Compilare: user.cpp: In function ‘void furt()’: user.cpp:66:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int msk = 1 << 20; msk; msk>>= 1) if(msk < lgs.size()) { ^ user.cpp:72:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lgs.size(); ++i) { ^ user.cpp:76:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lgs.size(); ++i) { ^ user.cpp:77:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; l < edg.size() && edg[l].cst >= lgs[i]; ++l) ^ user.cpp: In function ‘void isag()’: user.cpp:89:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lgs.size() - 1; ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:98:10: warning: unused variable ‘a’ [-Wunused-variable] int q, a, b, cst; ^ user.cpp:98:13: warning: unused variable ‘b’ [-Wunused-variable] int q, a, b, cst; ^ user.cpp:98:16: warning: unused variable ‘cst’ [-Wunused-variable] int q, a, b, cst; ^ user.cpp: In function ‘char nextch()’: user.cpp:31:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buck, 1, BMAX, stdin); } ^ user.cpp: In function ‘int main()’: user.cpp:96:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luff.in", "r", stdin); ^ user.cpp:97:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luff.out", "w", stdout); ^