Compilare: main.cpp: In function 'int find(std::vector<int>&, int)': main.cpp:29:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;p<v.size();p<<=1); ~^~~~~~~~~ main.cpp:31:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st + p < v.size() && v[st+p] < x) st += p; ~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x < v[c].size() && v[c][x] == a){ ~~^~~~~~~~~~~~~ main.cpp:70:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dr < v[c].size() && v[c][dr] <= b) dr++; ~~~^~~~~~~~~~~~~ main.cpp:39:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("marbles.in","r",stdin); ^ main.cpp:40:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("marbles.out","w",stdout); ^ main.cpp:42:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:44:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &pos, &c); ^ main.cpp:51:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &t, &a, &b); ^