題目 A1016 Phone Bills
-
題意
給出一天24小時每個小時的分鐘計費,然後給出用戶及其通話記錄,判斷其中有效的記錄,計算產生費用,最終採用名字升序的順序給出用戶的月賬單。 -
思路
主要要實現三個模塊:
① 將按題意記錄排序(name, day, hour, minute遞增)
② 獲取其中的有效記錄(採用needPrint
去記錄,遇到on = 1, 下一個再遇到off = 2 即爲有效記錄)
③ 計算分鐘數及話費 (因爲計費是按分鐘收費,所以以每分鐘的增幅去向off靠攏即可)
注意:
on和off相鄰纔算是有效的一條通話記錄,即x[i] == "on-line" && x[i-1] == "off-line"
。 -
Code in C++
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <string>
#define maxn 1001
struct record {
std::string name;
int month;
int day;
int hour;
int minute;
std::string word;
void print() {
std::cout << name << " " << month << ":" << day << ":" << hour << ":" << minute << " " << word << std::endl;
}
} records[maxn], tmp;
bool cmp(const record &a, const record &b) {
if (a.name != b.name) return a.name < b.name;
else if (a.month != b.month) return a.month < b.month;
else if (a.day != b.day) return a.day < b.day;
else if (a.hour != b.hour) return a.hour < b.hour;
else if (a.minute != b.minute) return a.minute < b.minute;
}
int toll[24] = {0};
void get_ans(int on, int off, int &time, int &money) {
tmp = records[on];
while (tmp.day < records[off].day || tmp.hour < records[off].hour || tmp.minute < records[off].minute) {
++time;
money += toll[tmp.hour];
++tmp.minute;
if (tmp.minute == 60) {
tmp.minute = 0;
tmp.hour++;
}
if (tmp.hour == 24) {
tmp.hour = 0;
tmp.day++;
}
}
}
int main()
{
for (int i = 0; i < 24; ++i) {
scanf("%d", &toll[i]);
}
int n;
scanf("%d", &n);
for (int i = 0; i < n; ++i) {
std::cin >> records[i].name;
scanf("%d:%d:%d:%d", &records[i].month, &records[i].day, &records[i].hour, &records[i].minute);
std::cin >> records[i].word;
}
std::sort(records, records + n, cmp);
// 篩選有效的
int on = 0, off, next; // on和off是配對的一條,next爲下一個用戶
while (on < n) {
int needPrint = 0; // 記錄是否找到有效記錄 2爲找到
next = on; // 從on開始掃描
while (next < n && records[next].name == records[on].name) {
if (needPrint == 0 && records[next].word == "on-line") {
needPrint = 1;
} else if (needPrint == 1 && records[next].word == "off-line") {
needPrint = 2;
}
++next;
}
if (needPrint < 2) {
on = next;
continue;
}
int allMoney = 0;
printf("%s %02d\n", records[on].name.c_str(), records[on].month);
while (on < next) {
while (on < next -1 && !(records[on].word == "on-line" && records[on + 1].word == "off-line")) {
++on;
}
off = on + 1;
if (off == next) {
on = next;
break;
}
printf("%02d:%02d:%02d ", records[on].day, records[on].hour, records[on].minute);
printf("%02d:%02d:%02d ", records[off].day, records[off].hour, records[off].minute);
int time = 0, money = 0;
get_ans(on, off, time, money);
allMoney += money;
printf("%d $%.2f\n", time, money / 100.0); // cents -> dollar
on = off + 1;
}
printf("Total amount: $%.2f\n", allMoney / 100.0);
}
return 0;
}
小結
- 先僞碼大概思路模塊化,然後再一個模塊一個模塊的去攻克。
1 dollar = 100 cents
PS:
稍微有點畏難,有點怕麻煩吧,還覺得自己的思路有點暴力,但是看了解答好像也是暴力的方式。然後以後要是沒思路的話先看思路然後自己寫寫看,實在不行再看解答。