Compilare: main.cpp: In function 'int main()': main.cpp:85:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(a==1<<30); ^~ main.cpp:86:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' a=-1; ^ main.cpp:69:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d ",&t,&n,&d); ^ main.cpp:71:19: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,N,fin); ^