24 lines
484 B
C++
24 lines
484 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int n, m; // n个同学，m个窗口
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const int N = 100000 + 10;
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vector<int> a[N];
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int main() {
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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int x;
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cin >> x; // 表示i号同学需要加入x号窗口
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a[x].push_back(i);
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}
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for (int i = 1; i <= m; i++) {
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cout << a[i].size() << " ";
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for (int j = 0; j < a[i].size(); j++)
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cout << a[i][j] << " ";
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cout << endl;
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}
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return 0;
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} |