Compilare: main.cpp: In function 'int main()': main.cpp:21:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < v.size() ; ++ i) { ~~^~~~~~~~~~ main.cpp:22:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = i ; j < v.size() && v[i] == v[j] ; ++ j) ; ~~^~~~~~~~~~ main.cpp:6:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.in", "r", stdin) ; ^ main.cpp:7:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.out", "w", stdout) ; ^ main.cpp:34:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.in", "r", stdin) ; ^