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#include <tuple>
#include <vector>
#include <algorithm>
bool operator < (std::pair<int, int>, std::pair<int, int>) {
throw 0;
}
int main() {
std::vector<std::pair<int, int>> v = {
{ 0, 0 },
{ 1, 1 }
};
std::sort(v.begin(), v.end());
//v[0] < v[1];
}
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