Compilare: user.cpp: In function ‘void cb(long long int)’: user.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (need[M]==x || need[M+1]==x || need[M-1]==x) {printf("DA\n"); return;} ^ user.cpp:14:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (need[M]==x || need[M+1]==x || need[M-1]==x) {printf("DA\n"); return;} ^ user.cpp:14:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (need[M]==x || need[M+1]==x || need[M-1]==x) {printf("DA\n"); return;} ^ user.cpp:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (need[M]<x) L=M+1; ^ user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (need[M]>x) R=M-1; ^