Submission #776082

#	Time	Username	Problem	Language	Result	Execution time	Memory
776082		peteza	Ancient Books (IOI17_books)	C++14	50 / 100	93 ms	15912 KiB

books

#include <bits/stdc++.h>
#include "books.h"
using namespace std;
 
int qs[1000005], cval[1000005];
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;
        cval[i] = cv;
        if(!cv) cur++;
    }
    int corner = 0;
    for(int i=0;i<min((int)p.size(), s);i++) {
        if(cval[i] != 0) break;
        corner++;
    }
    for(int i=p.size()-1;i>=s;i--) {
        if(cval[i] != 0) break;
        corner++;
    }
	return cans + 2*(cur-corner);
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:9:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for(int i=0;i<=p.size();i++) qs[i] = 0;
      |                 ~^~~~~~~~~~
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++) {
      |                 ~^~~~~~~~~
books.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(int i=0;i<p.size();i++) {
      |                 ~^~~~~~~~~
books.cpp:7:26: warning: unused variable 'curcnt' [-Wunused-variable]
    7 |     int cur = 0, cv = 0, curcnt = 0;
      |                          ^~~~~~

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