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Submission #547193

# Submission time Handle Problem Language Result Execution time Memory
547193 2022-04-09T19:06:36 Z Ahmed57 Lightning Rod (NOI18_lightningrod) C++14
100 / 100
 1720 ms 262144 KB 
#include<bits/stdc++.h>
using namespace std;
const int N = 1e7+9;
int per[N] , suf[N];
int aa[N], bb[N];
int main() {
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int n;cin>>n;
    for(int i = 0;i<n;i++){
        cin>>aa[i]>>bb[i];
        if(i==0){
            per[0] = aa[0]+bb[0];
        }else{
            per[i] = max(per[i-1],aa[i]+bb[i]);
        }
    }
    suf[n-1] = bb[n-1]-aa[n-1];
    for(int i = n-2;i>=0;i--){
        suf[i] = max(suf[i+1],bb[i]-aa[i]);
    }
    int ans = 0;
    for(int i = 0;i<n;i++){
        if(i==0){
            if(suf[i+1]<bb[i]-aa[i]){
                ans++;
            }
        }else if(i==n-1){
            if(per[i-1]<aa[i]+bb[i])ans++;
        }else{
            if(suf[i+1]<bb[i]-aa[i]&&per[i-1]<aa[i]+bb[i])ans++;
        }
    }
    cout<<ans<<"\n";
	return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1403 ms 152452 KB Output is correct
2 Correct 1393 ms 151816 KB Output is correct
3 Correct 1394 ms 147776 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #4
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 380 KB Output is correct
13 Correct 1 ms 340 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 380 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 37 ms 3292 KB Output is correct
15 Correct 37 ms 3428 KB Output is correct
16 Correct 35 ms 3272 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1411 ms 156928 KB Output is correct
2 Correct 1355 ms 156340 KB Output is correct
3 Correct 1340 ms 152692 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1403 ms 152452 KB Output is correct
2 Correct 1393 ms 151816 KB Output is correct
3 Correct 1394 ms 147776 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 380 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 37 ms 3292 KB Output is correct
18 Correct 37 ms 3428 KB Output is correct
19 Correct 35 ms 3272 KB Output is correct
20 Correct 1411 ms 156928 KB Output is correct
21 Correct 1355 ms 156340 KB Output is correct
22 Correct 1340 ms 152692 KB Output is correct
23 Correct 1670 ms 142492 KB Output is correct
24 Correct 1705 ms 178928 KB Output is correct
25 Correct 1720 ms 262144 KB Output is correct