Submission #1178723

#	Time	Username	Problem	Language	Result	Execution time	Memory
1178723		vominhhuy123	Matching (CEOI11_mat)	C++20	Compilation error	0 ms	0 KiB

mat

#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
 

typedef unsigned long long ull;
 

const ull OFFSET = 1469598103934665603ULL;
const ull PRIME  = 1099511628211ULL;
 
struct SegTree {
    int n;
    vector<int> tree; 
    const vector<int>& arr;
 
    SegTree(const vector<int>& a) : arr(a) {
        n = a.size();
        tree.resize(4*n);
        build(1, 0, n-1);
    }
 
    void build(int idx, int l, int r) {
        if(l == r) {
            tree[idx] = l;
            return;
        }
        int mid = (l + r) >> 1;
        build(idx*2, l, mid);
        build(idx*2+1, mid+1, r);
        int leftIdx = tree[idx*2], rightIdx = tree[idx*2+1];
        tree[idx] = (arr[leftIdx] < arr[rightIdx] ? leftIdx : rightIdx);
    }
 

    int query(int idx, int l, int r, int ql, int qr) const {
        if(ql > r || qr < l)
            return -1;
        if(ql <= l && r <= qr)
            return tree[idx];
        int mid = (l + r) >> 1;
        int leftAns = query(idx*2, l, mid, ql, qr);
        int rightAns = query(idx*2+1, mid+1, r, ql, qr);
        if(leftAns == -1) return rightAns;
        if(rightAns == -1) return leftAns;
        return (arr[leftAns] < arr[rightAns] ? leftAns : rightAns);
    }
 
    int query(int ql, int qr) const {
        return query(1, 0, n-1, ql, qr);
    }
};
 
const ull EMPTY_HASH = 1234567ULL;
 
ull getHash(int L, int R, const vector<int>& a, const SegTree &seg) {
    if(L > R)
        return EMPTY_HASH;
    int pos = seg.query(L, R);
    ull leftH  = getHash(L, pos - 1, a, seg);
    ull rightH = getHash(pos + 1, R, a, seg);
    ull h = OFFSET;
    h ^= leftH;  h *= PRIME;
    h ^= 0x9e3779b97f4a7c15ULL; h *= PRIME;
    h ^= rightH; h *= PRIME;
    return h;
}
 

int main(){
    int n, m;
    if(scanf("%d %d", &n, &m) != 2)
        return 1;
    vector<int> logoInput(n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &logoInput[i]);
        // the input permutation is 1-indexed; here logoInput[i] is s[i+1]
    }
    vector<int> buildings(m);
    for (int i = 0; i < m; i++)
        scanf("%d", &buildings[i]);
SegTree segLogo(pattern);
    vector<int> pattern(n);
    for (int i = 0; i < n; i++) {
        int stripePos = logoInput[i] - 1;
        pattern[stripePos] = i + 1; // ranks from 1 to n
    }
 
    SegTree segBuildings(buildings);
 
	ull logoHash = getHash(0, n - 1, pattern, segLogo);
     vector<int> answer;
    for (int start = 0; start <= m - n; start++) {
       ull curHash = getHash(start, start + n - 1, buildings, segBuildings);
        if(curHash == logoHash)
            answer.push_back(start + 1); 
    }
 

    printf("%d\n", (int)answer.size());
    if(!answer.empty()){
        for (int i = 0; i < (int)answer.size(); i++) {
            if(i) printf(" ");
            printf("%d", answer[i]);
        }
        printf("\n");
    } else {
        printf("\n");
    }
 
    return 0;
}

Compilation message (stderr)

mat.cpp: In function 'int main()':
mat.cpp:83:17: error: 'pattern' was not declared in this scope
   83 | SegTree segLogo(pattern);
      |                 ^~~~~~~
mat.cpp:77:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         scanf("%d", &logoInput[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~
mat.cpp:82:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         scanf("%d", &buildings[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~