what is the day

#include <cstdio>
int main(){
    int kase, aNum, bNum, i;
    scanf("%d", &kase);
    while(kase--){
        scanf("%d%d", &aNum, &bNum);
        int sum1 = 0, sum2 = 0, t;
        for(i = 0; i < aNum; i++){
            scanf("%d", &t);
            sum1 += t;
        }
        for(i = 0; i < bNum; i++){
            scanf("%d", &t);
            sum2 += t;
        }
        if(sum1 == sum2)
            printf("Draw\n");
        else printf("%s\n", sum1 > sum2 ? "Calem" : "Serena");
    }
    return 0;
}

#include <stdio.h>/*int pos[9][9]={{0,0,0,0,0,0,0,0},{0,1,1,1,1,1,1,1},{0,2,4,1,2,4,1,2},{0,3,2,6,4,5,1,3},{0,4,2,1,4,2,1,4},{0,5,4,6,2,3,1,5},{0,6,1,6,1,6,1,6,1},{0,0,0,0,0,0,0,0}};*/char WD[7][10] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};int pos[9][9]={{0,0,0,0,0,0,0,0},{0,1,4,6,4,3,1,0},{0,1,1,4,2,1,6,0},{0,1,2,5,1,5,1,0},{0,1,4,1,4,5,6,0},{0,1,1,3,2,4,1,0},{0,1,2,3,1,6,6,0},{0,1,4,2,4,2,1,0}};int mod_sum(int n){ int ans=0; for(int i=1;i<=n;i++){ for(int j=1;j<=7;j++) ans+=pos[i][j]; } return ans%7; }int mod_end_sum(int end_r){ int ans=0; for(int i=1;i<=end_r;i++) for(int j=1;j<=7;j++) { ans+=pos[i][j]; } return ans%7;}int end_line_sum(int end_r,int end_c){ int ans=0; for(int i=1;i<=end_c;i++) ans += pos[end_r+1][i]; return ans%7;}int main(){ int N; int mod_N,d_d_N,d_mod_N,d_N; int tcase; int mod_all=mod_sum(7); scanf("%d",&tcase); while(tcase--){ scanf("%d",&N); int sum=0; d_mod_N=0; mod_N=0; mod_N=N%7; if(mod_N==0) mod_N=7; d_N=N/7; if(d_N>0){ d_mod_N=d_N%7; d_d_N=d_N/7; if(d_mod_N==0) d_mod_N=7; if(d_d_N>0) sum+=d_d_N*mod_all%7; sum+=mod_end_sum(d_mod_N); } sum+=end_line_sum(d_mod_N,mod_N); if(sum%7) sum=sum%7; else sum=7; printf("%s\n",WD[sum-1]); } return 0; }

表达式

#include <cstdio>
#include <cstring>
#include <stack>
using namespace std;

struct node{
    int v;
    node *l, *r;
    node(int c){
        v = c;
        l = r = NULL;
    }
};
stack<node*> p;
stack<char> q;
char str[1024];
int len;

int getOrder(char c){
    switch(c){
        case '+': case '-':
            return 0;
        case '*': case '/': case '%':
            return 1;
    }
}

void PUSH(int &i){
    int tmp = 0;
    while(str[i] <= '9' && str[i] >= '0'){
        tmp *= 10;
        tmp += str[i] - '0';
        i++;
    }
    node *t = new node(tmp);
    p.push(t);
    i--;
}
void buildNode(){
    node *t1, *t2;
    char s;
    
    t2 = p.top(); p.pop();
    t1 = p.top(); p.pop();
    s = q.top(); q.pop();
    
    node *N = new node(s);
    N->l = t1;
    N->r = t2;
    
    p.push(N);
}
void buildTree(){
    for(int i = 0; i < len; i++){
        //printf("Accessing char \"%c\"\n", str[i]);
        if(str[i] == ' ') continue;
        else if(str[i] >= '0' && str[i] <= '9')
            PUSH(i);
        else{
            if(!q.empty() && getOrder(q.top()) >= getOrder(str[i]))
                buildNode();
            q.push(str[i]);
        }
    }
    while(!q.empty()) buildNode();
}
void POTraverse(node *t){
    if(t){
        POTraverse(t->l);
        POTraverse(t->r);
        printf("%c", t->v);
    }
}
int calc(int a, int b, char s){
    switch(s){
        case '+':
            return a + b;
        case '-':
            return a - b;
        case '*':
            return a * b;
        case '/':
            return a / b;
        case '%':
            return a % b;
    }
}
int solveIt(node *t){
    if(t){
        if(!t->l){
            //printf("Accessing Operand %d\n", t->v);
            return t->v;
        }else{
            //printf("Accessing Operator %c\n", t->v);
            int a = solveIt(t->l);
            int b = solveIt(t->r);
            return calc(a, b, t->v);
        }
    }
    return 0;
}

int main(){
    int kase;
    scanf("%d ", &kase);
    while(kase--){
        //scanf("%s", str);
        gets(str);
        len = strlen(str);
        buildTree();
        //POTraverse(p.top());
        //printf("\n");
        printf("%d\n", solveIt(p.top()));
        p.pop();
    }
    return 0;
}