View Compilation Error

0_0_22227325_9676.cpp: In function 'int main()':
0_0_22227325_9676.cpp:18:20: error: expected primary-expression before ';' token
          for(int i=;i<=n;i++){
                    ^
0_0_22227325_9676.cpp:20:29: error: expected primary-expression before ']' token
              cost[i]=cost[i-]+a[i];
                             ^
0_0_22227325_9676.cpp:22:20: error: expected primary-expression before ';' token
          for(int i=;i<=n;i++)dp[i]=inf;
                    ^
0_0_22227325_9676.cpp:24:20: error: expected primary-expression before ';' token
          for(int i=;i<=n;i++){
                    ^
0_0_22227325_9676.cpp:26:57: error: expected primary-expression before ')' token
                  dp[i]=min(dp[i],dp[j]+(cost[i]-cost[j]+)*b[i]);
                                                         ^