Submission #116649

#	Time	Username	Problem	Language	Result	Execution time	Memory
116649		JohnTitor	Match (CEOI16_match)	C++11	100 / 100	17 ms	11164 KiB

match

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, j, k) for(int i=(j); i<=(k); i++)
#define FFOR(i, j, k) for(int i=(j); i<(k); i++)
#define DFOR(i, j, k) for(int i=(j); i>=(k); i--)
#define bug(x) cerr<<#x<<" = "<<(x)<<'\n'
#define pb push_back
#define mp make_pair
#define bit(s, i) (((s)>>(i))&1LL)
#define mask(i) ((1LL<<(i)))
#define builtin_popcount __builtin_popcountll
#define __builtin_popcount __builtin_popcountll
using ll=long long; using ld=long double;
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); const ld pi=acos(0)*2;
template <typename T> inline void read(T &x){char c; bool nega=0; while((!isdigit(c=getchar()))&&(c!='-')); if(c=='-'){nega=1; c=getchar();} x=c-48; while(isdigit(c=getchar())) x=x*10+c-48; if(nega) x=-x;}
template <typename T> inline void writep(T x){if(x>9) writep(x/10); putchar(x%10+48);}
template <typename T> inline void write(T x){if(x<0){ putchar('-'); x=-x;} writep(x);}
template <typename T> inline void writeln(T x){write(x); putchar('\n');}
#define taskname "Match"
string s;
int cnt[256];
string t;
vector <char> v;
int f[100000][26];
void kill(){
    puts("-1");
    exit(0);
}
void make(int l, int r){
    if(l>r) return;
    if((r-l+1)%2) kill();
//    cerr<<l<<' '<<r<<'\n';
    t[l]='(';
    t[r]=')';
    if(s[l]==s[r]){
        make(l+1, r-1);
    }
    else{
        if(f[r][s[l]]<=l) kill();
        make(l, f[r][s[l]]);
        make(f[r][s[l]]+1, r);
    }
}
int main(){
    #ifdef Aria
        if(fopen(taskname".in", "r"))
            freopen(taskname".in", "r", stdin);
    #endif // Aria
    cin>>s;
    for(char &c: s) c-='a';
    for(char c: s) cnt[c]++;
    FFOR(c, 0, 26) if(cnt[c]%2){
        puts("-1");
        return 0;
    }
    FFOR(i, 0, 26) f[0][i]=-1;
    FFOR(i, 0, 26) f[1][i]=-1;
    FFOR(i, 2, s.size()){
        if(s[i]==s[i-1]){
            FFOR(j, 0, 26) f[i][j]=f[i-2][j];
            f[i][s[i-2]]=i-2;
        }
        else if(f[i-1][s[i]]>0){
            ///match f[i-1][s[i]] to i
            FFOR(j, 0, 26) f[i][j]=f[f[i-1][s[i]]-1][j];
            f[i][s[f[i-1][s[i]]-1]]=f[i-1][s[i]]-1;
        }
        else FFOR(j, 0, 26) f[i][j]=-1;
//        FFOR(j, 0, 26) cerr<<f[i][j]<<" \n"[j+1==26];
    }
    t=s;
    make(0, s.size()-1);
    cout<<t<<'\n';
}

Compilation message (stderr)

match.cpp: In function 'void make(int, int)':
match.cpp:39:21: warning: array subscript has type 'char' [-Wchar-subscripts]
         if(f[r][s[l]]<=l) kill();
                     ^
match.cpp:40:26: warning: array subscript has type 'char' [-Wchar-subscripts]
         make(l, f[r][s[l]]);
                          ^
match.cpp:41:23: warning: array subscript has type 'char' [-Wchar-subscripts]
         make(f[r][s[l]]+1, r);
                       ^
match.cpp: In function 'int main()':
match.cpp:51:25: warning: array subscript has type 'char' [-Wchar-subscripts]
     for(char c: s) cnt[c]++;
                         ^
match.cpp:4:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define FFOR(i, j, k) for(int i=(j); i<(k); i++)
                                       ^
match.cpp:58:5: note: in expansion of macro 'FFOR'
     FFOR(i, 2, s.size()){
     ^~~~
match.cpp:61:24: warning: array subscript has type 'char' [-Wchar-subscripts]
             f[i][s[i-2]]=i-2;
                        ^
match.cpp:63:28: warning: array subscript has type 'char' [-Wchar-subscripts]
         else if(f[i-1][s[i]]>0){
                            ^
match.cpp:65:49: warning: array subscript has type 'char' [-Wchar-subscripts]
             FFOR(j, 0, 26) f[i][j]=f[f[i-1][s[i]]-1][j];
                                                 ^
match.cpp:66:31: warning: array subscript has type 'char' [-Wchar-subscripts]
             f[i][s[f[i-1][s[i]]-1]]=f[i-1][s[i]]-1;
                               ^
match.cpp:66:35: warning: array subscript has type 'char' [-Wchar-subscripts]
             f[i][s[f[i-1][s[i]]-1]]=f[i-1][s[i]]-1;
                                   ^
match.cpp:66:48: warning: array subscript has type 'char' [-Wchar-subscripts]
             f[i][s[f[i-1][s[i]]-1]]=f[i-1][s[i]]-1;
                                                ^

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