Compilare: user.cpp: In function ‘bool check(int)’: user.cpp:13:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, B, A, pos, iA, lim; ^ user.cpp: In function ‘void buildSol(int)’: user.cpp:63:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < lastInd[pos].size(); ++ i) { ^ user.cpp: In function ‘int main()’: user.cpp:101:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lapte.in", "r", stdin); ^ user.cpp:102:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lapte.out", "w", stdout); ^ user.cpp:105:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &l); ^ user.cpp:107:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a[i], &b[i]); ^ user.cpp: In function ‘int bs(int)’: user.cpp:97:12: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^