2018CCPC吉林賽區（重現賽）

http://acm.hdu.edu.cn/contests/contest_show.php?cid=867

A題，直接分塊，不知道正解是什麼。

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

ll sum(int n){
    ll ans=0;
    for(ll l=1,r;l<=n;l=r+1){
        r=n/(n/l);
        ans+=(r-l+1)*(n/l);
    }
    return ans;
}

int main() {
#ifdef Yinku
    freopen("Yinku.in", "r", stdin);
    //freopen("Yinku.out", "w", stdout);
#endif // Yinku
    int q;
    while(~scanf("%d", &q)) {
        for(int qi = 1; qi <= q; qi++) {
            int n;
            scanf("%d", &n);
            printf("Case %d: %s\n", qi, sum(n) & 1 ? "odd" : "even");
        }
    }
}

B題，不是很懂12小時爲何把0寫做12，中午12點是12:00 PM。半夜是12:00 AM。

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

int h, m;
char ap[4];
void input_time() {
    scanf("%d:%d %s", &h, &m, ap);
    if(strcmp(ap, "AM") == 0) {
        if(h == 12)
            h -= 12;
    } else {
        if(h != 12)
            h += 12;
    }
}

void input_city() {
    char s1[40], s2[40];
    scanf("%s%s", s1, s2);
    int dh = 0,dh2;
    switch(s1[0]) {
        case 'B':
            dh = +8;
            break;
        case 'W':
            dh = -5;
            break;
        case 'L':
            dh = 0;
            break;
        case 'M':
            dh = 3;
            break;
    }
    switch(s2[0]) {
        case 'B':
            dh2 = +8;
            break;
        case 'W':
            dh2 = -5;
            break;
        case 'L':
            dh2 = 0;
            break;
        case 'M':
            dh2 = 3;
            break;
    }
    h+=dh2-dh;
}

void output_time() {
    if(h<0){
        printf("Yesterday ");
        h+=24;
    }
    else if(h>=24){
        printf("Tomorrow ");
        h-=24;
    }
    else{
        printf("Today ");
    }

    if(h<12){
        if(h==0)
            h+=12;
        strcpy(ap,"AM");
    }
    else{
        if(h!=12)
            h-=12;
        strcpy(ap,"PM");
    }
    printf("%d:%02d %s",h,m,ap);
}

int main() {
#ifdef Yinku
    freopen("Yinku.in", "r", stdin);
    //freopen("Yinku.out", "w", stdout);
#endif // Yinku
    int q;
    while(~scanf("%d", &q)) {
        for(int qi = 1; qi <= q; qi++) {
            input_time();
            input_city();
            printf("Case %d: ", qi);
            output_time();
            putchar('\n');
        }
    }
}