Compilare: In file included from /usr/include/c++/4.8/cassert:43:0, from user.cpp:4: user.cpp: In function ‘int main()’: user.cpp:122:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(i < power_base.size()); ^ user.cpp:128:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(i < aib0.size()); ^ user.cpp:136:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(pos < final_line.size()); ^ user.cpp:143:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(j < final_line.size()); ^ user.cpp:157:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(i < aib1.size()); ^ user.cpp:174:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(st1 < final_line.size()); ^ user.cpp:175:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(st2 < final_line.size()); ^ user.cpp: In function ‘void UpdateHashSegmentTree(int, int, int, int)’: user.cpp:226:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < node && node < seg_tree.size()); ^ user.cpp:227:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < st && st < final_line.size()); ^ user.cpp:228:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < en && st < en && en < final_line.size()); ^ user.cpp: In function ‘void BuildSegmentTree(int, int, int)’: user.cpp:249:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < node && node < seg_tree.size()); ^ user.cpp:250:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < st && st < final_line.size()); ^ user.cpp:251:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < en && en < final_line.size()); ^ user.cpp:256:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < st && st < final_line.size()); ^ user.cpp:257:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(0 < en && st < en && en < final_line.size()); ^