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Submission #288645

# Submission time Handle Problem Language Result Execution time Memory
288645 2020-09-01T17:40:01 Z alexandra_udristoiu Necklace (Subtask 1-3) (BOI19_necklace1) C++14
85 / 85
 223 ms 71160 KB 
#include<iostream>
#include<cstring>
using namespace std;
int n, m, i, j, sol, x, ii, jj, val;
int d[3005][3005], ds[3005][3005];
char a[3005], b[3005];
void solve(int t){
    for(i = n; i >= 1; i--){
        for(j = m; j >= 1; j--){
            if(a[i] == b[j]){
                d[i][j] = 1 + d[i + 1][j + 1];
                x = i + d[i][j] - 1;
                ds[x][j] = max(ds[x][j], d[i][j]);
            }
        }
    }
    for(i = 1; i <= n; i++){
        for(j = 1; j <= m; j++){
            val = d[i][j] + ds[i - 1][ j + d[i][j] ];
            if(val > sol){
                sol = val;
                if(t == 0){
                    jj = j;
                }
                else{
                    jj = j + val - 1;
                    jj = m - jj + 1;
                }
                ii = i - ds[i - 1][ j + d[i][j] ];
            }
            sol = max(sol, d[i][j] + ds[i - 1][ j + d[i][j] ]);
        }
    }
}
int main(){
    cin>> a + 1;
    n = strlen(a + 1);
    cin>> b + 1;
    m = strlen(b + 1);
    solve(0);
    memset(d, 0, sizeof(d) );
    memset(ds, 0, sizeof(ds) );
    for(i = 1, j = m; i < j; i++, j--){
        swap(b[i], b[j]);
    }
    solve(1);
    cout<< sol <<"\n";
    cout<< ii - 1 <<" "<< jj - 1 <<"\n";
}

Compilation message

necklace.cpp: In function 'int main()':
necklace.cpp:36:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   36 |     cin>> a + 1;
      |           ~~^~~
necklace.cpp:38:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   38 |     cin>> b + 1;
      |           ~~^~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 71032 KB Output is correct
2 Correct 41 ms 71032 KB Output is correct
3 Correct 40 ms 71032 KB Output is correct
4 Correct 40 ms 71032 KB Output is correct
5 Correct 47 ms 71032 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 71032 KB Output is correct
2 Correct 41 ms 71032 KB Output is correct
3 Correct 40 ms 71032 KB Output is correct
4 Correct 40 ms 71032 KB Output is correct
5 Correct 47 ms 71032 KB Output is correct
6 Correct 42 ms 71032 KB Output is correct
7 Correct 40 ms 71036 KB Output is correct
8 Correct 43 ms 71032 KB Output is correct
9 Correct 47 ms 71032 KB Output is correct
10 Correct 42 ms 71040 KB Output is correct
11 Correct 41 ms 71032 KB Output is correct
12 Correct 42 ms 71032 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 71032 KB Output is correct
2 Correct 41 ms 71032 KB Output is correct
3 Correct 40 ms 71032 KB Output is correct
4 Correct 40 ms 71032 KB Output is correct
5 Correct 47 ms 71032 KB Output is correct
6 Correct 42 ms 71032 KB Output is correct
7 Correct 40 ms 71036 KB Output is correct
8 Correct 43 ms 71032 KB Output is correct
9 Correct 47 ms 71032 KB Output is correct
10 Correct 42 ms 71040 KB Output is correct
11 Correct 41 ms 71032 KB Output is correct
12 Correct 42 ms 71032 KB Output is correct
13 Correct 203 ms 71036 KB Output is correct
14 Correct 147 ms 71064 KB Output is correct
15 Correct 223 ms 71060 KB Output is correct
16 Correct 157 ms 71160 KB Output is correct
17 Correct 121 ms 71032 KB Output is correct
18 Correct 123 ms 71032 KB Output is correct
19 Correct 157 ms 71032 KB Output is correct
20 Correct 183 ms 71160 KB Output is correct
21 Correct 213 ms 71056 KB Output is correct