#include <iostream>
int main() {
int sum = 0;
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10; j++) {
sum += (i * 10) + j;
}
}
std::cout << "Tong tu 1 den 100 la: " << sum << std::endl;
return 0;
}
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