oj.uz

Submission #77440

# Submission time Handle Problem Language Result Execution time Memory
77440 2018-09-27T20:26:32 Z Vardanyan Watching (JOI13_watching) C++14
100 / 100
 880 ms 36216 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 3005;
int a[N];
int mxshort[N];
int mxlong[N];
int dp[N][N];
int main(){
    int n,p,q;
    scanf("%d%d%d",&n,&p,&q);
    for(int i = 1;i<=n;i++) scanf("%d",&a[i]);
    sort(a+1,a+1+n);
    int l = 1;
    int r = 1000*1000*1000;
    int ans = r;
    while(l<=r){
        int m = (l+r)/2;
        memset(mxlong,0,sizeof(mxlong));
        memset(mxshort,0,sizeof(mxshort));
        memset(dp,0,sizeof(dp));
        int now = n;
        int noww = n;
        for(int i = n;i>=1;i--){
            while(!(abs(a[i]-a[now])+1<=m)) now--;
            mxshort[i] = now;
            while(!(abs(a[i]-a[noww])+1<=2*m)) noww--;
            mxlong[i] = noww;
        }
        bool f = false;
        dp[0][0] = 1;
        int u = 5;
        for(int i = 0;i<=min(n,p);i++){
            for(int j = 0;j<=min(n,q);j++){
                int pos = max(1,dp[i][j]);
                dp[i+1][j] = max(dp[i+1][j],mxshort[pos]+1);
                dp[i][j+1] = max(dp[i][j+1],mxlong[pos]+1);
            }
        }

        for(int i = 0;i<=min(n,p);i++){
            for(int j = 0;j<=min(n,q);j++) if(dp[i][j]>n) f = true;
        }
        if(f){
            ans = m;
            r = m-1;
        }
        else l = m+1;
    }
    cout<<ans<<endl;
    return 0;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:31:13: warning: unused variable 'u' [-Wunused-variable]
         int u = 5;
             ^
watching.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&n,&p,&q);
     ~~~~~^~~~~~~~~~~~~~~~~~~
watching.cpp:11:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1;i<=n;i++) scanf("%d",&a[i]);
                             ~~~~~^~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 185 ms 35704 KB Output is correct
2 Correct 196 ms 35768 KB Output is correct
3 Correct 179 ms 35768 KB Output is correct
4 Correct 200 ms 35912 KB Output is correct
5 Correct 193 ms 35912 KB Output is correct
6 Correct 202 ms 35912 KB Output is correct
7 Correct 212 ms 35912 KB Output is correct
8 Correct 202 ms 35912 KB Output is correct
9 Correct 218 ms 35912 KB Output is correct
10 Correct 207 ms 35912 KB Output is correct
11 Correct 201 ms 35972 KB Output is correct
12 Correct 173 ms 35972 KB Output is correct
13 Correct 197 ms 35972 KB Output is correct
14 Correct 181 ms 35972 KB Output is correct
15 Correct 167 ms 35972 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 176 ms 35972 KB Output is correct
2 Correct 179 ms 35972 KB Output is correct
3 Correct 582 ms 35972 KB Output is correct
4 Correct 249 ms 35972 KB Output is correct
5 Correct 213 ms 36064 KB Output is correct
6 Correct 880 ms 36064 KB Output is correct
7 Correct 205 ms 36064 KB Output is correct
8 Correct 220 ms 36064 KB Output is correct
9 Correct 214 ms 36064 KB Output is correct
10 Correct 241 ms 36080 KB Output is correct
11 Correct 223 ms 36080 KB Output is correct
12 Correct 385 ms 36136 KB Output is correct
13 Correct 186 ms 36216 KB Output is correct
14 Correct 192 ms 36216 KB Output is correct
15 Correct 190 ms 36216 KB Output is correct