View Compilation Error

0_0_1591668_17056.cpp: In function `int main()':
0_0_1591668_17056.cpp:5: error: `multiset' undeclared (first use this function)
0_0_1591668_17056.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1591668_17056.cpp:5: error: expected primary-expression before "int"
0_0_1591668_17056.cpp:5: error: expected `;' before "int"
0_0_1591668_17056.cpp:6: error: expected primary-expression before "int"
0_0_1591668_17056.cpp:6: error: expected `;' before "int"
0_0_1591668_17056.cpp:10: error: `se' undeclared (first use this function)
0_0_1591668_17056.cpp:25: error: `it' undeclared (first use this function)