問題：A - Two Coins #include <iostream> using namespace std; int main(void) { int a, b, c; cin.tie(0); ios::sync_with_stdio(false); cin >> a >> b >> c; cout << ((a + b) >= c? "Yes" : "No") << "\n"; return 0; }</iostream>

問題：B - Palindromic Numbers #include <iostream> using namespace std; #define FOR(i, a, b) for (int i = (a); i < (b); ++i) int main(void) { int a, b, ans = 0; cin >> a >> b; FOR(i, a, b + 1) { if ((i / 10000) % 10 == i % 10 && (i / 1000) % 10 == (i</iostream>…

問題：A - Diagonal String #include <iostream> using namespace std; #define REP(i, n) for (int i = 0; i < (n); ++i) int main(void) { string c, ans = ""; cin.tie(0); ios::sync_with_stdio(false); REP(i, 3) { cin >> c; ans += c[i]; } cout << ans << "\n"</iostream>…