noip2011普及组初赛答案_NOIP普及组和提高组的区别

#include <iostream>
using namespace std;
int main(){
    int i, n, m, ans;
    cin>>n>>m;
    i = n;
    ans = 0;
    while (i <= m){
        ans += i;
        i++;
    }
    cout<<ans<<endl;
    return 0;
}

#include <iostream>
#include <string>
using namespace std;
int main(){
    string map = "22233344455566677778889999";
    string tel;
    int i;
    cin>>tel;
    for (i = 0; i < tel.length(); i++)
        if ((tel[i] >= '0') && (tel[i] <= '9'))
            cout<<tel[i];
        else if ((tel[i] >= 'A') && (tel[i] <= 'Z'))
            cout<<map[tel[i] - 'A'];
    cout<<endl;
    return 0;
}

#include <iostream>
#include <string>
using namespace std;
const int SIZE = 200;
struct hugeint {
int len, num[SIZE];
};
//其中 len 表示大整数的位数；num[1]表示个位、num[2]表示十位，以此类推
hugeint times(hugeint a, hugeint b) {
//计算大整数 a 和 b 的乘积
int i, j; hugeint ans;
memset(ans.num, 0, sizeof(ans.num));
for (i = 1; i <= a.len; i++)
for (j = 1; j <= b.len; j++)
①+= a.num[i] * b.num[j];
for (i = 1; i <= a.len + b.len; i++) {
ans.num[i + 1] += ans.num[i] / 10;
②;
}
if (ans.num[a.len + b.len] > 0)
ans.len = a.len + b.len;
else
ans.len = a.len + b.len - 1;
return ans;
}
hugeint add(hugeint a, hugeint b){
//计算大整数 a 和 b 的和
int i; hugeint ans;
memset(ans.num, 0, sizeof(ans.num));
if (a.len > b.len)
ans.len = a.len;
else
ans.len = b.len;
for (i = 1; i <= ans.len; i++) {
ans.num[i] +=③;
ans.num[i + 1] += ans.num[i] / 10;
ans.num[i] %= 10;
}
if (ans.num[ans.len + 1] > 0) ans.len++;
return ans;
}
hugeint average(hugeint a, hugeint b){
//计算大整数 a 和 b 的平均数的整数部分
int i; hugeint ans;
ans= add(a, b);
for(i = ans.len; i >= 2; i--) {
ans.num[i  - 1] += (④) * 10;
ans.num[i] /= 2;
}
ans.num[1] /= 2;
if (ans.num[ans.len] == 0) ans.len--;
return ans;
}
hugeint plustwo(hugeint a) {
//计算大整数 a 加 2 后的结果
int i; hugeint ans;
ans = a;
ans.num[1] += 2;
i = 1;
While ((i <= ans.len) && (ans.num[i] >= 10)) {
ans.num[i + 1] += ans.num[i] / 10;
ans.num[i] %= 10;
i++;
}
if (ans.num[ans.len + 1] > 0)⑤;
return ans;
}
bool over(hugeint a, hugeint b){
//若大整数 a>b 则返回 true，否则返回 false
int i;
if (⑥) return false;
if (a.len > b.len) return true;
for (i = a.len; i >= 1; i--) {
if (a.num[i] < b.num[i])return false;
if (a.num[i] > b.num[i]) return true;
}
return false;
}
int main(){
string s;
int i;
hugeint target, left, middle, right;
cin>>s;
memset(target.num, 0, sizeof(target.num));
target.len = s.length();
for (i = 1; i <= target.len; i++)
target.num[i]= s[target.len  - i] - ⑦;
memset(left.num, 0, sizeof(left.num));
left.len = 1;
left.num[1] = 1;
right = target;
do {
middle = average(left, right);
if (over(⑧))right = middle;
else left = middle;
} while (!over(plustwo(left), right));
for (i = left.len; i >= 1; i--)
cout<<left.num[i];
cout<<endl;
return 0;
}