「瑞士留学」有做过CMU编程测试的筒子么

有做过CMU编程测试的筒子么

Azero-indexedarrayAconsistingofNintegersisgiven.AnequilibriumindexofthisarrayisanyintegerPsuchthat0≤P<Nandthesumofelementsoflowerindicesisequaltothesumofelementsofhigherindices,i.e.
A[0]+A[1]+...+A[P−1]=A[P+1]+...+A[N−2]+A[N−1]..鐣欏鐢宠璁哄潧-涓€浜╀笁鍒嗗湴
Sumofzeroelementsisassumedtobeequalto0.ThiscanhappenifP=0orifP=N−1.
Forexample,considerthefollowingarrayAconsistingofN=8elements:
A[0]=-1
A[1]=3
A[2]=-4
A[3]=5
A[4]=1
A[5]=-6.鐣欏璁哄潧-涓€浜�-涓夊垎鍦�
A[6]=2
A[7]=1
P=1isanequilibriumindexofthisarray,because:.链枃铡熷垱镊�1point3acres璁哄潧
A[0]=−1=A[2]+A[3]+A[4]+A[5]+A[6]+A[7]
P=3isanequilibriumindexofthisarray,because:
A[0]+A[1]+A[2]=−2=A[4]+A[5]+A[6]+A[7]
P=7isalsoanequilibriumindex,because:
A[0]+A[1]+A[2]+A[3]+A[4]+A[5]+A[6]=0
andtherearenoelementswithindicesgreaterthan7.
P=8isnotanequilibriumindex,becauseitdoesnotfulfillthecondition0≤P<N..1point3acres.com/bbs
Writeafunction:
intsolution(intA[],intN);
that,givenazero-indexedarrayAconsistingofNintegers,returnsanyofitsequilibriumindices.Thefunctionshouldreturn−1ifnoequilibriumindexexists..1point3acres缃�
Forexample,givenarrayAshownabove,thefunctionmayreturn1,3or7,asexplainedabove.
Assumethat:
Nisanintegerwithintherange[0..100,000];
eachelementofarrayAisanintegerwithintherange[−2,147,483,648..2,147,483,647].
Complexity:
expectedworst-casetimecomplexityisO(N);鏉ユ簮涓€浜�.涓夊垎鍦拌鍧�.
expectedworst-casespacecomplexityisO(N),beyondinputstorage(notcountingthestoragerequiredforinputarguments).
Elementsofinputarrayscanbemodified.
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