Submission #4022653

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Source Code Expand

#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <vector>

using namespace std;

int main(int argc, char *argv[]) {
  // read inputs
  int N;
  vector<int> ps;
  scanf("%d", &N);
  for (int i = 0; i < N; i++) {
    int p;
    scanf("%d", &p);
    ps.push_back(p - 1);  // NOTE : modified input
  }

  // create reverse map from ps[i] -> i
  vector<int> rs(N, 0);
  for (int i = 0; i < N; i++) {
    rs[ps[i]] = i;
  }

  // find longest sub-sequence of the form
  //     b, b + 1, ..., e - 2, e - 1
  vector<int> ls(N, 0);
  int max_l = 1;
  ls[N - 1] = 1;
  for (int i = N - 2; i >= 0; i--) {
    if (rs[i] < rs[i + 1]) {
      ls[i] = ls[i + 1] + 1;
    } else {
      ls[i] = 1;
    }
    max_l = max(max_l, ls[i]);
  }
  printf("%d\n", N - max_l);

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main(int, char**)’:
./Main.cpp:12:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &N);
                  ^
./Main.cpp:15:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &p);
                    ^

Judge Result