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Codeforces_Dragons.cpp
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62 lines (35 loc) · 930 Bytes
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#include <bits/stdc++.h>
using namespace std;
typedef struct {
long long stOfDrag, bonOfHero;
} drag;
bool cmp(drag cA, drag cB) {
return cA.stOfDrag < cB.stOfDrag;
}
int main() {
long long sOfhero, nOfdrag;
cin >> sOfhero >> nOfdrag;
vector < drag > listOfdrag;
for(long long i = 0; i < nOfdrag; i++) {
drag sinDrag;
cin >> sinDrag.stOfDrag >> sinDrag.bonOfHero;
listOfdrag.push_back(sinDrag);
}
sort(listOfdrag.begin(), listOfdrag.end(), cmp);
for(long long i = 0; i < listOfdrag.size(); i++) {
if(listOfdrag[i].stOfDrag < sOfhero) {
sOfhero += listOfdrag[i].bonOfHero;
}
else {
sOfhero = 0;
break;
}
}
if(sOfhero > 0) {
cout << "YES" << endl;
}
else {
cout << "NO" << endl;
}
return 0;
}