Submission #79049

#	Time	Username	Problem	Language	Result	Execution time	Memory
79049		TAMREF	Crayfish scrivener (IOI12_scrivener)	C++11	5 / 100	3 ms	1460 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
const int mx = 1e3 + 5;
const int lg = 20;

struct node{
    node(){}
    node(node *c, char x, int i) : c(c),x(x),i(i) {}
    node *p[lg], *c;
    char x;
    int i;
    void show(){
        printf("x = %c, i = %d, c = %p\n",x,i,c);
    }
};
vector<node> N;
int n;

void Init() {
}

void TypeLetter(char L) {
    //printf("Type(%c)\n",L);
    printf("");
    N.emplace_back();
    //puts("f1");
    N[n] = node(nullptr, L, !n ? 0 : N[n-1].i + 1);
    //puts("f2");
    node &x = N[n];
    //puts("f3");
    x.p[0] = (!n ? nullptr : &N[n-1]);
    //puts("f4");
    for(int j = 1; j < lg; j++){
        printf("");
        if(x.p[j-1] != nullptr) x.p[j] = x.p[j-1] -> p[j-1];
        else break;
    }
    //puts("f5");
    x.c = &x;
    //N[n].show();
    ++n;
}

void UndoCommands(int U) {
    //printf("Undo(%d)\n",U);
    N.emplace_back();
    node p = N[n - 1 - U];
    N[n] = node(p.c, 'U', p.i);
    node &x = N[n];
    x.p[0] = &p;
    for(int j = 1; j < lg; j++){
        if(x.p[j-1]) x.p[j] = x.p[j-1] -> p[j-1];
    }
    //N[n].show();
    ++n;
}

char GetLetter(int P) {
    //printf("Get(%d)\n",P);
    node *b = &N[n-1];
    if(b->i < P) puts("BAAM!");
    for(int j = lg; j >= 0; j--){
        if(b->i == P) return b->c->x;
        if(b->p[j] && b->p[j]->i >= P) b = b->p[j];
    }
    //printf("bi : %d\n",b->i);
    //puts("asdf");
    return b->i == P ? b->c->x : b->p[0]->c->x;
}

Compilation message (stderr)

scrivener.cpp: In function 'void TypeLetter(char)':
scrivener.cpp:24:14: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
              ^
scrivener.cpp:34:18: warning: zero-length gnu_printf format string [-Wformat-zero-length]
         printf("");
                  ^

• Subtask 1: 5 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40