1002 数组

1.数组初始化 2.保留小数

#include<iostream> #include<iomanip> using namespace std; int main() { int m, n; float a[1001] = { 0.0 }; float coe; int exp; cin >> m; for (int i = 0;i < m;i++) { cin >> exp >> coe; a[exp] += coe; } cin >> n; for (int i = 0;i < n;i++) { cin >> exp >> coe; a[exp] += coe; } int res = 0; for (int i = 0;i < 1001;i++) { if (a[i] != 0.0) res++; } cout << res; for (int i = 1000;i >= 0;i--) { if (a[i] != 0.0) cout << " " << i << " " << setprecision(1) << std::fixed << a[i]; } return 0; }