1#include <bits/stdc++.h>
2using namespace std;
3
4int main() {
5        int a, b, c;
6        cin >> a >> b >> c;
7        if (a + b > c) {
8                cout << "yes" << endl;
9        } else {
10                cout << "no" << endl;
11        }
12        return 0;
13}

1#include <bits/stdc++.h>
2using namespace std;
3
4int main() {
5        int a, b, c;
6        cin >> a >> b >> c;
7        if (a + b > c && a + c > b && b + c > a) {
8                cout << "Yes" << endl;
9        } else {
10                cout << "No" << endl;
11        }
12
13        return 0;
14}

1#include <bits/stdc++.h>
2using namespace std;
3
4int main() {
5        int n;
6        cin >> n;
7        if (0 == n % 2) {
8                cout << "2" << endl;
9        }
10        if (0 == n % 3) {
11                cout << 3 << endl;
12        }
13        if (0 == n % 5) {
14                cout << 5 << endl;
15        }
16        if (0 == n % 7) {
17                cout << 7 << endl;
18        }
19        return 0;
20}

if (布尔表达式) {
    操作1
} else {
    操作2
}

1int number = 10;
2if (number > 0) {
3    cout << "Number is positive." << endl;
4} else {
5    cout << "Number is not positive." << endl;
6}