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Fractional knapsack

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	`1`	`+#include <bits/stdc++.h>`
	`2`	`+#define ll long long`
	`3`	`+#define pll pair<ll,ll>`
	`4`	`+using namespace std;`
	`5`	`+`
	`6`	`+bool comp(pll a, pll b) {`
	`7`	`+ float ratio1 = float(a.first)/float(a.second);`
	`8`	`+ float ratio2 = float(b.first)/float(b.second);`
	`9`	`+ return ratio1 > ratio2;`
	`10`	`+}`
	`11`	`+`
	`12`	`+int main() {`
	`13`	`+ ll i,value,weight,n,w;`
	`14`	`+ cin>>n>>w;`
	`15`	`+ vector<pll > ratio;`
	`16`	`+ for(i=0;i<n;i++) {`
	`17`	`+ cin>>value>>weight;`
	`18`	`+ ratio.push_back(make_pair(value,weight));`
	`19`	`+ }`
	`20`	`+ sort(ratio.begin(), ratio.end(), comp);`
	`21`	`+ float res = 0.0;`
	`22`	`+ i = 0;`
	`23`	`+ while(i<n && w-ratio[i].second >= 0) {`
	`24`	`+ res += ratio[i].first;`
	`25`	`+ w -= ratio[i].second;`
	`26`	`+ i++;`
	`27`	`+ }`
	`28`	`+ if(i<n) {`
	`29`	`+ res += (float(ratio[i].first)/float(ratio[i].second))*w;`
	`30`	`+ }`
	`31`	`+ cout<<res<<endl;`
	`32`	`+ return 0;`
	`33`	`+}`

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