Compilare: user.cpp: In function ‘bool chk(int)’: user.cpp:19:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(sz[t[i]] < cnt[p + 1][t[i]] + r) { ^ user.cpp:19:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(sz[t[i]] < cnt[p + 1][t[i]] + r) { ^ user.cpp:22:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] p = pos[t[i]][cnt[p + 1][t[i]] + r - 1]; ^ user.cpp:22:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] p = pos[t[i]][cnt[p + 1][t[i]] + r - 1]; ^ user.cpp: In function ‘int main()’: user.cpp:41:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[s[i]][sz[s[i]]++] = i; ^ user.cpp:41:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[s[i]][sz[s[i]]++] = i; ^ user.cpp:46:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] cnt[i][s[i - 1]]++; ^ user.cpp:28:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("balbaiala.in", "r", stdin); ^ user.cpp:29:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("balbaiala.out", "w", stdout); ^ user.cpp:31:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &q); ^ user.cpp:33:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, maxn, stdin); ^ user.cpp:49:30: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(t, maxn, stdin); ^