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a year ago
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#include <iostream> #include <string> using namespace std; int main() { string s, x; cin >> s; s += ' '; int y = 0, temp = 0, temp2 = 0, null=0; for (auto c : s) { if (c >= '0' && c <= '9') { if (c == '0' && null == 1) { cout << "NO"; return 0; } if (c=='0') { null++; } x += c; temp2++; } else if (c == '.' && temp < 3 && temp2 >= 1) { y = stoi(x); if (y < 0 || y>255) { cout << "NO"; return 0; } temp2 = 0; temp++; y = 0; null = 0; x.clear(); } else if (temp == 3 && c == ' ' && temp2 >= 1) { y = stoi(x); if (y >= 0 && y <= 255) { cout << "YES"; } else { cout << "NO"; return 0; } } else { cout << "NO"; return 0; } } return 0; }