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找1000内素数
Int main(){
int a[1001] = {0};
for(int I = 2;i<=1000;i++){
if(a[i] == 0){
printf("%d\n"ni);
for(int j = i+I; j<=1000; j = j+i){
a[j] = 1;
}}}
Return 0;
}
二分法找峰值
#include<stdio.h>
int feng(int* nums, int n) {
int left = 0;
int right = n - 1;
int mid;
while (left < right) {
mid = (left + right) / 2;
if (nums[mid] >= nums[mid + 1]) {
right = mid;
}
else {
left = mid + 1;
}
}
return left;
}
int main(){
int nums[7] = { 0 };
int n = sizeof(nums) / sizeof(int);
for (int i = 0; i < n ; i++) {
scanf("%d", &nums[i]);
}
int a;
a = feng(nums,n);
printf("%d",a );
return 0;
}
二分法找旋转数组最小值
#include<stdio.h>
int feng(int* nums, int n) {
int left = 0;
int right = n - 1;
int mid;
while (left < right) {
mid = (left + right) / 2;
if (nums[mid] > nums[right]) {
left = mid + 1;
}
else if(nums[mid] < nums[right]){
right = mid;
}
else {
right--;
}
}
return nums[left];
}
int main(){
int nums[5] = { 0 };
int n = sizeof(nums) / sizeof(int);
for (int i = 0; i < n ; i++) {
scanf("%d", &nums[i]);
}
int a;
a = feng(nums,n);
printf("%d",a );
return 0;
}
摩尔投票
int moertoupiao(int* nums,int n) {
int key = nums[0];
int count = 0;
for (int i = 0; i < n; i++) {
if (nums[i] == key) {
count++;
}
else {
count--;
}
if (count <= 0) {
key = nums[i + 1];
}
}
return key;
}
三色旗问题
#include<stdio.h>
void exchange(int* a, int* b) {
int c = *a;
*a = *b;
*b = c;
}
void paixu(int* arr,int a,int b) {
int index = 0;
int i = a - 1;
int j = b + 1;
int temp = 1;
while (index<j) {
if (arr[index]==temp) {
index++;
}
else if(arr[index]<temp){
exchange(&arr[++i],&arr[index]);
index++;
}
else if (arr[index]>temp) {
exchange(&arr[--j],&arr[index]);
}
}
}
int main() {
int arr[] = { 1,2,0,2,2,2,1,1,1,0,0,1,2,0,1,2,0,2,1,0,2,1,2,1 };
int n = sizeof(arr) / sizeof(int);
int i = 0;
paixu(arr,i, n-1);
for (int i = 0; i < n; i++) {
printf("%d ", arr[i]);
}
return 0;
}