View Compilation Error

0_0_39358532_1079.cpp: In function 'long long int solve(long long int)':
0_0_39358532_1079.cpp:54:9: error: 'res' was not declared in this scope
   54 |         res-=dp[0][t][0][0]+dp[0][t][1][0];
      |         ^~~
0_0_39358532_1079.cpp:56:12: error: 'res' was not declared in this scope
   56 |     return res;
      |            ^~~