View Compilation Error

0_0_21800488_31265.cpp:24:9: error: stray '\241' in program
         if(b[i]==‘N‘){
         ^
0_0_21800488_31265.cpp:24:9: error: stray '\256' in program
0_0_21800488_31265.cpp:24:9: error: stray '\241' in program
0_0_21800488_31265.cpp:24:9: error: stray '\256' in program
0_0_21800488_31265.cpp:27:9: error: stray '\241' in program
         }else if(b[i]==‘D‘){
         ^
0_0_21800488_31265.cpp:27:9: error: stray '\256' in program
0_0_21800488_31265.cpp:27:9: error: stray '\241' in program
0_0_21800488_31265.cpp:27:9: error: stray '\256' in program
0_0_21800488_31265.cpp: In function 'bool Solve()':
0_0_21800488_31265.cpp:24:20: error: 'N' was not declared in this scope
         if(b[i]==‘N‘){
                    ^
0_0_21800488_31265.cpp:27:26: error: 'D' was not declared in this scope
         }else if(b[i]==‘D‘){
                          ^