PAT B1028 人口普查（20）

课本AC代码

#include <cstdio>

struct person {
    char name[10];
    int yy, mm, dd;
} oldest, youngest, left, right, temp;

bool LessEqu(person a, person b) {
    if(a.yy != b.yy) return a.yy <= b.yy;
    else if(a.mm != b.mm) return a.mm <= b.mm;
    else return a.dd <= b.dd;
}

bool MoreEqu(person a, person b) {
    if(a.yy != b.yy) return a.yy >= b.yy;
    else if(a.mm != b.mm) return a.mm >= b.mm;
    else return a.dd >= b.dd;
}

void init() {
    youngest.yy = left.yy = 1814;
    oldest.yy = right.yy = 2014;
    youngest.mm = oldest.mm = left.mm = right.mm = 9;
    youngest.dd = oldest.dd = left.dd = right.dd = 6;
}

int main() {
    init();
    #ifdef ONLINE_JUDGE
    #else
        freopen("1.txt", "r", stdin);
    #endif // ONLINE_JUDGE
    int n, num = 0;
    scanf("%d", &n);
    for(int i = 0; i < n; i++) {
        scanf("%s %d/%d/%d", temp.name, &temp.yy, &temp.mm, &temp.dd);
        int n = 0, m = 0;
        if(MoreEqu(temp, left) && LessEqu(temp, right)) {
            num++;
            if(LessEqu(temp, oldest)) oldest = temp;
            if(MoreEqu(temp, youngest)) youngest = temp;
        }
    }
    if(num == 0) printf("0\n");
    else printf("%d %s %s\n", num, oldest.name, youngest.name);
    return 0;
}

自己的，两个没过

#include <cstdio>
#include <cstring>

const int nowyear = 2014;
const int nowmonth = 9;
const int nowday = 6;
const int oldyear = 2014 - 200;

struct People {
    char name[50];
    int year, month, day;
} temp, oldest, youngest, inleft, inright;

bool right(People a, People b) {    //判断出生日期是否比现在早
    if(a.year == b.year) {
        if(a.month == b.month) {
            if(a.day == b.day) return true;
            else return b.day > a.day;
        } else return b.month > a.month;
    } else return b.year > a.year;
}

bool left(People a, People b) {       //判断出生日期是否大于最早日期
    if(a.year == b.year) {
        if(a.month == b.month) {
            if(a.day == b.day) return true;
            else return a.day > b.day; //a.day - b.day;
        } else return a.month > b.month; //a.month - b.month;
    }else return a.year > b.year; //a.year - b.year;
}
bool judge(People a) {      //判断日期是否合理
    if(left(inright, a) && right(inleft, a)) return true;
    else return false;
}

void init() {
    oldest.year = inright.year = nowyear;
    youngest.year = inleft.year = nowyear - 200;
    oldest.month = youngest.month = inright.month = inleft.month = nowmonth;
    oldest.day = youngest.day = inright.month = inleft.day = nowday;
}

int main() {
    #ifdef ONLINE_JUDGE
    #else
        freopen("1.txt", "r", stdin);
    #endif
    init();
    int n;  //生日的个数
    int a = 0;  //有效生日个数
    scanf("%d", &n);
    for(int i = 0; i < n; i++) {
        scanf("%s %d/%d/%d", temp.name, &temp.year, &temp.month, &temp.day);
        //printf("%s %d/%d/%d\n", temp.name, temp.year, temp.month, temp.day);
        int n = 0, m = 0;
        //  n = right()
        if(judge(temp)) {
            a++;    //有效生日个数加1
            if(right(youngest, temp)) youngest = temp;
            if(left(oldest, temp)) oldest = temp;
            //printf("youngest:%s oldest:%s\n", youngest.name, oldest.name);
        }
    }
    if(a == 0) printf("0\n");
    else printf("%d %s %s", a, oldest.name, youngest.name);
    return 0;
}