Submission #175821

#	Time	Username	Problem	Language	Result	Execution time	Memory
175821		Ruxandra985	Match (CEOI16_match)	C++14	37 / 100	2040 ms	8696 KiB

match

/// oare cat de bine merge in practica?
#include <bits/stdc++.h>
#pragma GCC optimize "Ofast"
using namespace std;
int sp[30][100010];
int match_left[100010] , match_right[100010] , fl[30] , fr[30];
char sol[100010] , s[100010];
int ok;
int stk_l[100010] , stk_r[100010];
void match (int st , int dr){
    int i , elem_l = 0 , elem_r = 0 , poz;
    /// build match_left si match_right
    /// match_left[i] = match (st ... i)
    /// match_right[i] = match (i ... dr)
    match_left[st - 1] = match_right[dr + 1] = 1;
    for (i = 0 ; i < dr - st + 1 ; i++){

        poz = i + st; /// calc match_left[poz]
        if (stk_l[elem_l] == s[poz])
            elem_l--;
        else stk_l[++elem_l] = s[poz];
        if (!elem_l)
            match_left[poz] = 1;
        else match_left[poz] = 0;

        poz = dr - i; /// calc match_right[poz]
        if (stk_r[elem_r] == s[poz])
            elem_r--;
        else stk_r[++elem_r] = s[poz];
        if (!elem_r)
            match_right[poz] = 1;
        else match_right[poz] = 0;
    }

}
void solve (int st , int dr){
    int i;
    if (st > dr)
        return;
    if (!ok) /// nu mai are rost
        return;
    /// stii ca pe st pui ( , gaseste i match ul
    match(st + 1 , dr);
    for (i = ( ( (dr & 1) != (st & 1) ) ? dr : dr - 1); i >= st + 1 ; i-=2){
        if (match_left[i - 1] && match_right[i + 1])
            break;
    }
    if (i < st + 1){
        ok = 0;
        return;
    }
    else {
        sol[st] = '(';
        sol[i] = ')';
        solve(st + 1 , i - 1);
        solve (i + 1 , dr);
    }
}
int main()
{
    FILE *fin = stdin;
    FILE *fout = stdout;
    int n , i;
    fgets (s+1 , 100010 , fin);

    n = 0;
    while ( 'a' <= s[n+1] && s[n+1] <= 'z' ){
        n++;
        s[n]-='a';

        for (i=0;i<='z'-'a';++i){
            sp[i][n] = sp[i][n-1] + (s[n] == i);
        }
    }
    stk_l[0] = stk_r[0] = -1;
    ok = 1;
    solve (1 , n);
    if (ok == 0){
        fprintf (fout,"%d\n",-1);
    }
    else {
        fputs (sol+1,fout);
    }
    return 0;
}

Compilation message (stderr)

match.cpp: In function 'int main()':
match.cpp:64:11: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     fgets (s+1 , 100010 , fin);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/stdio.h:936:0,
                 from /usr/include/c++/7/cstdio:42,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:46,
                 from match.cpp:2:
In function 'char* fgets(char*, int, FILE*)',
    inlined from 'int main()' at match.cpp:64:11:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:261:58: warning: call to '__fgets_chk_warn' declared with attribute warning: fgets called with bigger size than length of destination buffer
  return __fgets_chk_warn (__s, __bos (__s), __n, __stream);
                                                          ^

• Subtask 1: 10 / 10
• Subtask 2: 27 / 27
• Subtask 3: 0 / 63