Compilare: main.cpp: In function 'bool subsir(int, int)': main.cpp:21:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(a[s1]) and j<strlen(a[s2]); ++i) ~^~~~~~~~~~~~~~ main.cpp:21:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(a[s1]) and j<strlen(a[s2]); ++i) ~^~~~~~~~~~~~~~ main.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<strlen(a[s2]) and a[s2][j] != a[s1][i]) ~^~~~~~~~~~~~~~ main.cpp:25:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return i==strlen(a[s1]); ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:36: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] a[i][strlen(a[i])-1] = NULL; ^~~~ main.cpp:30:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d\n", &cerinta,&n); ^ main.cpp:38:35: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(sir, DIM-2, fin); ^ main.cpp:52:36: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(a[i], DIM-2, fin); ^