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Submission #311001

# Submission time Handle Problem Language Result Execution time Memory
311001 2020-10-09T03:06:09 Z urd05 Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 164 ms 10216 KB 
#include <bits/stdc++.h>
using namespace std;

long long h[100000];
long long w[100000];
long long pos[100000];
typedef pair<int,int> P;
priority_queue<P,vector<P>,greater<P>> pq;
const int mod=1e9+7;
long long inv2=5e8+4;

int main(void) {
    int n;
    scanf("%d",&n);
    for(int i=0;i<n;i++) {
        scanf("%lld",&h[i]);
        pq.push(P(h[i]+1,i));
    }
    set<long long> s;
    long long sum=0;
    for(int i=0;i<n;i++) {
        scanf("%lld",&w[i]);
        sum+=w[i];
        if (i) {
            pos[i]=pos[i-1]+w[i-1];
        }
    }
    s.insert(0);
    s.insert(sum);
    sum%=mod;
    long long pl=(sum*(sum+1));
    pl%=mod;
    pl*=inv2;
    pl%=mod;
    long long prev=0;
    long long ret=0;
    while (!pq.empty()) {
        long long save=pl;
        int now=pq.top().first;
        while (!pq.empty()&&pq.top().first==now) {
            long long p=pos[pq.top().second];
            long long d=*(--(s.upper_bound(p)));
            long long u=*s.lower_bound(p+w[pq.top().second]);
            long long len=(u-d)%mod;
            pl-=(((len*(len+1))%mod)*inv2)%mod;
            len=(p-d)%mod;
            pl+=(((len*(len+1))%mod)*inv2)%mod;
            len=(u-p-w[pq.top().second])%mod;
            pl+=(((len*(len+1))%mod)*inv2)%mod;
            pl%=mod;
            pl+=mod;
            pl%=mod;
            s.insert(p);
            s.insert(p+w[pq.top().second]);
            pq.pop();
        }
        long long len=now;
        ret+=(save*((((len*(len+mod-1))%mod)*inv2)%mod))%mod;
        len=prev;
        ret-=(save*((((len*(len+mod-1))%mod)*inv2)%mod))%mod;
        ret%=mod;
        ret+=mod;
        ret%=mod;
        prev=now;
    }
    printf("%lld",ret);
}

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
fancyfence.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |         scanf("%lld",&h[i]);
      |         ~~~~~^~~~~~~~~~~~~~
fancyfence.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   22 |         scanf("%lld",&w[i]);
      |         ~~~~~^~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 50 ms 4208 KB Output is correct
4 Correct 100 ms 8172 KB Output is correct
5 Correct 99 ms 8168 KB Output is correct
6 Correct 88 ms 8172 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 512 KB Output is correct
2 Correct 9 ms 1152 KB Output is correct
3 Correct 49 ms 4208 KB Output is correct
4 Correct 105 ms 8168 KB Output is correct
5 Correct 103 ms 8172 KB Output is correct
6 Correct 1 ms 384 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 10 ms 1280 KB Output is correct
4 Correct 50 ms 5232 KB Output is correct
5 Correct 104 ms 10116 KB Output is correct
6 Correct 104 ms 10216 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 9 ms 1280 KB Output is correct
9 Correct 49 ms 5232 KB Output is correct
10 Correct 104 ms 9992 KB Output is correct
11 Correct 104 ms 10088 KB Output is correct
12 Correct 1 ms 384 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 0 ms 384 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 380 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 47 ms 4844 KB Output is correct
12 Correct 102 ms 9324 KB Output is correct
13 Correct 100 ms 9448 KB Output is correct
14 Correct 88 ms 9372 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 9 ms 1280 KB Output is correct
17 Correct 50 ms 5228 KB Output is correct
18 Correct 103 ms 10088 KB Output is correct
19 Correct 102 ms 10216 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 9 ms 1280 KB Output is correct
22 Correct 49 ms 5232 KB Output is correct
23 Correct 103 ms 9960 KB Output is correct
24 Correct 103 ms 10088 KB Output is correct
25 Correct 1 ms 512 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 2 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 2 ms 384 KB Output is correct
30 Correct 12 ms 1408 KB Output is correct
31 Correct 12 ms 1280 KB Output is correct
32 Correct 64 ms 5156 KB Output is correct
33 Correct 67 ms 5232 KB Output is correct
34 Correct 164 ms 9832 KB Output is correct
35 Correct 134 ms 9992 KB Output is correct
36 Correct 163 ms 10092 KB Output is correct
37 Correct 162 ms 10088 KB Output is correct
38 Correct 1 ms 384 KB Output is correct
39 Correct 146 ms 10108 KB Output is correct
40 Correct 124 ms 10092 KB Output is correct
41 Correct 102 ms 10092 KB Output is correct
42 Correct 107 ms 10168 KB Output is correct