oj.uz

Submission #860119

# Submission time Handle Problem Language Result Execution time Memory
860119 2023-10-11T16:55:00 Z hariaakas646 One-Way Streets (CEOI17_oneway) C++14
100 / 100
 96 ms 22768 KB 
#include <bits/stdc++.h>

using namespace std;

#define scd(t) scanf("%d", &t)
#define sclld(t) scanf("%lld", &t)
#define forr(i, j, k) for (int i = j; i < k; i++)
#define frange(i, j) forr(i, 0, j)
#define all(cont) cont.begin(), cont.end()
#define mp make_pair
#define pb push_back
#define f first
#define s second
typedef long long int lli;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<lli> vll;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vi> vvi;
typedef map<int, int> mpii;
typedef set<int> seti;
typedef multiset<int> mseti;
typedef long double ld;


void usaco()
{
    freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
//    freopen("problem.out", "w", stdout);
}

vector<vii> graph;
vii edge;
vb dfstree;
vb vis;

void dfs(int x) {
    vis[x] = true;
    for(auto e : graph[x]) {
        if(!vis[e.f] && e.f != x) {
            dfstree[e.s] = true;
            dfs(e.f);
        }
    }
} 

vb bridg;
vector<vii> tree;
vb on;
vi dp;
vi pos;
int c = 0;

void dfs2(int x, int p) {
    vis[x] = true;
    for(auto e : graph[x]) {
        if(!dfstree[e.s] && e.f != x) {
            if(!vis[e.f]) {
                dp[x]--;
            }
            else {
                dp[x]++;
            }
        }
    }

    for(auto e : tree[x]) {
        if(e.f != p && e.f != x) {
            dfs2(e.f, x);
            dp[x] += dp[e.f];
            pos[e.f] = e.s;
        }
    }
}

vi out;

vii val;
vi en, st;

void assg(int a, int b, int id) {
    if(edge[id].f == a) out[id] = 1;
    else out[id] = -1;
}

int dfs3(int x, int p) {
    vis[x] = true;
    int c1 = 0;
    c1 += st[x];
    c1 -= en[x];

    for(auto e : tree[x]) {
        if(e.f != p && e.f != x) {
            int v = dfs3(e.f, x);

            if(bridg[e.s]) {if(v > 0) {
                            assg(e.f, x, e.s);
                        }
                        else if(v < 0) assg(x, e.f, e.s);}
            c1 += v;
        }
    }
    return c1;
}

int main() {
    // usaco();
    int n, m, p;
    scd(n);
    scd(m);
    
    graph = vector<vii>(n+1);
    dfstree = vb(m);
    edge = vii(m);

    frange(i, m) {
        int a, b;
        scd(a);
        scd(b);
        graph[a].pb(mp(b, i));
        graph[b].pb(mp(a, i));
        edge[i] = mp(a, b);
    }

    vis = vb(n+1);
    forr(i, 1, n+1) {
        if(!vis[i]) dfs(i);
    }

    bridg = vb(m);
    tree = vector<vii>(n+1);
    frange(i, m) {
        if(dfstree[i]) {
            int a= edge[i].f;
            int b = edge[i].s;
            tree[a].pb(mp(b, i));
            tree[b].pb(mp(a, i));
            bridg[i] = true;
        }
    }

    on = vb(m);
    vis = vb(n+1);
    pos = dp = vi(n+1);
    forr(i, 1, n+1) {
        c = 0;
        if(!vis[i]) dfs2(i, 0);
    }



    forr(i, 1, n+1) {
        // printf("%d ", dp[i]);
        if(dp[i]) bridg[pos[i]] = false;
    }

    // frange(i, m) {
    //     if(bridg[i]) printf("%d %d\n", edge[i].f, edge[i].s);
    // }

    
    st = en = vi(n+1);
    scd(p);
    val = vii(p);
    frange(i, p) {
        scd(val[i].f);
        scd(val[i].s);
        // printf("%d %d\n", val[i].f, val[i].s);
        st[val[i].f]++;
        en[val[i].s]++;
    }

    out = vi(m);
    vis = vb(n+1);
    forr(i, 1, n+1) {
        if(!vis[i]) {
            dfs3(i, 0);
        }
    }
    for(auto e : out) {
        if(e == 1) printf("R");
        else if(e == -1) printf("L");
        else printf("B");
    }
}

Compilation message

oneway.cpp: In function 'void usaco()':
oneway.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
oneway.cpp: In function 'int main()':
oneway.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
oneway.cpp:111:5: note: in expansion of macro 'scd'
  111 |     scd(n);
      |     ^~~
oneway.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
oneway.cpp:112:5: note: in expansion of macro 'scd'
  112 |     scd(m);
      |     ^~~
oneway.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
oneway.cpp:120:9: note: in expansion of macro 'scd'
  120 |         scd(a);
      |         ^~~
oneway.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
oneway.cpp:121:9: note: in expansion of macro 'scd'
  121 |         scd(b);
      |         ^~~
oneway.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
oneway.cpp:165:5: note: in expansion of macro 'scd'
  165 |     scd(p);
      |     ^~~
oneway.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
oneway.cpp:168:9: note: in expansion of macro 'scd'
  168 |         scd(val[i].f);
      |         ^~~
oneway.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
oneway.cpp:169:9: note: in expansion of macro 'scd'
  169 |         scd(val[i].s);
      |         ^~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 32 ms 8004 KB Output is correct
12 Correct 39 ms 10068 KB Output is correct
13 Correct 48 ms 12880 KB Output is correct
14 Correct 60 ms 15952 KB Output is correct
15 Correct 58 ms 16720 KB Output is correct
16 Correct 54 ms 16488 KB Output is correct
17 Correct 72 ms 18072 KB Output is correct
18 Correct 84 ms 16448 KB Output is correct
19 Correct 61 ms 19132 KB Output is correct
20 Correct 52 ms 11580 KB Output is correct
21 Correct 56 ms 11328 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 32 ms 8004 KB Output is correct
12 Correct 39 ms 10068 KB Output is correct
13 Correct 48 ms 12880 KB Output is correct
14 Correct 60 ms 15952 KB Output is correct
15 Correct 58 ms 16720 KB Output is correct
16 Correct 54 ms 16488 KB Output is correct
17 Correct 72 ms 18072 KB Output is correct
18 Correct 84 ms 16448 KB Output is correct
19 Correct 61 ms 19132 KB Output is correct
20 Correct 52 ms 11580 KB Output is correct
21 Correct 56 ms 11328 KB Output is correct
22 Correct 67 ms 19792 KB Output is correct
23 Correct 96 ms 18288 KB Output is correct
24 Correct 89 ms 18384 KB Output is correct
25 Correct 77 ms 22768 KB Output is correct
26 Correct 67 ms 19332 KB Output is correct
27 Correct 68 ms 18260 KB Output is correct
28 Correct 30 ms 5456 KB Output is correct
29 Correct 59 ms 13264 KB Output is correct
30 Correct 54 ms 13396 KB Output is correct
31 Correct 60 ms 13712 KB Output is correct
32 Correct 63 ms 16724 KB Output is correct