Submission #35576

#	Time	Username	Problem	Language	Result	Execution time	Memory
35576		imaxblue	Match (CEOI16_match)	C++14	100 / 100	46 ms	7968 KiB

match

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define pii pair<int, int>
#define p3i pair<pii, int>
#define pll pair<ll, ll>
#define p3l pair<pll, ll>
#define lseg L, (L+R)/2, N*2+1
#define rseg (L+R)/2+1, R, N*2+2
#define ub upper_bound
#define lb lower_bound
#define pq priority_queue
#define MN 1000000007
#define fox(k, x) for (int k=0; k<x; ++k)
#define fox1(k, x) for (int k=1; k<=x; ++k)
#define foxr(k, x) for (int k=x-1; k>=0; --k)
#define fox1r(k, x) for (int k=x; k>0; --k)
#define ms multiset
#define flood(x) memset(x, 0x3f3f3f3f, sizeof x)
#define drain(x) memset(x, 0, sizeof x)
#define rng() (rand() >> 3)*rand()

int n, r[100005], len[100005];
string s;
char ans[100005];
bool U[100005];
set<int> u, pos[30];
int solve(int P){
    if (U[P]) return len[P];
    U[P]=1;
    int k=P-1;
    //cout << "%" << P << endl;
    while(k>=0 && s[k]!=s[P]){
        k=solve(k)-1;
        //cout << P << endl;
        //if (P<=941) cout << P << ' ' << k << endl;
    }
    len[P]=max(-1, k);
    //cout << "*" << P << ' ' << len[P] << ' ';
    return len[P];
}
bool dfs(int L, int R){
    //cout << L << ' ' << R << endl;
    if (L>R) return 1;
    if (s[L]==s[R]){
        ans[L]='(';
        ans[R]=')';
        return dfs(L+1, R-1);
    }
    int p=R;
    while(p>L && s[p]!=s[L]){
        p=solve(p)-1;
        //cout << p << endl;
    }
    //cout << "^";
    if (p>L){
        return (dfs(L, p) && dfs(p+1, R));
    }
    return 0;
}
int main(){
    cin >> s; n=s.size();
    fox(l, s.size()){
        pos[s[l]-'a'].insert(l);
    }

    if (dfs(0, n-1)==0) cout << -1;
    else {
        fox(l, n) cout << ans[l];
    }
    //fox(l, n) cout << len[l] << ' '; cout << endl;
    return 0;
}

Compilation message (stderr)

match.cpp: In function 'int main()':
match.cpp:18:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define fox(k, x) for (int k=0; k<x; ++k)
                                  ^
match.cpp:67:5: note: in expansion of macro 'fox'
     fox(l, s.size()){
     ^

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