Объяснение:
1. var i: integer;
var z, s: double;
begin
i := 1;
z := 512;
s := 0;
while i <= 10 do
begin
s := s + i/z;
inc(i);
z := z/2;
end;
writeln(s:0:2);
end.
2. var i, k: integer;
begin
i := 0;
k := 0;
repeat
inc(i);
if ((i mod 2) = 0) then inc(k);
until i=5;
write(k);
end.
3. var i, n: integer;
begin
i := 0;
n := 0;
while i<10 do
begin
n := random (31) + 10;
if ((n mod 2) = 0) then
begin
writeln(n);
inc(i);
end;
end;
end.
#include <iostream>
#include <stack>
using namespace std;
void solve(string &s){
stack<char> cur;
for(int i = 0; i < s.size(); i++){
if(!cur.empty() && ((cur.top() == '(' && s[i] == ')') || (cur.top() == '{' && s[i] == '}') || (cur.top() == '[' && s[i] == ']')))
cur.pop();
else cur.push(s[i]);
}
if(cur.empty()) cout << "YES";
else cout << "NO";
}
signed main() {
string str;
cin >> str;
solve(str);
}