Submission #54043

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Source Code Expand

#include <algorithm>
#include <cstdio>
#include <vector>

using namespace std;

typedef vector<int>::iterator Follower;
typedef vector<Follower> Followers;

int main()
{
    int n, m, l;
    scanf("%d%d%d", &n, &m, &l);

    vector<Followers> follows(n);
    vector<int> cnt(n, 0);
    for (int i = 0; i < n; i++) {
        follows[i].push_back(cnt.begin() + i);
    }

    for (int i = 0; i < m; i++) {
        char action[2];
        scanf("%1s", &action);

        if (*action == 't') {  // tweet
            int j;
            scanf("%d", &j); --j;
            const Followers& v = follows[j];
            for (Followers::const_iterator p = v.begin(); p != v.end(); ++p) {
                ++(**p);
            }
            continue;
        }
        if (*action == 'f') {  // follow
            int j, k;
            scanf("%d%d", &j, &k); --j, --k;
            follows[j].push_back(cnt.begin() + k);
            follows[k].push_back(cnt.begin() + j);
            continue;
        }
        if (*action == 'u') {  // unfollow
            int j, k;
            scanf("%d%d", &j, &k); --j, --k;
            Followers::iterator pj = find(
                follows[j].begin(), follows[j].end(), cnt.begin() + k);
            swap(*pj, follows[j].back());
            follows[j].pop_back();
            Followers::iterator pk = find(
                follows[k].begin(), follows[k].end(), cnt.begin() + j);
            swap(*pk, follows[k].back());
            follows[k].pop_back();
            continue;
        }
    }

    nth_element(cnt.begin(), cnt.begin() + n - l, cnt.end());
    printf("%d\n", cnt[n - l]);

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:23:29: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2]’ [-Wformat]
./Main.cpp:13:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
./Main.cpp:23:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
./Main.cpp:27:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
./Main.cpp:36:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
./Main.cpp:43:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]

Judge Result