标题标明注意点及相关启发
1001 简单计数器
#include<iostream>
using namespace std;
int cnt = 0;
int main(){
int n;
while(~scanf("%d", &n)) {
while(n != 1) {
if(n % 2 == 0) n /= 2;
else n = (3 * n + 1) / 2;
cnt++;
}
printf("%d", cnt);
}
return 0;
}1006 取模与基本输入输出
#include <iostream>
using namespace std;
int main()
{
int n;
int m[3];
while (~scanf("%d", &n)) {
for (int i = 0; i < 3; i++) {
m[i] = n % 10;
n /= 10;
}
for (int i = 2; i >= 0; i--) {
int j = 1;
while (m[i]--) {
if (i == 2) printf("B");
else if (i == 1) printf("S");
else printf("%d", j++);
}
}
printf("\n");
}
}1011 变量范围
#include <iostream>
using namespace std;
int main(){
long long a, b, c;
int n;
while(~scanf("%d", &n)){
int i = 1;
while(n--){
scanf("%lld%lld%lld", &a, &b, &c);
if(a + b > c) printf("Case #%d: true", i++);
else printf("Case #%d: false", i++);
printf("\n");
}
}
return 0;
}1016 大整数与十进制计算
#include<iostream>
using namespace std;
long long P(char x[], int y)
{
long long sum = 0;
for(int i = 0; x[i]; i++)
if(x[i] - '0' == y)
sum = 10 * sum + y;
return sum;
}
int main() {
char a[10], c[10];
int b, d;
while(~scanf("%s%d%s%d", &a, &b, &c, &d))
printf("%lld\n", P(a, b) + P(c, d));
return 0;
}1021 简单基数排序思想
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int main() {
int n[10];
char s[1000];
memset(n, 0, sizeof(n));
while(~scanf("%s", &s)) {
for(int i = 0; s[i]; i++)
n[s[i] - '0']++;
for(int i = 0; i < 10; i++)
if(n[i]) printf("%d:%d\n", i, n[i]);
}
return 0;
}1026 四舍五入及输出补齐
#include <iostream>
using namespace std;
int main() {
int c1, c2;
while(~scanf("%d%d", &c1, &c2)) {
int s = (c2 - c1 + 50) / 100;
int hh = s / 3600;
int mm = s % 3600 / 60;
int ss = s % 60;
printf("%02d:%02d:%02d\n", hh, mm, ss);
}
return 0;
}1031 注意变量发生变化
#include <iostream>
using namespace std;
int main() {
int w[] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
char z[] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
char s[18];
int n;
while(~scanf("%d", &n)) {
int cnt = n;
while(n--) {
int sum = 0;
bool f = true;
scanf("%s", &s);
for(int i = 0; i < 17; i++) {
if(s[i] >= '0' && s[i] <= '9')
sum += w[i] * (s[i] - '0');
else { f = false; break;};
}
if(f && z[sum % 11] == s[17]) cnt--;
else printf("%s\n", s);
}
if(cnt == 0) printf("All passed\n");
}
return 0;
}1036 空格输入1型循环四舍五入
#include <iostream>
using namespace std;
int main()
{
int n;
char c;
scanf("%d %c", &n, &c);
int end = (n + 1) / 2;
for (int i = 1; i <= end; i++) {
for (int j = 0; j < n; j++) {
if (i == 1 || i == end) printf("%c", c);
else if (j == 0 || j == n - 1) printf("%c", c);
else printf(" ");
}
printf("\n");
}
return 0;
}1041 循环体内存分配及指针数组
#include <iostream>
using namespace std;
int main()
{
int n, m;
scanf("%d", &n);
int exam[n + 1];
string atmt[n + 1];
while (n--)
{
int e, a;
char s[16];
scanf("%s%d%d", &s, &a, &e);
exam[a] = e;
atmt[a] = s;
}
scanf("%d", &m);
while (m--)
{
int t;
scanf("%d", &t);
printf("%s %d\n", atmt[t].c_str(), exam[t]);
}
return 0;
}1046 变量必赋初值及考虑异或应用
#include <iostream>
using namespace std;
