Код:
#include <fstream>#include <vector>#include <numeric>int main() { std::ifstream cin("input.txt"); std::ofstream cout("output.txt"); int N, K; cin >> N >> K; std::vector<int> buffer(N); for (int i = 0; i < K; ++i) { for (int j = 0; j < N; ++j) { cin >> buffer[j]; } // Зануляем найденные min и max *(std::min_element(buffer.begin(), buffer.end())) = 0; *(std::max_element(buffer.begin(), buffer.end())) = 0; // Суммируем cout << std::accumulate(buffer.begin(), buffer.end(), 0) << "\n"; } return 0;}
x
2
+
y
2
=
16
...
...
...
...
...
...
.
.
(
1
)
x + y = 4 (2)
rearrange (2) to y = 4 - x (could do x = 4 - y )
substitute y = 4 - x into (1)
hence:
x
2
+
(
4
−
x
)
2
=
16
⇒
x
2
+
16
−
8
x
+
x
2
=
16
and
2
x
2
−
8
x
+
16
−
16
=
0
⇒
2
x
2
−
8
x
=
0
factor and solve : 2x(x - 4 ) = 0
⇒
x
=
0
,
x
=
4
substitute these values into y = 4 - x , to find corresponding values of y.
x = 0 : y = 4 - 0 = 4 → (0 , 4)
x = 4 : y = 4 - 4 = 0 → (4 , 0 )
These are the points of intersection with the line x +y = 4 and the circle
x
2
+
y
2
=
16
Answer link
Объяснение: