Compilare: main.cpp: In function 'int main()': main.cpp:127:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ds.size(); ++i){ ~~^~~~~~~~~~~ main.cpp:132:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < qs.size(); ++i){ ~~^~~~~~~~~~~ main.cpp: In function 'void read(int&)': main.cpp:57:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ch, 1, BSIZE, stdin); ^ main.cpp:71:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ch, 1, BSIZE, stdin); ^ main.cpp: In function 'int main()': main.cpp:86:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("obstacole.in", "r", stdin); ^ main.cpp:87:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("obstacole.out", "w", stdout); ^ main.cpp:92:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ch, 1, BSIZE, stdin); ^