C++ problem

what to sort the data by population and the data is below

State Capital Population

New Hampshire Concord 1,238,415

Ohio Columbus 11,374,540

Kansas Topeka 2,693,824

Louisiana Baton Rouge 4,480,271

Michigan Lansing 9,955,829

Florida Talahasse 16,028,890

Connecticut Hartford 3,409,535

Iowa Des Moines 2,931,923

West Virginia Charleston 1,813,077

Missouri Jefferson 5,606,260

Wyoming Cheyenne 495,304

California Sacramento 33,930,798

Alabama Montgomery 4,461,130

New Jersey Trenton 8,424,354

South Dakota Pierre 756,874

Maryland Annapolis 5,307,886

Indiana Indianapolis 6,090,782

Oklahoma Oklahoma City 3,458,819

North Carolina Raleigh 8,067,673

New York Albany 19,004,973

California Sacramento 33,930,798

Alabama Montgomery 4,461,130

New Jersey Trenton 8,424,354

South Dakota Pierre 756,874

Maryland Annapolis 5,307,886

Indiana Indianapolis 6,090,782

Oklahoma Oklahoma City 3,458,819

North Carolina Raleigh 8,067,673

New York Albany 19,004,973

Rhode Island Providence 1,049,662

Massachusetts Boston 6,355,568

Texas Austin 20,903,994

Kentucky Frankfort 4,049,431

Alaska Juneau 628,933

Utah Salt Lake City 2,236,714

Nevada Carson City 2,002,032

Maine Augusta 1,277,731

Tennessee Nashville 5,700,037

New Mexico Santa Fe 1,823,821

Oregon Salem 3,428,543

Minnesota St. Paul 4,925,670

Wisconsin Madison 5,371,210

Pennsylvania Harrisburg 12,300,670