(int i=1;i<=n;i++){ dp[i][0]=1e9; } int mid=l+r>>1; for(int i=1;i<=n;i++){ for(int j=1;j<=p;j++){ int b=a[i]-mid+1; int id=lower_bound((a+1),(a+n+1),b)-(a+1); b=a[i]-2*mid+1; int id1=lower_bound((a+1),(a+n+1),b)-(a+1); dp[i][j]=min(dp[id][j-1],dp[id1][j]+1); } } if(dp[n][p]>q){ l=mid+1; } else r=mid; } //cout << l << endl; int mid=l; for(int i=1;i<=p;i++){ dp[0][i]=0; } for(int i=1;i<=n;i++){ dp[i][0]=1e9; } for(int i=1;i<=n;i++){ for(int j=1;j<=p;j++){ int b=a[i]-mid+1; int id=lower_bound((a+1),(a+n+1),b)-(a+1); b=a[i]-2*mid+1; int id1=lower_bound((a+1),(a+n+1),b)-(a+1); dp[i][j]=min(dp[id][j-1],dp[id1][j]+1); //cout << dp[i][j] << ' ' << i << ' ' << j << endl; } } if(dp[n][p]>q){ l++; } cout << l; }

Compilation message (stderr)

watching.cpp: In function 'int main()':
watching.cpp:27:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   27 |   int mid=l+r>>1;
      |           ~^~
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