我试图在这个2D矢量变量中插入一个元素,但我不知道如何使用这个奇怪的矢量类型
void CaesarCypher::caesarAttack(string inputFileName, string frequencyFileName, string outputFileName, string phiFile)
{
vector<pair<char, double>> cipherTable = charFreqGen(inputFileName, outputFileName, numberDisplayed);
vector<pair<char, double>> frequencyTable = charFreqGen(frequencyFileName, outputFileName, 150);
vector<pair<int, double>> phiTable;
for (int i = 0; i <= 94; i++)
{
double phi = 0.0;
for (const auto& p : cipherTable)
{
char key = (char) ((int) p.first - i);
auto find_it = find(frequencyTable.begin(), frequencyTable.end(), [key](const pair<char, double>& x) { return x.first == key; });
double value;
if (find_it != frequencyTable.end())
{
value = find_it->second;
}
phi += p.second * value;
//Insert a new element into the phiTable with the int parameter being i and the double paramter being phi
}
}
}
我要插入的地方是用注释指定的。我希望i值进入对的整数部分,phi值进入双部分
答案 0 :(得分:2)
要创建std::pair
,您可以使用std::make_pair()
,在这种情况下,类型将自动推断出来:
phiTable.push_back(std::make_pair(i, phi));
或者您可以自己指定类型:
phiTable.push_back(std::pair<int,double>(i, phi));
答案 1 :(得分:1)
pair<int, double> t(i, phi);
phiTable.push_back(t);
或者
phiTable.push_back(std::make_pair<int, double>(i, phi));