treap+io优化，很快: https://vijos.org/records/59065a11d3d8a12f121640b5

STL rope / Splay

#include <bits/stdc++.h>
#include <ext/rope>
inline int read() {
    register int x = 0, f = 1; char ch = getchar();
    while (!isdigit(ch)) { if (ch == '-') f = -1; ch = getchar(); }
    while (isdigit(ch)) { x = (x << 1) + (x << 3) + (ch ^ '0'); ch = getchar(); }
    return x * f;
}
int main() {
    __gnu_cxx::crope rope;
    int t, now;
    static char ch[3000005];
    t = read();
    char s[10]; int x;
    while (t--) {
        scanf("%s", s);
        switch (s[0]) {
        case 'M': now = read(); break;
        case 'P': now--; break;
        case 'N': now++; break;
        case 'I':
            x = read();
            for (int i = 0; i < x; i++) {
                ch[i] = getchar();
                while (ch[i] == '\n')ch[i] = getchar();
            }
            ch[x] = 0;
            rope.insert(now, ch);
            break;
        case 'D': x = read(); rope.erase(now, x); break;
        case 'G': x = read(); rope.copy(now, x, ch); ch[x] = 0; puts(ch);
        }
    }
    return 0;
}

cin会tle......

...No cin

占沙发

沙发