程序设计竞赛入门

#include <iostream>#include <cstdio>#include <cstring>#include <vector>#define ARRSIZE(x) (sizeof(x)/sizeof(x[0]))using namespace std;// 请读者只在下面的函数内修改代码int summary(vector<vector<int> >& mat) {    int sum = 0;    for (int i = 0; i < mat.size(); ++i)        for (int j = 0; j < mat[0].size(); ++j)            sum += mat[i][j];    return sum;}// 请读者不要修改下面的主函数int main() {  int numa[] = {1, 2, 3};  vector<int> a(numa, numa + ARRSIZE(numa));  int numb[] = {4, 5, 6};  vector<int> b(numb, numb + ARRSIZE(numb));  vector<vector<int> > mat;  mat.push_back(a);  mat.push_back(b);  printf("%d\n", summary(mat));  return 0;}