oj.uz

Submission #66071

# Submission time Handle Problem Language Result Execution time Memory
66071 2018-08-09T13:32:06 Z ikura355 007 (CEOI14_007) C++14
66.6667 / 100
 467 ms 18684 KB 
#include<bits/stdc++.h>
using namespace std;

const int maxn = 2e5 + 5;
const int inf = 1e9;

int n,m,a,b,s1,s2;
vector<int> way[maxn];
int d[2][maxn];
int q[maxn];
int p[maxn], wow[maxn];

int sssp(int k, int u) {
    int l = 1, r = 0;
	for(int i=1;i<=n;i++) d[k][i] = inf;
	d[k][u] = 0; q[++r] = u;
	while(l<=r) {
		int u = q[l++];
		for(auto v : way[u]) {
			if(d[k][v] > d[k][u] + 1) {
				d[k][v] = d[k][u] + 1; q[++r] = v;
			}
		}
	}
}

bool cmp(int x, int y) {
    if(d[0][x]!=d[0][y]) return d[0][x] < d[0][y];
    if(d[1][x]!=d[1][y]) return d[1][x] < d[1][y];
    return x<y;
}

int main() {
	scanf("%d%d",&n,&m);
	scanf("%d%d%d%d",&a,&b,&s1,&s2);
	for(int i=1;i<=m;i++) {
		int u,v; scanf("%d%d",&u,&v);
		way[u].push_back(v); way[v].push_back(u);
	}
	sssp(0,s1); sssp(1,s2);
	if(d[0][a]>d[0][b] || d[1][a]>d[1][b]) return !printf("-1");
    int res = min(d[0][b]-d[0][a], d[1][b]-d[1][a]);
    if(res==0) return !printf("0");
//    printf("res = %d\n",res);
    if(d[0][a] == d[1][a] && d[0][b] == d[1][b]) {
        for(int i=1;i<=n;i++) p[i] = i;
        sort(&p[1],&p[n],cmp);
        for(int i=1;i<=n;i++) {
            int u = p[i];
            for(auto v : way[u]) {
                if(d[0][v]==d[0][u]+1 && d[1][v]==d[1][u]+1) wow[v] = max(wow[v], wow[u]+1);
            }
//            printf("wow %d = %d\n",u,wow[u]);
        }
        if(wow[a]+res<wow[b]) res = res-1;
    }
    printf("%d",res);
}

Compilation message

007.cpp: In function 'int sssp(int, int)':
007.cpp:25:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
007.cpp: In function 'int main()':
007.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
007.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d",&a,&b,&s1,&s2);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
007.cpp:37:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int u,v; scanf("%d%d",&u,&v);
            ~~~~~^~~~~~~~~~~~~~

Subtask #1
20.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4984 KB Output is correct
2 Correct 6 ms 5096 KB Output is correct
3 Correct 7 ms 5276 KB Output is correct
4 Incorrect 7 ms 5276 KB Output isn't correct
5 Correct 7 ms 5276 KB Output is correct
6 Correct 6 ms 5280 KB Output is correct
7 Correct 8 ms 5324 KB Output is correct
8 Correct 7 ms 5324 KB Output is correct
9 Correct 7 ms 5324 KB Output is correct
10 Correct 6 ms 5324 KB Output is correct
11 Correct 6 ms 5324 KB Output is correct
12 Correct 6 ms 5324 KB Output is correct
13 Correct 7 ms 5336 KB Output is correct
14 Correct 7 ms 5336 KB Output is correct
15 Correct 8 ms 5336 KB Output is correct
16 Correct 8 ms 5336 KB Output is correct
17 Correct 8 ms 5336 KB Output is correct
18 Correct 7 ms 5336 KB Output is correct
19 Correct 7 ms 5336 KB Output is correct
20 Correct 8 ms 5336 KB Output is correct
21 Correct 8 ms 5336 KB Output is correct
22 Correct 7 ms 5336 KB Output is correct
23 Correct 8 ms 5460 KB Output is correct
24 Correct 7 ms 5460 KB Output is correct

Subtask #2
46.666667 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 7404 KB Output is correct
2 Incorrect 84 ms 8292 KB Output isn't correct
3 Correct 56 ms 8292 KB Output is correct
4 Correct 87 ms 8548 KB Output is correct
5 Correct 37 ms 8548 KB Output is correct
6 Correct 32 ms 8548 KB Output is correct
7 Correct 48 ms 8548 KB Output is correct
8 Correct 57 ms 8548 KB Output is correct
9 Correct 77 ms 8548 KB Output is correct
10 Correct 247 ms 12660 KB Output is correct
11 Correct 97 ms 12660 KB Output is correct
12 Correct 145 ms 12660 KB Output is correct
13 Correct 120 ms 12660 KB Output is correct
14 Correct 81 ms 12660 KB Output is correct
15 Correct 156 ms 12660 KB Output is correct
16 Correct 122 ms 12660 KB Output is correct
17 Correct 131 ms 12660 KB Output is correct
18 Correct 141 ms 12660 KB Output is correct
19 Correct 184 ms 12660 KB Output is correct
20 Correct 385 ms 14972 KB Output is correct
21 Correct 205 ms 14972 KB Output is correct
22 Correct 154 ms 14972 KB Output is correct
23 Correct 192 ms 14972 KB Output is correct
24 Correct 273 ms 14972 KB Output is correct
25 Correct 169 ms 14972 KB Output is correct
26 Correct 115 ms 14972 KB Output is correct
27 Correct 219 ms 14972 KB Output is correct
28 Correct 234 ms 14972 KB Output is correct
29 Correct 254 ms 14972 KB Output is correct
30 Correct 393 ms 15740 KB Output is correct
31 Correct 211 ms 15740 KB Output is correct
32 Correct 202 ms 15740 KB Output is correct
33 Correct 135 ms 15740 KB Output is correct
34 Correct 254 ms 15740 KB Output is correct
35 Correct 231 ms 15740 KB Output is correct
36 Correct 184 ms 15740 KB Output is correct
37 Correct 164 ms 15740 KB Output is correct
38 Correct 253 ms 15740 KB Output is correct
39 Correct 287 ms 15740 KB Output is correct
40 Correct 340 ms 16688 KB Output is correct
41 Correct 467 ms 18684 KB Output is correct