oj.uz

Submission #77022

# Submission time Handle Problem Language Result Execution time Memory
77022 2018-09-20T05:37:58 Z win11905 One-Way Streets (CEOI17_oneway) C++11
100 / 100
 138 ms 47064 KB 
#include <bits/stdc++.h>
#define pii pair<int, int>
#define x first
#define y second
using namespace std;

const int N = 1e5+5;

int n, m, p, d1[N], d2[N];
char Answer[N];
bitset<N> check, checkE;
pii E[N];
vector<pii> g[N];

void dfs(int u, int p) {
    check[u] = true;
    for(pii v : g[u]) if(v.x != p) {
        if(check[v.x]) { if(E[v.y].x == u) swap(E[v.y].x, E[v.y].y); }
        else checkE[v.y] = true, dfs(v.x, u);
    }
}

void solve(int u, int p) {
    check[u] = false;
    for(pii v : g[u]) if(v.x != p) if(check[v.x]) {
        solve(v.x, u);
        Answer[v.y] = 'B';
        d1[u] += d1[v.x], d2[u] += d2[v.x];
        if(d1[v.x] || !d2[v.x]) continue;
        Answer[v.y] = (d2[v.x] > 0 ? v.x : u) == E[v.y].x ? 'R' : 'L'; 
    } 
}

int main() {
    scanf("%d %d", &n, &m);
    for(int i = 0, u, v; i < m; ++i) {
        scanf("%d %d", &u, &v);
        g[u].emplace_back(v, i), g[v].emplace_back(u, i);
        E[i] = pii(u, v);
    }
    for(int i = 1; i <= n; ++i) if(!check[i]) dfs(i, 0);
    for(int i = 0; i < m; ++i) if(!checkE[i]) Answer[i] = 'B', d1[E[i].x]++, d1[E[i].y]--;
    scanf("%d", &p);
    for(int i = 0, a, b; i < p; ++i) {
        scanf("%d %d", &a, &b);
        d2[a]++, d2[b]--;
    }
    for(int i = 1; i <= n; ++i) if(check[i]) solve(i, 0);
    printf("%s", Answer);
}

Compilation message

oneway.cpp: In function 'int main()':
oneway.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
oneway.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &u, &v);
         ~~~~~^~~~~~~~~~~~~~~~~
oneway.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &p);
     ~~~~~^~~~~~~~~~
oneway.cpp:45:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 5 ms 2872 KB Output is correct
4 Correct 5 ms 2872 KB Output is correct
5 Correct 5 ms 3116 KB Output is correct
6 Correct 5 ms 3116 KB Output is correct
7 Correct 4 ms 3316 KB Output is correct
8 Correct 4 ms 3316 KB Output is correct
9 Correct 5 ms 3316 KB Output is correct
10 Correct 5 ms 3316 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 5 ms 2872 KB Output is correct
4 Correct 5 ms 2872 KB Output is correct
5 Correct 5 ms 3116 KB Output is correct
6 Correct 5 ms 3116 KB Output is correct
7 Correct 4 ms 3316 KB Output is correct
8 Correct 4 ms 3316 KB Output is correct
9 Correct 5 ms 3316 KB Output is correct
10 Correct 5 ms 3316 KB Output is correct
11 Correct 57 ms 9320 KB Output is correct
12 Correct 73 ms 11272 KB Output is correct
13 Correct 78 ms 13272 KB Output is correct
14 Correct 93 ms 15040 KB Output is correct
15 Correct 107 ms 16152 KB Output is correct
16 Correct 98 ms 16152 KB Output is correct
17 Correct 76 ms 18296 KB Output is correct
18 Correct 76 ms 18296 KB Output is correct
19 Correct 79 ms 21592 KB Output is correct
20 Correct 66 ms 21592 KB Output is correct
21 Correct 75 ms 21592 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 5 ms 2872 KB Output is correct
4 Correct 5 ms 2872 KB Output is correct
5 Correct 5 ms 3116 KB Output is correct
6 Correct 5 ms 3116 KB Output is correct
7 Correct 4 ms 3316 KB Output is correct
8 Correct 4 ms 3316 KB Output is correct
9 Correct 5 ms 3316 KB Output is correct
10 Correct 5 ms 3316 KB Output is correct
11 Correct 57 ms 9320 KB Output is correct
12 Correct 73 ms 11272 KB Output is correct
13 Correct 78 ms 13272 KB Output is correct
14 Correct 93 ms 15040 KB Output is correct
15 Correct 107 ms 16152 KB Output is correct
16 Correct 98 ms 16152 KB Output is correct
17 Correct 76 ms 18296 KB Output is correct
18 Correct 76 ms 18296 KB Output is correct
19 Correct 79 ms 21592 KB Output is correct
20 Correct 66 ms 21592 KB Output is correct
21 Correct 75 ms 21592 KB Output is correct
22 Correct 118 ms 25124 KB Output is correct
23 Correct 133 ms 25752 KB Output is correct
24 Correct 138 ms 28084 KB Output is correct
25 Correct 119 ms 34884 KB Output is correct
26 Correct 116 ms 34884 KB Output is correct
27 Correct 108 ms 35156 KB Output is correct
28 Correct 74 ms 35156 KB Output is correct
29 Correct 98 ms 37968 KB Output is correct
30 Correct 101 ms 40356 KB Output is correct
31 Correct 114 ms 42884 KB Output is correct
32 Correct 102 ms 47064 KB Output is correct