承压金字塔（蓝桥杯17C）

文件读取，与写入：C++ 文件和流 | 菜鸟教程

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
double sum[30][30];
int main() {ifstream infile("C:\\Users\\xutianci\\OneDrive\\Desktop\\TMOCC\\p4\\Business_Caculate\\jinzita.txt"); // 使用ifstream打开文件if (!infile.is_open()) {cerr << "无法打开文件 jinzita.txt" << endl;return 1; // 如果文件打开失败，退出程序}string line;int i = 0,j;while (getline(infile, line)) { // 从文件中逐行读取for (j = 0; j < line.length();j++) {sum[i][j] = double(line[j]-'0');sum[i][j] *= pow(2,29);if (i != 0) {if (j == 0) {sum[i][j] += sum[i - 1][j] / 2;}else if (j == line.length()-1) {sum[i][j] += sum[i - 1][j - 1]/2;}else {sum[i][j] += sum[i - 1][j] / 2+sum[i - 1][j - 1]/2;}}}i++;}double max = 0;for (int z = 0; z <= j;z++) {sum[i][z] = 0;if (z == 0) {sum[i][z] += sum[i - 1][z] / 2;}else if (j == z) {sum[i][z] += sum[i - 1][z - 1] / 2;}else {sum[i][z] += sum[i - 1][z] / 2 + sum[i - 1][z - 1] / 2;}if (max<sum[i][z]) {max = sum[i][z];}}max /= pow(2,29);cout << double(max);infile.close(); // 关闭文件return 0;
}