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#include <iostream> #include <string> using namespace std; int main() { string inputString = "あなたのXは素晴らしいX"; cin>> inputString; // "X" を "Twitter" に置換 size_t found = inputString.find("X"); while (found != string::npos) { inputString.replace(found, 1, "Twitter"); found = inputString.find("X", found + 7); // 7 は "Twitter" の文字数です } cout << inputString << endl; return 0; }