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4004. [JLOI2015]装备购买
https://hydro.ac/d/bzoj/record/6322f021bdf9bc31d160a3f3
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BZOJ/4004/4004.cpp
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76
BZOJ/4004/4004.cpp
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#include <iostream>
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#include <algorithm>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 505;
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const double eps = 1e-4;
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int n, m, ans, sum;
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double p[N][N];
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struct node {
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int w;
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double v[N];
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double& operator[](const int& _i) {
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return v[_i];
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}
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bool operator<(const node& _y) const {
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return w < _y.w;
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}
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} q[N];
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inline bool insert(double* a) {
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for (int i = 1; i <= m; i++) {
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if (std::abs(a[i]) > eps) {
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if (std::abs(p[i][i]) > eps) { // > 0
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double k = a[i] / p[i][i];
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for (int j = i; j <= m; j++) {
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a[j] -= k * p[i][j];
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}
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} else {
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for (int j = i; j <= m; j++) {
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p[i][j] = a[j];
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}
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return true;
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}
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}
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}
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return false;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= m; j++) {
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cin >> q[i][j];
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}
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}
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for (int i = 1; i <= n; i++) {
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cin >> q[i].w;
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}
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std::sort(q + 1, q + 1 + n);
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for (int i = 1; i <= n; i++) {
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if (insert(q[i].v)) {
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ans++;
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sum += q[i].w;
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}
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}
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cout << ans << ' ' << sum << endl;
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return 0;
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}
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