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#include <bits/stdc++.h>
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using namespace std;
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int w[5]; // 分解数组
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bool check(string addr) {
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memset(w, -1, sizeof w);
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sscanf(addr.c_str(), "%d.%d.%d.%d:%d", &w[0], &w[1], &w[2], &w[3], &w[4]); // ① 按指定格式扫入变量
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// 干掉胡乱输入的,比如 33.3423.23423ASFDSDF.sdfsdf
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char str[100];
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sprintf(str, "%d.%d.%d.%d:%d", w[0], w[1], w[2], w[3], w[4]); // ② 将变量还原拼接成字符串
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if (str != addr) return false; // 字符数组可以直接与string对比!
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for (int i = 0; i < 5; i++) {
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if (w[i] < 0) return false;
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if (i < 4 && w[i] > 255) return false;
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if (i == 4 && w[i] > 65535) return false;
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}
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return true;
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}
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int main() {
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int n;
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cin >> n;
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unordered_map<string, int> hash;
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for (int i = 1; i <= n; i++) {
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string type, addr;
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cin >> type >> addr;
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if (type == "Server") {
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if (!check(addr))
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puts("ERR");
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else if (hash.count(addr))
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puts("FAIL");
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else {
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hash[addr] = i;
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puts("OK");
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}
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} else {
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if (!check(addr))
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puts("ERR");
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else if (!hash.count(addr))
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puts("FAIL");
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else
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cout << hash[addr] << endl;
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}
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}
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return 0;
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}
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