Submission #776069

#	Time	Username	Problem	Language	Result	Execution time	Memory
776069		peteza	Ancient Books (IOI17_books)	C++14	0 / 100	0 ms	212 KiB

books

#include <bits/stdc++.h>
#include "books.h"
using namespace std;

int qs[1000005];
int lnz = -1, rnz = -1;
long long minimum_walk(std::vector<int> p, int s) {
    int cur = 0, cv = 0, curcnt = 0;
    long long cans = 0;
    for(int i=0;i<=p.size();i++) qs[i] = 0;
    for(int i=0;i<p.size();i++) {
        qs[min(i, p[i])]++; qs[max(i, p[i])]--;
    }
    for(int i=0;i<p.size();i++) {
        cv += qs[i];
        cans += cv;
        if(!cv) {
            lnz = (lnz == -1 ? i : lnz);
            rnz = i;
        }
    }

    cv = 0;
    for(int i=0;i<p.size();i++) {
        cv += qs[i];
        cur += (!cv && lnz <= i && i <= rnz);
    }
	return cans + 2*cur;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<=p.size();i++) qs[i] = 0;
      |                 ~^~~~~~~~~~
books.cpp:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for(int i=0;i<p.size();i++) {
      |                 ~^~~~~~~~~
books.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i=0;i<p.size();i++) {
      |                 ~^~~~~~~~~
books.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int i=0;i<p.size();i++) {
      |                 ~^~~~~~~~~
books.cpp:8:26: warning: unused variable 'curcnt' [-Wunused-variable]
    8 |     int cur = 0, cv = 0, curcnt = 0;
      |                          ^~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30