oj.uz

Submission #848332

# Submission time Handle Problem Language Result Execution time Memory
848332 2023-09-12T06:51:46 Z lovrot Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 27 ms 3916 KB 
#include <cstdio> 
#include <stack> 
#include <vector> 

#define X first
#define Y second
#define pb push_back

using namespace std; 

typedef long long ll; 
typedef pair<int, int> pii; 

const int MOD = 1e9 + 7; 
const int N = 1e5 + 10;

inline int add(int a, int b) {
	return ((ll) a + b + MOD) % MOD; 
}

inline int mult(int a, int b) {
	return (ll) a * b % MOD; 
}

inline int frac(int a) {
	return ((ll) a * (a + 1) / 2) % MOD;
}

int n, H[N], W[N];
int sol, sum;
stack<pii> stog; 

int product(int h, int w) {
	return mult(w, frac(h)); 
} 

int calc(int h, int w) {
	return mult(frac(w), frac(h)); 
}

int _calc(int h, int w1, int w2) {
	return mult(mult(w1, w2), frac(h)); 
}

int main() {
	scanf("%d", &n);
	for(int i = 0; i < n; i++) scanf("%d", H + i);
	for(int i = 0; i < n; i++) scanf("%d", W + i);
	for(int i = 0; i < n; i++) {
		sol = add(sol, calc(H[i], W[i])); //printf("+= %d\n", calc(H[i], W[i]));
		int _w = 0; 
		while(!stog.empty() && stog.top().X >= H[i]) {
			int h = stog.top().X;
			int w = stog.top().Y;
			sum = add(sum, -product(h, w)); 
			_w = add(_w, w); 
			stog.pop(); 
		}
		sol = add(sol, mult(sum, W[i])); 
		sol = add(sol, _calc(H[i], _w, W[i])); 
		_w = add(W[i], _w);
		stog.push({H[i], _w}); 
		sum = add(sum, product(H[i], _w)); 
	}	
	printf("%d\n", sol);
	return 0;
}

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
fancyfence.cpp:47:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  for(int i = 0; i < n; i++) scanf("%d", H + i);
      |                             ~~~~~^~~~~~~~~~~~~
fancyfence.cpp:48:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  for(int i = 0; i < n; i++) scanf("%d", W + i);
      |                             ~~~~~^~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 544 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 1052 KB Output is correct
3 Correct 10 ms 1368 KB Output is correct
4 Correct 18 ms 2128 KB Output is correct
5 Correct 18 ms 2368 KB Output is correct
6 Correct 18 ms 2136 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 2 ms 600 KB Output is correct
3 Correct 10 ms 1628 KB Output is correct
4 Correct 23 ms 3420 KB Output is correct
5 Correct 21 ms 2984 KB Output is correct
6 Correct 0 ms 344 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 3 ms 600 KB Output is correct
4 Correct 11 ms 1624 KB Output is correct
5 Correct 21 ms 3132 KB Output is correct
6 Correct 25 ms 3408 KB Output is correct
7 Correct 0 ms 600 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 11 ms 2080 KB Output is correct
10 Correct 22 ms 3664 KB Output is correct
11 Correct 20 ms 3916 KB Output is correct
12 Correct 0 ms 344 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 796 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 9 ms 1368 KB Output is correct
12 Correct 18 ms 2136 KB Output is correct
13 Correct 18 ms 2128 KB Output is correct
14 Correct 18 ms 2136 KB Output is correct
15 Correct 1 ms 356 KB Output is correct
16 Correct 3 ms 600 KB Output is correct
17 Correct 11 ms 1624 KB Output is correct
18 Correct 21 ms 2904 KB Output is correct
19 Correct 21 ms 3156 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 3 ms 600 KB Output is correct
22 Correct 11 ms 1884 KB Output is correct
23 Correct 19 ms 3620 KB Output is correct
24 Correct 20 ms 3828 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 600 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 344 KB Output is correct
30 Correct 2 ms 600 KB Output is correct
31 Correct 2 ms 600 KB Output is correct
32 Correct 10 ms 1624 KB Output is correct
33 Correct 11 ms 1756 KB Output is correct
34 Correct 27 ms 3160 KB Output is correct
35 Correct 20 ms 2908 KB Output is correct
36 Correct 23 ms 2904 KB Output is correct
37 Correct 22 ms 2896 KB Output is correct
38 Correct 0 ms 344 KB Output is correct
39 Correct 21 ms 3152 KB Output is correct
40 Correct 21 ms 2896 KB Output is correct
41 Correct 20 ms 3156 KB Output is correct
42 Correct 21 ms 3288 KB Output is correct