int main() {
int n, a1, b1, a2, b2, c1 = 0, c2 = 0;
scanf("%d", &n);
while(n--) {
scanf("%d%d%d%d", &a1, &b1, &a2, &b2);
int r = a1 + a2;
int d1 = r == b1;
int d2 = r == b2;
if(d1 > d2) { c2++; continue; }
if(d1 < d2) c1++;
}
printf("%d %d\n", c1, c2);
return 0;
}1051 数学函数、输出小数舍入、简化
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
double r1, p1, r2, p2, a, b;
scanf("%lf%lf%lf%lf", &r1, &p1, &r2, &p2);
a = r1 * r2 * cos(p1 + p2);
b = r1 * r2 * sin(p1 + p2);
if (a < 0 && a > -0.005) a = 0.0;
if (b < 0 && b > -0.005) b = 0.0;
printf("%.2f%+.2fi", a, b);
return 0;
}1056 枚举下标、问题转化
int main() {
int n, a, sum = 0;
scanf("%d", &n);
for (int i = 0; i < n; i++) {
scanf("%d", &a);
sum += a;
}
printf("%d\n", sum * 11 * (n - 1));
return 0;
}1061 输入时&符、二维数组指针
#include <iostream>
using namespace std;
int main() {
int n, m, x, sum = 0;
scanf("%d%d", &n, &m);
int s[m], a[m], r[m];
for (int i = 0; i < m; i++)
scanf("%d", s + i);
for (int i = 0; i < m; i++)
scanf("%d", a + i);
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
scanf("%d", &x);
if (x == a[j]) sum += s[j];
}
printf("%d\n", sum);
sum = 0;
}
return 0;
}1071 运算符优先级
#include <iostream>
using namespace std;
int main()
{
int t0, k, n1, b, t, n2;
scanf("%d%d", &t0, &k);
while (k--)
{
scanf("%d%d%d%d", &n1, &b, &t, &n2);
if (t0 <= 0) { printf("Game Over.\n"); break; }
else if (t0 < t) printf("Not enough tokens. Total = %d.\n", t0);
else if ((b == 0 && n1 > n2) || (b == 1 && n1 < n2)) { t0 += t; printf("Win %d! Total = %d.\n", t, t0); }
else { t0 -= t; printf("Lose %d. Total = %d.\n", t, t0); }
}
return 0;
}1076 空格换行处理、注意索引、简化控制
#include <iostream>
using namespace std;
int main() {
char s[4];
while (~scanf("%s", &s))
if (s[2] == 'T')
printf("%d", s[0] - 'A' + 1);
return 0;
}1081 控制结构、getline
#include <iostream>
using namespace std;
int main() {
bool nF, aF, qF;
string s;
getline(cin, s);
while(getline(cin, s)) {
nF = aF = qF =false;
if(s.length() < 6) {
puts("Your password is tai duan le.");
continue;
}
for(int i = 0; s[i]; i++) {
if((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z'))
aF = true;
else if(s[i] >= '0' && s[i] <= '9')
nF = true;
else if(s[i] != '.') {
qF = true;
break;
}
}
if (qF) puts("Your password is tai luan le.");
else if(aF && nF) puts("Your password is wan mei.");
else if(aF) puts("Your password needs shu zi.");
else puts("Your password needs zi mu.");
}
return 0;
}1086 注意0的处理
#include <iostream>
using namespace std;
int main () {
int a, b;
scanf("%d%d", &a, &b);
a = a * b;
if(!a) { printf("0\n"); return 0; }
while(!(a % 10)) a /= 10;
while(a) { printf("%d", a % 10); a /= 10; }
printf("\n");
return 0;
}1091 不同类型之间运算转换
#include <iostream>
using namespace std;
int main()
{
int m, n;
long long k, l, s, t;
scanf("%d", &m);
while (m--) {
scanf("%lld", &k);
t = k;
for (s = 1; t; s *= 10)
t /= 10;
for (n = 1; n < 10; n++) {
l = n * k * k;
if (l % s == k) {
printf("%d %lld\n", n, l);
break;
}
}
if (n == 10) printf("No\n");
}
return 0;
}