Compilare: user.cpp: In function ‘void solve()’: user.cpp:58:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < t.size();) ^ user.cpp:63:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < t.size() && t[i] == p) ^ user.cpp:76:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < t.size() && t[i] == p) ^ user.cpp: In function ‘void read()’: user.cpp:25:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("praslea.in", "r", stdin); ^ user.cpp:26:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &maxr); ^ user.cpp:29:65: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &v[i].a, &v[i].b, &v[i].F, &v[i].r); ^ user.cpp: In function ‘void write()’: user.cpp:91:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("praslea.out", "w", stdout); ^