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Submission #412757

# Submission time Handle Problem Language Result Execution time Memory
412757 2021-05-27T13:02:50 Z 반딧불(#7608) Bread First Search (CCO21_day2problem2) C++17
25 / 25
 233 ms 5992 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

struct segTree{
    int tree[800002], lazy[800002];

    void propagate(int i, int l, int r){
        tree[i] += lazy[i];
        if(l != r){
            lazy[i*2] += lazy[i];
            lazy[i*2+1] += lazy[i];
        }
        lazy[i] = 0;
    }

    void update(int i, int l, int r, int s, int e, int val){
        propagate(i, l, r);
        if(r<s || e<l) return;
        if(s<=l && r<=e){
            lazy[i] += val;
            propagate(i, l, r);
            return;
        }
        int m = (l+r)>>1;
        update(i*2, l, m, s, e, val);
        update(i*2+1, m+1, r, s, e, val);
        tree[i] = min(tree[i*2], tree[i*2+1]);
    }

    int getRange(int i, int l, int r, int s, int e){
        propagate(i, l, r);
        if(r<s || e<l) return 1e9;
        if(s<=l && r<=e) return tree[i];
        int m = (l+r)>>1;
        return min(getRange(i*2, l, m, s, e), getRange(i*2+1, m+1, r, s, e));
    }
} tree;

int n, m;
int par[200002];
int parSuffix[200002];

int main(){
    scanf("%d %d", &n, &m);
    for(int i=1; i<=n; i++) par[i] = i;
    for(int i=1; i<=m; i++){
        int x, y;
        scanf("%d %d", &x, &y);
        if(x>y) swap(x, y);
        par[y] = min(par[y], x);
    }
    parSuffix[n+1] = 1e9;
    for(int i=n; i>=1; i--){
        parSuffix[i] = min(parSuffix[i+1], par[i]);
    }

    for(int i=2; i<=n; i++){
        tree.update(1, 1, n, 1, min(i-1, par[i]-1), 1);
        int tmp = tree.getRange(1, 1, n, 1, min(i-1, parSuffix[i+1]-1));
        tree.update(1, 1, n, i, i, tmp);
    }

    printf("%d", tree.getRange(1, 1, n, n, n));
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:51:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 252 KB Output is correct
11 Correct 1 ms 204 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 252 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 252 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 4 ms 460 KB Output is correct
24 Correct 4 ms 460 KB Output is correct
25 Correct 7 ms 432 KB Output is correct
26 Correct 7 ms 460 KB Output is correct
27 Correct 7 ms 460 KB Output is correct
28 Correct 7 ms 444 KB Output is correct
29 Correct 4 ms 460 KB Output is correct
30 Correct 11 ms 452 KB Output is correct
31 Correct 11 ms 460 KB Output is correct

Subtask #3
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 252 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 252 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 4 ms 460 KB Output is correct
24 Correct 4 ms 460 KB Output is correct
25 Correct 7 ms 432 KB Output is correct
26 Correct 7 ms 460 KB Output is correct
27 Correct 7 ms 460 KB Output is correct
28 Correct 7 ms 444 KB Output is correct
29 Correct 4 ms 460 KB Output is correct
30 Correct 11 ms 452 KB Output is correct
31 Correct 11 ms 460 KB Output is correct
32 Correct 174 ms 5900 KB Output is correct
33 Correct 188 ms 5928 KB Output is correct
34 Correct 178 ms 5572 KB Output is correct
35 Correct 228 ms 5920 KB Output is correct
36 Correct 218 ms 5936 KB Output is correct
37 Correct 220 ms 5924 KB Output is correct
38 Correct 175 ms 5992 KB Output is correct
39 Correct 183 ms 5912 KB Output is correct
40 Correct 100 ms 3112 KB Output is correct
41 Correct 185 ms 5544 KB Output is correct
42 Correct 233 ms 5940 KB Output is correct
43 Correct 229 ms 5940 KB Output is correct
44 Correct 1 ms 204 KB Output is correct
45 Correct 1 ms 204 KB Output is correct