61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
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/**
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* File: coin_change_greedy.cpp
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* Created Time: 2023-07-20
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* Author: krahets (krahets@163.com)
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*/
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#include "../utils/common.hpp"
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/* <20><>Ǯ<EFBFBD>һ<EFBFBD><D2BB><EFBFBD>̰<EFBFBD><CCB0> */
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int coinChangeGreedy(vector<int> &coins, int amt) {
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// <20><><EFBFBD><EFBFBD> coins <20>б<EFBFBD><D0B1><EFBFBD><EFBFBD><EFBFBD>
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int i = coins.size() - 1;
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int count = 0;
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// ѭ<><D1AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̰<EFBFBD><CCB0>ѡ<EFBFBD><D1A1><EFBFBD><EFBFBD>ֱ<EFBFBD><D6B1><EFBFBD><EFBFBD>ʣ<EFBFBD><CAA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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while (amt > 0) {
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// <20>ҵ<EFBFBD>С<EFBFBD><D0A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӽ<EFBFBD>ʣ<EFBFBD><CAA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><D3B2>
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while (i > 0 && coins[i] > amt) {
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i--;
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}
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// ѡ<><D1A1> coins[i]
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amt -= coins[i];
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count++;
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}
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// <20><>δ<EFBFBD>ҵ<EFBFBD><D2B5><EFBFBD><EFBFBD>з<EFBFBD><D0B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> -1
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return amt == 0 ? count : -1;
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}
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/* Driver Code */
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int main() {
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// ̰<>ģ<EFBFBD><C4A3>ܹ<EFBFBD><DCB9><EFBFBD>֤<EFBFBD>ҵ<EFBFBD>ȫ<EFBFBD><C8AB><EFBFBD><EFBFBD><EFBFBD>Ž<EFBFBD>
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vector<int> coins = {1, 5, 10, 20, 50, 100};
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int amt = 186;
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int res = coinChangeGreedy(coins, amt);
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cout << "\ncoins = ";
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printVector(coins);
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cout << "amt = " << amt << endl;
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cout << "<EFBFBD>յ<EFBFBD> " << amt << " <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><D3B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ " << res << endl;
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// ̰<>ģ<EFBFBD><C4A3><EFBFBD><DEB7><EFBFBD>֤<EFBFBD>ҵ<EFBFBD>ȫ<EFBFBD><C8AB><EFBFBD><EFBFBD><EFBFBD>Ž<EFBFBD>
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coins = {1, 20, 50};
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amt = 60;
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res = coinChangeGreedy(coins, amt);
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cout << "\ncoins = ";
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printVector(coins);
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cout << "amt = " << amt << endl;
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cout << "<EFBFBD>յ<EFBFBD> " << amt << " <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><D3B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ " << res << endl;
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cout << "ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ 3 <20><><EFBFBD><EFBFBD> 20 + 20 + 20" << endl;
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// ̰<>ģ<EFBFBD><C4A3><EFBFBD><DEB7><EFBFBD>֤<EFBFBD>ҵ<EFBFBD>ȫ<EFBFBD><C8AB><EFBFBD><EFBFBD><EFBFBD>Ž<EFBFBD>
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coins = {1, 49, 50};
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amt = 98;
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res = coinChangeGreedy(coins, amt);
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cout << "\ncoins = ";
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printVector(coins);
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cout << "amt = " << amt << endl;
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cout << "<EFBFBD>յ<EFBFBD> " << amt << " <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><D3B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ " << res << endl;
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cout << "ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ 2 <20><><EFBFBD><EFBFBD> 49 + 49" << endl;
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return 0;
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}
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