問題：B - 文字列の反転 #include <algorithm> #include <cstdio> #include <iostream> #include <string> using namespace std; #define REP(i, n) for(int i = 0 ; i < (n); ++i) int main(void) { string s; int n, a, b; cin >> s; scanf ("%d", &n); REP(i, n) { scanf ("%d %d", &a, &b); re</string></iostream></cstdio></algorithm>…