Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[x].size(); ++i) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < r[x].size(); ++i) ^ user.cpp: In function ‘void conex()’: user.cpp:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < CTC.size(); ++i) ^ user.cpp:41:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < CTC[i].size(); ++j) ^ user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < r[i].size(); ++j) ^ user.cpp: In function ‘void dfsc(int, int)’: user.cpp:61:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[x].size(); ++i) ^ user.cpp: In function ‘bool match(int)’: user.cpp:70:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < bp[x].size(); ++i) ^ user.cpp:76:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < bp[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:104:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ins.size(); ++i){ ^ user.cpp:113:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ins.size(); ++i) ^ user.cpp:118:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ins.size(); ++i) ^ user.cpp:124:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cpls.size(); ++i) ^ user.cpp:125:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < cpls.size() - 1) ^ user.cpp:129:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ins.size(); ++i) ^ user.cpp:130:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(!usedi[ins[i]])