Submission #225707

#	Time	Username	Problem	Language	Result	Execution time	Memory
225707		Ruxandra985	Rope (JOI17_rope)	C++14	45 / 100	2587 ms	2688 KiB

rope

#include <bits/stdc++.h>

using namespace std;
int v[1000010] , dp[1000010][2][2] , sol[1000010];
int main()
{
    FILE *fin = stdin;
    FILE *fout = stdout;
    int n , m , i , j , k , difj , difk , x;
    fscanf (fin,"%d%d",&n,&m);
    for (i = 1 ; i <= n ; i++){
        fscanf (fin,"%d",&v[i]);
    }

    for (i = 1 ; i <= m ; i++)
        sol[i] = 2000000000 * (m != 1);

    for (j = 1 ; j <= m ; j++){
        for (k = 1 ; k <= m ; k++){
            if (j == k)
                continue;

            /// pui culoarea j sau k peste tot
            /// forma generala :
            /// orice , par , par , ... , par , orice

            /// dp[i][tip_cul][0 / 1] = cmin pana la i, ai culoarea aia, len % 2 = 0 / 1

            dp[1][0][1] = (v[1] != j);
            dp[1][1][1] = (v[1] != k);

            dp[1][0][0] = dp[1][1][0] = 2000000000;

            difj = (v[1] != j);
            difk = (v[1] != k);

            for (i = 2 ; i <= n ; i++){

                dp[i][0][1] = min( dp[i - 1][0][0] , min( difk , dp[i - 1][1][0] ) ) + (v[i] != j);
                dp[i][1][1] = min( dp[i - 1][1][0] , min( difj , dp[i - 1][0][0] ) ) + (v[i] != k);

                dp[i][0][0] = dp[i - 1][0][1] + (v[i] != j);
                dp[i][1][0] = dp[i - 1][1][1] + (v[i] != k);

                difj += (v[i] != j);
                difk += (v[i] != k);


            }
            x = min(  min( dp[n][0][1] , dp[n][1][1] ) , min( dp[n][0][0] , dp[n][1][0] )    );
            sol[j] = min(sol[j] , x);
            sol[k] = min(sol[k] , x);


        }
    }

    for (i = 1 ; i <= m ; i++)
        fprintf (fout,"%d\n",sol[i]);

    return 0;
}

Compilation message (stderr)

rope.cpp: In function 'int main()':
rope.cpp:10:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf (fin,"%d%d",&n,&m);
     ~~~~~~~^~~~~~~~~~~~~~~~~~
rope.cpp:12:16: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         fscanf (fin,"%d",&v[i]);
         ~~~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 30 / 30
• Subtask 3: 0 / 10
• Subtask 4: 0 / 25
• Subtask 5: 0 / 20